{
  "version": 1,
  "updatedAt": "2026-10-17",
  "coordinateConvention": "Overview markers use degrees of latitude and east-positive longitude normalized to −180…180. Latitude follows each cited source; control-network and longitude conversions are recorded per point. Giant-planet regions use null longitude and do not locate current clouds.",
  "bodies": [
    {
      "id": "mercury",
      "name": "Mercury",
      "category": "rocky",
      "description": "A heavily cratered inner world with a large metallic core and an extremely thin exosphere.",
      "mapping": {
        "kind": "surface",
        "note": "Spacecraft surface mosaic; geography is a reference map, not a current image.",
        "sourceUrls": [
          "https://science.nasa.gov/mercury/facts/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Near-vacuum: extreme day/night heating and polar cold traps. No atmospheric wind or precipitation feed.",
        "sourceUrls": [
          "https://science.nasa.gov/mercury/facts/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "2,439.7 km",
          "semantics": "reference",
          "context": "Volumetric mean radius.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/mercuryfact.html"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity",
          "value": "3.70 m/s²",
          "semantics": "reference",
          "context": "Reference mean surface gravity.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/mercuryfact.html"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "1,407.6 h",
          "semantics": "reference",
          "context": "Sidereal rotation relative to the stars.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/mercuryfact.html"
          ]
        },
        {
          "id": "solar-day",
          "label": "Solar day",
          "value": "4,222.6 h",
          "semantics": "reference",
          "context": "Reference noon-to-noon period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/mercuryfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit",
          "value": "87.969 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the Sun; Earth days.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/mercuryfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Surface-bound exosphere",
          "semantics": "reference",
          "context": "Sparse atoms; not a dense, weather-bearing atmosphere.",
          "sourceUrls": [
            "https://science.nasa.gov/mercury/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Surface temperatures",
          "value": "~−180 to +430 °C",
          "semantics": "typical",
          "context": "Night/day extremes, not a global instantaneous temperature.",
          "sourceUrls": [
            "https://science.nasa.gov/mercury/facts/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure",
          "value": "Below ~5 × 10⁻¹⁵ bar",
          "semantics": "typical",
          "context": "Reference upper estimate for a variable exosphere.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/mercuryfact.html"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Not applicable",
          "semantics": "reference",
          "context": "No collisional atmosphere to support ordinary weather winds; solar wind is a different phenomenon.",
          "sourceUrls": [
            "https://science.nasa.gov/mercury/facts/"
          ]
        }
      ],
      "points": [
        {
          "id": "caloris",
          "name": "Caloris Planitia",
          "kind": "surface-feature",
          "latitude": 31.65,
          "longitude": 161.98,
          "description": "A huge impact basin surrounded by rugged terrain.",
          "whyInteresting": "Its basin and plains preserve a record of major impacts and resurfacing.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/979",
            "https://science.nasa.gov/mercury/facts/"
          ],
          "coordinateNotes": "USGS MESSENGER Team center: 31.65° planetographic latitude, 198.02° west longitude; converted to 161.98° east."
        },
        {
          "id": "rembrandt",
          "name": "Rembrandt basin",
          "kind": "surface-feature",
          "latitude": -32.89,
          "longitude": 87.87,
          "description": "A large, named impact basin in the southern hemisphere.",
          "whyInteresting": "Compare this southern-hemisphere basin with northern Caloris.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14563"
          ],
          "coordinateNotes": "USGS MESSENGER Team center: −32.89° planetographic latitude, 272.13° west; converted to 87.87° east."
        },
        {
          "id": "polar-cold-traps",
          "name": "North polar cold traps",
          "kind": "pole",
          "latitude": 90,
          "longitude": null,
          "description": "Permanently shadowed polar craters can preserve water ice.",
          "whyInteresting": "A hot planet can retain ice where sunlight never reaches the crater floors.",
          "sourceUrls": [
            "https://science.nasa.gov/mercury/facts/"
          ],
          "coordinateNotes": "Geometric pole identifies the region; individual ice deposits are not positioned at 90° latitude."
        }
      ]
    },
    {
      "id": "venus",
      "name": "Venus",
      "category": "rocky",
      "description": "A rocky world beneath thick clouds, with intense greenhouse heating and vast volcanic landscapes.",
      "mapping": {
        "kind": "radar-surface",
        "note": "Radar-derived false-color surface geography. Visible-light clouds hide the terrain; this is not an optical or live weather map.",
        "sourceUrls": [
          "https://science.nasa.gov/venus/facts/"
        ]
      },
      "weather": {
        "mode": "climatology",
        "summary": "Reference climate only: dense carbon dioxide, sulfuric-acid clouds and slow surface winds. No live planetary weather feed.",
        "sourceUrls": [
          "https://science.nasa.gov/venus/facts/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "6,051.8 km",
          "semantics": "reference",
          "context": "Volumetric mean radius.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity",
          "value": "8.87 m/s²",
          "semantics": "reference",
          "context": "Reference mean surface gravity.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "5,832.6 h · retrograde",
          "semantics": "reference",
          "context": "Sidereal spin is retrograde; a solar day is shorter than a rotation.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html"
          ]
        },
        {
          "id": "solar-day",
          "label": "Solar day",
          "value": "2,802.0 h",
          "semantics": "reference",
          "context": "Reference noon-to-noon period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit",
          "value": "224.701 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the Sun; Earth days.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "~96.5% CO₂; ~3.5% N₂",
          "semantics": "typical",
          "context": "Near-surface composition by volume.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html"
          ]
        },
        {
          "id": "temperature",
          "label": "Surface temperature",
          "value": "737 K (~464 °C)",
          "semantics": "typical",
          "context": "Reference average; not a current sensor reading.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface pressure",
          "value": "~92 bar",
          "semantics": "typical",
          "context": "Reference near-surface atmospheric pressure.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html"
          ]
        },
        {
          "id": "winds",
          "label": "Surface winds",
          "value": "~0.3–1.0 m/s",
          "semantics": "typical",
          "context": "Reference surface range; higher cloud-level circulation differs.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html"
          ]
        }
      ],
      "points": [
        {
          "id": "maxwell",
          "name": "Maxwell Montes",
          "kind": "surface-feature",
          "latitude": 65.2,
          "longitude": 3.3,
          "description": "A major mountain massif within the northern highlands.",
          "whyInteresting": "Radar mapping reveals relief hidden beneath the clouds.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3766"
          ],
          "coordinateNotes": "USGS center, planetocentric latitude and east-positive longitude."
        },
        {
          "id": "maat",
          "name": "Maat Mons",
          "kind": "surface-feature",
          "latitude": 0.5,
          "longitude": -165.4,
          "description": "A prominent volcanic mountain on Venus.",
          "whyInteresting": "A useful landmark for exploring Venusian volcanic terrain.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3550"
          ],
          "coordinateNotes": "USGS center: 0.50° N, 194.60° E; longitude normalized to −165.40°."
        },
        {
          "id": "aphrodite",
          "name": "Aphrodite Terra",
          "kind": "surface-feature",
          "latitude": -5.8,
          "longitude": 104.8,
          "description": "A broad equatorial highland region.",
          "whyInteresting": "Its enormous, complex terrain offers a contrast to isolated volcanic mountains.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/317"
          ],
          "coordinateNotes": "USGS center, planetocentric latitude and east-positive longitude."
        }
      ]
    },
    {
      "id": "earth",
      "name": "Earth",
      "category": "rocky",
      "description": "An ocean-covered rocky planet with an active atmosphere, plate tectonics and abundant surface liquid water.",
      "mapping": {
        "kind": "surface",
        "note": "Reference surface geography beneath the existing time-stamped cloud, radar, precipitation and modeled wind layers.",
        "sourceUrls": [
          "https://science.nasa.gov/earth/facts/"
        ]
      },
      "weather": {
        "mode": "earth-live",
        "summary": "Earth retains the existing observations and NOAA GFS wind layers. Their own timestamps identify observation and model valid times. Atlas facts are reference values.",
        "sourceUrls": [
          "https://science.nasa.gov/earth/facts/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "6,371.0 km",
          "semantics": "reference",
          "context": "Volumetric mean radius.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity",
          "value": "9.82 m/s²",
          "semantics": "reference",
          "context": "Reference mean surface gravity.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "23.9345 h",
          "semantics": "reference",
          "context": "Sidereal rotation relative to the stars.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html"
          ]
        },
        {
          "id": "solar-day",
          "label": "Solar day",
          "value": "24.0000 h",
          "semantics": "reference",
          "context": "Reference noon-to-noon period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit",
          "value": "365.256 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the Sun; Earth days.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Dry atmosphere",
          "value": "~78% N₂; ~21% O₂",
          "semantics": "typical",
          "context": "Water vapor varies strongly with place and weather.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html"
          ]
        },
        {
          "id": "temperature",
          "label": "Reference temperature",
          "value": "288 K (~15 °C)",
          "semantics": "typical",
          "context": "Fact-sheet reference average, not today’s global temperature.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface pressure",
          "value": "~1,014 hPa",
          "semantics": "typical",
          "context": "Fact-sheet reference; local pressure varies with elevation and weather.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html"
          ]
        },
        {
          "id": "winds",
          "label": "Wind layers",
          "value": "10 m AGL to 250 hPa",
          "semantics": "model",
          "context": "Existing time-stamped GFS modeled fields; pressure-level heights are approximate.",
          "sourceUrls": [
            "https://registry.opendata.aws/noaa-gfs-bdp-pds/"
          ]
        }
      ],
      "points": [
        {
          "id": "mauna-loa",
          "name": "Mauna Loa",
          "kind": "surface-feature",
          "latitude": 19.475,
          "longitude": -155.608,
          "description": "A vast basaltic shield volcano on Hawaiʻi.",
          "whyInteresting": "Its broad shield provides a terrestrial comparison with giant volcanoes on Mars.",
          "sourceUrls": [
            "https://www.usgs.gov/volcanoes/mauna-loa",
            "https://volcanoes.usgs.gov/vsc/api/volcanoApi/volcanoesUS"
          ],
          "coordinateNotes": "USGS Volcano Hazards Program reference location; geographic east-positive coordinates."
        },
        {
          "id": "yellowstone",
          "name": "Yellowstone caldera",
          "kind": "surface-feature",
          "latitude": 44.615,
          "longitude": -110.6,
          "description": "A large caldera and hydrothermal region in the western United States.",
          "whyInteresting": "Geysers and hot springs connect surface water with heat from Earth’s interior.",
          "sourceUrls": [
            "https://www.usgs.gov/volcanoes/yellowstone/",
            "https://volcanoes.usgs.gov/vsc/api/volcanoApi/volcanoesUS"
          ],
          "coordinateNotes": "USGS Volcano Hazards Program reference location; geographic east-positive coordinates."
        },
        {
          "id": "st-helens",
          "name": "Mount St. Helens",
          "kind": "surface-feature",
          "latitude": 46.2,
          "longitude": -122.18,
          "description": "A Cascade volcano with a prominent crater.",
          "whyInteresting": "Its landscape provides a comparison with impact craters and volcanic landforms elsewhere.",
          "sourceUrls": [
            "https://www.usgs.gov/maps/rebuilding-mount-st-helens",
            "https://volcanoes.usgs.gov/vsc/api/volcanoApi/volcanoesUS"
          ],
          "coordinateNotes": "USGS Volcano Hazards Program reference location; geographic east-positive coordinates."
        }
      ]
    },
    {
      "id": "moon",
      "name": "Moon",
      "category": "moon",
      "description": "Earth’s rocky natural satellite records impacts, ancient volcanism and the history of human lunar exploration.",
      "mapping": {
        "kind": "surface",
        "note": "Reference lunar surface mosaic. Landing markers are historical sites; they do not track moving spacecraft.",
        "sourceUrls": [
          "https://science.nasa.gov/moon/facts/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Near-vacuum with a tenuous exosphere: no ordinary atmospheric winds or rain. Sunlit and shadowed terrain can differ greatly in temperature.",
        "sourceUrls": [
          "https://science.nasa.gov/moon/facts/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "1,737.4 km",
          "semantics": "reference",
          "context": "Volumetric mean radius.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity",
          "value": "1.62 m/s²",
          "semantics": "reference",
          "context": "Reference mean surface gravity.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "655.720 h",
          "semantics": "reference",
          "context": "Synchronous sidereal rotation: nearly the same hemisphere faces Earth.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html"
          ]
        },
        {
          "id": "solar-day",
          "label": "Solar day",
          "value": "29.53 Earth days",
          "semantics": "reference",
          "context": "Reference noon-to-noon period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit",
          "value": "27.3217 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around Earth, not a year around the Sun.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Extremely tenuous exosphere",
          "semantics": "reference",
          "context": "Not a weather-bearing atmosphere.",
          "sourceUrls": [
            "https://science.nasa.gov/moon/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Equatorial surface range",
          "value": "~95–390 K",
          "semantics": "typical",
          "context": "Reference diurnal range; permanently shadowed polar terrain differs.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html"
          ]
        },
        {
          "id": "pressure",
          "label": "Nighttime pressure",
          "value": "~3 × 10⁻¹⁵ bar",
          "semantics": "typical",
          "context": "Very small, variable exospheric pressure; a reference estimate.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Not applicable",
          "semantics": "reference",
          "context": "Solar-wind particles are not atmospheric wind.",
          "sourceUrls": [
            "https://science.nasa.gov/moon/facts/"
          ]
        }
      ],
      "points": [
        {
          "id": "apollo-11",
          "name": "Apollo 11 · Tranquility Base",
          "kind": "historical-landing",
          "latitude": 0.67416,
          "longitude": 23.47314,
          "description": "Historical landing site of the Eagle lunar module on 20 July 1969.",
          "whyInteresting": "The first human lunar landing connects an identifiable site with the Apollo record.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/lunar/lunar_sites.html",
            "https://www.nasa.gov/missions/apollo/apollo-11-mission-overview/"
          ],
          "coordinateNotes": "NASA NSSDCA lunar-module coordinates; historical site, not a live spacecraft location.",
          "date": "1969-07-20"
        },
        {
          "id": "tycho",
          "name": "Tycho crater",
          "kind": "surface-feature",
          "latitude": -43.3,
          "longitude": -11.22,
          "description": "A prominent southern lunar impact crater.",
          "whyInteresting": "Its bright ray system makes it an accessible landmark for connecting globe and sky views.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6163",
            "https://science.nasa.gov/resource/tycho-crater-on-the-moon-labeled/"
          ],
          "coordinateNotes": "USGS LOLA 2011 center; planetographic latitude, east-positive longitude."
        },
        {
          "id": "shackleton",
          "name": "Shackleton crater",
          "kind": "surface-feature",
          "latitude": -89.67,
          "longitude": 129.78,
          "description": "An impact crater close to the lunar south pole.",
          "whyInteresting": "Its polar setting highlights the contrast between illuminated terrain and permanent shadow.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/5450",
            "https://science.nasa.gov/moon/facts/"
          ],
          "coordinateNotes": "USGS LOLA 2011 center; planetographic latitude, east-positive longitude."
        }
      ]
    },
    {
      "id": "mars",
      "name": "Mars",
      "category": "rocky",
      "description": "A cold desert world with giant volcanoes, immense canyons and evidence of ancient lakes and rivers.",
      "mapping": {
        "kind": "surface",
        "note": "Reference spacecraft surface mosaic with fixed geological feature centers. These are not current rover positions.",
        "sourceUrls": [
          "https://science.nasa.gov/mars/facts/"
        ]
      },
      "weather": {
        "mode": "climatology",
        "summary": "Reference climate and historical measurements only: thin carbon dioxide air, dust storms and large temperature swings. No live Mars weather feed.",
        "sourceUrls": [
          "https://science.nasa.gov/mars/facts/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "3,389.5 km",
          "semantics": "reference",
          "context": "Volumetric mean radius.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity",
          "value": "3.73 m/s²",
          "semantics": "reference",
          "context": "Reference mean surface gravity.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "24.6229 h",
          "semantics": "reference",
          "context": "Sidereal rotation relative to the stars.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "solar-day",
          "label": "Solar day",
          "value": "24.6597 h · 1 sol",
          "semantics": "reference",
          "context": "Reference noon-to-noon period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit",
          "value": "686.980 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the Sun; Earth days.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "~95% CO₂",
          "semantics": "typical",
          "context": "Thin atmosphere with nitrogen and argon.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "temperature",
          "label": "Reference temperature",
          "value": "~214 K (~−59 °C)",
          "semantics": "typical",
          "context": "Compiled average; local daytime, nighttime and seasonal values differ.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "pressure",
          "label": "Mean-radius pressure",
          "value": "~6.36 hPa",
          "semantics": "typical",
          "context": "Reference value; fact-sheet seasonal range ~4.0–8.7 hPa.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "winds",
          "label": "Viking-site winds",
          "value": "~2–10 m/s; storms ~17–30 m/s",
          "semantics": "historical",
          "context": "Historical Viking lander-site ranges, not current or globally uniform winds.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        }
      ],
      "points": [
        {
          "id": "olympus",
          "name": "Olympus Mons",
          "kind": "surface-feature",
          "latitude": 18.65,
          "longitude": -133.8,
          "description": "An enormous shield volcano in the Tharsis region.",
          "whyInteresting": "Compare its broad volcanic edifice with Earth’s shield volcanoes.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/4453",
            "https://science.nasa.gov/mars/facts/"
          ],
          "coordinateNotes": "USGS MDIM 2.1 planetocentric center: 18.65° N, 226.20° E; longitude normalized."
        },
        {
          "id": "valles",
          "name": "Valles Marineris",
          "kind": "surface-feature",
          "latitude": -14.01,
          "longitude": -58.59,
          "description": "A vast canyon system across the equatorial region.",
          "whyInteresting": "Its scale and tectonic setting contrast with smaller terrestrial canyon systems.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6288",
            "https://science.nasa.gov/mars/facts/"
          ],
          "coordinateNotes": "USGS MDIM 2.1 planetocentric center: −14.01°, 301.41° E; longitude normalized."
        },
        {
          "id": "jezero",
          "name": "Jezero crater",
          "kind": "surface-feature",
          "latitude": 18.41,
          "longitude": 77.69,
          "description": "An impact crater containing evidence of an ancient lake and river delta.",
          "whyInteresting": "A geological target for studying past habitable environments; this marker is the crater center.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14300",
            "https://science.nasa.gov/mission/mars-2020-perseverance/"
          ],
          "coordinateNotes": "USGS MDIM 2.1 planetocentric crater center; not Perseverance’s current location."
        }
      ]
    },
    {
      "id": "jupiter",
      "name": "Jupiter",
      "category": "gas-giant",
      "description": "A giant hydrogen-helium world with powerful jets, long-lived storms and polar cyclones.",
      "mapping": {
        "kind": "cloud-deck",
        "note": "Illustrative cloud-deck globe, not a solid-surface or live weather map. Atmospheric regions have no fixed longitude.",
        "sourceUrls": [
          "https://science.nasa.gov/jupiter/facts/"
        ]
      },
      "weather": {
        "mode": "climatology",
        "summary": "Measured and reference atmosphere information only. Cloud features drift; regional markers do not report current storm positions.",
        "sourceUrls": [
          "https://science.nasa.gov/jupiter/facts/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "69,911 km",
          "semantics": "reference",
          "context": "Volumetric mean radius; atmospheric reference figure, not a solid surface.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity",
          "value": "25.92 m/s²",
          "semantics": "reference",
          "context": "Mean gravity at the 1-bar reference level; no solid surface.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "9.9250 h",
          "semantics": "reference",
          "context": "System III reference rotation; atmospheric features have differential rotation.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html"
          ]
        },
        {
          "id": "solar-day",
          "label": "Solar day",
          "value": "9.9259 h",
          "semantics": "reference",
          "context": "Reference noon-to-noon period; atmospheric clouds rotate at different rates.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit",
          "value": "4,332.589 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the Sun; Earth days.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Mostly H₂ and helium",
          "semantics": "typical",
          "context": "Ammonia and water clouds form within a deep atmosphere.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "At 1 bar",
          "value": "165 K (~−108 °C)",
          "semantics": "typical",
          "context": "Reference atmospheric temperature at a specified pressure, not a ground temperature.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "1 bar = 100 kPa",
          "semantics": "reference",
          "context": "An atmospheric reference level; Jupiter has no solid surface.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html",
            "https://science.nasa.gov/jupiter/facts/"
          ]
        },
        {
          "id": "winds",
          "label": "Low-latitude winds",
          "value": "Up to ~150 m/s",
          "semantics": "measured",
          "context": "Compiled cloud-level range within 30° of the equator, not a current global field.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html"
          ]
        }
      ],
      "points": [
        {
          "id": "great-red-spot-band",
          "name": "Great Red Spot latitude band",
          "kind": "latitude-band",
          "latitude": -22,
          "longitude": null,
          "description": "A southern atmospheric band associated with the Great Red Spot.",
          "whyInteresting": "Explore the storm’s latitude without inventing a fixed or current longitude.",
          "sourceUrls": [
            "https://www.nasa.gov/sites/default/files/atoms/files/hubblefocusouramazingsolarsystem.pdf",
            "https://science.nasa.gov/jupiter/facts/"
          ],
          "coordinateNotes": "Approximately 22° south in NASA’s overview; a regional band, not a live storm fix."
        },
        {
          "id": "north-cyclones",
          "name": "North polar cyclones",
          "kind": "pole",
          "latitude": 90,
          "longitude": null,
          "description": "Juno observations revealed a central cyclone surrounded by other large cyclones.",
          "whyInteresting": "Polar views reveal atmospheric structures hidden in equatorial views.",
          "sourceUrls": [
            "https://science.nasa.gov/asset/webb/jupiters-polar-cyclone-storms-juno/"
          ],
          "coordinateNotes": "Geometric north pole denotes the observed region, not individual cyclone centers."
        },
        {
          "id": "south-cyclones",
          "name": "South polar cyclones",
          "kind": "pole",
          "latitude": -90,
          "longitude": null,
          "description": "Juno imaged a southern polar region crowded with cyclonic storms.",
          "whyInteresting": "Compare the organization of storms at Jupiter’s opposite poles.",
          "sourceUrls": [
            "https://www.nasa.gov/news-release/a-whole-new-jupiter-first-science-results-from-nasas-juno-mission/"
          ],
          "coordinateNotes": "Regional south-pole marker; no present-day cyclone locations are asserted."
        },
        {
          "id": "jovian-rings",
          "name": "Faint ring plane",
          "kind": "rings",
          "latitude": 0,
          "longitude": null,
          "description": "A faint system of dust rings surrounds Jupiter.",
          "whyInteresting": "A reminder that all four giant planets have rings.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/facts/"
          ],
          "coordinateNotes": "Equatorial ring-plane reference; ring particles have no fixed surface longitude."
        }
      ]
    },
    {
      "id": "saturn",
      "name": "Saturn",
      "category": "gas-giant",
      "description": "A low-density gas giant with extensive icy rings, strong winds and striking polar atmospheric patterns.",
      "mapping": {
        "kind": "cloud-deck",
        "note": "Illustrative cloud-deck globe, not a solid-surface or live weather map. Atmospheric regions have no fixed longitude.",
        "sourceUrls": [
          "https://science.nasa.gov/saturn/facts/"
        ]
      },
      "weather": {
        "mode": "climatology",
        "summary": "Reference atmosphere and archived Cassini observations. The hexagon and polar-region markers are geographic regions, not live weather observations.",
        "sourceUrls": [
          "https://science.nasa.gov/saturn/facts/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "58,232 km",
          "semantics": "reference",
          "context": "Volumetric mean radius; atmospheric reference figure, not a solid surface.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturnfact.html"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity",
          "value": "11.19 m/s²",
          "semantics": "reference",
          "context": "Mean gravity at the 1-bar reference level; no solid surface.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturnfact.html"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "10.656 h",
          "semantics": "reference",
          "context": "System III reference rotation; cloud motions differ from this period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturnfact.html"
          ]
        },
        {
          "id": "solar-day",
          "label": "Solar day",
          "value": "10.656 h",
          "semantics": "reference",
          "context": "Reference noon-to-noon period; atmospheric clouds rotate at different rates.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturnfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit",
          "value": "10,755.699 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the Sun; Earth days.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturnfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Mostly H₂ and helium",
          "semantics": "typical",
          "context": "Cloud layers contain compounds including ammonia.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturnfact.html"
          ]
        },
        {
          "id": "temperature",
          "label": "At 1 bar",
          "value": "134 K (~−139 °C)",
          "semantics": "typical",
          "context": "Reference atmospheric temperature; deeper layers are warmer.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturnfact.html"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "1 bar = 100 kPa",
          "semantics": "reference",
          "context": "A defined atmospheric level; Saturn has no solid surface.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/facts/"
          ]
        },
        {
          "id": "winds",
          "label": "Equatorial winds",
          "value": "Up to ~500 m/s",
          "semantics": "measured",
          "context": "Reported upper-atmosphere speeds; historical/compiled measurements, not a live layer.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/facts/"
          ]
        }
      ],
      "points": [
        {
          "id": "hexagon",
          "name": "North polar hexagon band",
          "kind": "latitude-band",
          "latitude": 78,
          "longitude": null,
          "description": "A six-sided jet pattern encircles the northern polar region.",
          "whyInteresting": "A persistent atmospheric wave can form a striking geometric pattern.",
          "sourceUrls": [
            "https://science.nasa.gov/photojournal/saturns-active-north-pole/"
          ],
          "coordinateNotes": "Approximate 78° N reference latitude from Cassini reporting; no fixed longitude."
        },
        {
          "id": "south-vortex",
          "name": "South polar vortex region",
          "kind": "pole",
          "latitude": -90,
          "longitude": null,
          "description": "Cassini observed a hurricane-like vortex around the south pole.",
          "whyInteresting": "The archived southern view contrasts with the northern hexagonal pattern.",
          "sourceUrls": [
            "https://science.nasa.gov/missions/cassini/cassini-images-bizarre-hexagon-on-saturn/"
          ],
          "coordinateNotes": "Archived Cassini-era regional description, not a current storm position."
        },
        {
          "id": "main-rings",
          "name": "Main ring plane",
          "kind": "rings",
          "latitude": 0,
          "longitude": null,
          "description": "The broad ring system is made mostly of ice particles with rocky material.",
          "whyInteresting": "View the rings in the equatorial plane and compare their scale with the planet.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/facts/"
          ],
          "coordinateNotes": "Equatorial ring-plane reference, not a surface landmark."
        }
      ]
    },
    {
      "id": "uranus",
      "name": "Uranus",
      "category": "ice-giant",
      "description": "An ice giant with a strongly tilted spin axis, methane-bearing air and narrow dark rings.",
      "mapping": {
        "kind": "cloud-deck",
        "note": "Illustrative cloud-deck globe, not a solid-surface or live weather map. Atmospheric regions have no fixed longitude.",
        "sourceUrls": [
          "https://science.nasa.gov/uranus/facts/"
        ]
      },
      "weather": {
        "mode": "climatology",
        "summary": "Reference atmosphere and dated spacecraft/telescope observations. Polar and ring markers identify regions, with no live wind or cloud imagery.",
        "sourceUrls": [
          "https://science.nasa.gov/uranus/facts/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "25,362 km",
          "semantics": "reference",
          "context": "Volumetric mean radius; atmospheric reference figure, not a solid surface.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uranusfact.html"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity",
          "value": "9.01 m/s²",
          "semantics": "reference",
          "context": "Mean gravity at the 1-bar reference level; no solid surface.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uranusfact.html"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "17.24 h · retrograde",
          "semantics": "reference",
          "context": "Voyager-era magnetic-coordinate reference; extreme axial tilt and atmospheric differential rotation.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uranusfact.html"
          ]
        },
        {
          "id": "solar-day",
          "label": "Solar day",
          "value": "17.24 h",
          "semantics": "reference",
          "context": "Reference noon-to-noon period; atmospheric clouds rotate at different rates.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uranusfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit",
          "value": "30,685.400 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the Sun; Earth days.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uranusfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "H₂, helium and methane",
          "semantics": "typical",
          "context": "Methane absorbs red light and contributes to the blue-green appearance.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "At 1 bar",
          "value": "76 K (~−197 °C)",
          "semantics": "typical",
          "context": "Reference temperature at 1 bar; the colder upper atmosphere is a different level.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uranusfact.html"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "1 bar = 100 kPa",
          "semantics": "reference",
          "context": "An atmospheric datum; Uranus has no true solid surface.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/facts/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Up to ~250 m/s",
          "semantics": "measured",
          "context": "Reference observed range; equatorial and high-latitude flows differ.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uranusfact.html"
          ]
        }
      ],
      "points": [
        {
          "id": "north-polar-cap",
          "name": "North polar cap region",
          "kind": "pole",
          "latitude": 90,
          "longitude": null,
          "description": "Webb images reveal a bright cap over the northern polar region.",
          "whyInteresting": "A polar view exposes seasonal haze and cloud structures.",
          "sourceUrls": [
            "https://science.nasa.gov/missions/webb/nasas-webb-scores-another-ringed-world-with-new-image-of-uranus/"
          ],
          "coordinateNotes": "Regional pole marker based on dated telescope images; no current cap boundary."
        },
        {
          "id": "south-pole",
          "name": "South polar region",
          "kind": "pole",
          "latitude": -90,
          "longitude": null,
          "description": "The opposite pole experiences the other half of Uranus’ extreme seasonal cycle.",
          "whyInteresting": "Its sideways tilt leads to prolonged polar illumination and darkness.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/facts/"
          ],
          "coordinateNotes": "Geometric south pole; a seasonal reference region, not a tracked weather feature."
        },
        {
          "id": "uranian-rings",
          "name": "Uranian ring plane",
          "kind": "rings",
          "latitude": 0,
          "longitude": null,
          "description": "A narrow, dark ring system shares the planet’s tilted equatorial plane.",
          "whyInteresting": "The ring plane helps explain Uranus’ unusual orientation.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/facts/"
          ],
          "coordinateNotes": "Equatorial ring-plane reference; no fixed ring-particle longitude."
        }
      ]
    },
    {
      "id": "neptune",
      "name": "Neptune",
      "category": "ice-giant",
      "description": "A distant ice giant with a dynamic methane-bearing atmosphere, powerful winds and faint rings.",
      "mapping": {
        "kind": "cloud-deck",
        "note": "Illustrative cloud-deck globe, not a solid-surface or live weather map. Atmospheric regions have no fixed longitude.",
        "sourceUrls": [
          "https://science.nasa.gov/neptune/facts/"
        ]
      },
      "weather": {
        "mode": "climatology",
        "summary": "Reference atmosphere and historical observations only. Dark vortices evolve and vanish; the Voyager Great Dark Spot is not plotted as a current feature.",
        "sourceUrls": [
          "https://science.nasa.gov/neptune/facts/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "24,622 km",
          "semantics": "reference",
          "context": "Volumetric mean radius; atmospheric reference figure, not a solid surface.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity",
          "value": "11.27 m/s²",
          "semantics": "reference",
          "context": "Mean gravity at the 1-bar reference level; no solid surface.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "16.11 h",
          "semantics": "reference",
          "context": "Voyager-era magnetic-coordinate reference; clouds rotate at different rates.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html"
          ]
        },
        {
          "id": "solar-day",
          "label": "Solar day",
          "value": "16.11 h",
          "semantics": "reference",
          "context": "Reference noon-to-noon period; atmospheric clouds rotate at different rates.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit",
          "value": "60,189.018 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the Sun; Earth days.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "H₂, helium and methane",
          "semantics": "typical",
          "context": "A deep atmosphere over fluid interior layers, not a solid surface.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "At 1 bar",
          "value": "72 K (~−201 °C)",
          "semantics": "typical",
          "context": "Reference atmospheric temperature at a stated pressure.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "1 bar = 100 kPa",
          "semantics": "reference",
          "context": "A reference atmospheric level; there is no ground-level weather station.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/facts/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Up to ~580 m/s",
          "semantics": "measured",
          "context": "Compiled observed range; not a current wind measurement.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptunefact.html"
          ]
        },
        {
          "id": "historical-dark-spot",
          "label": "Voyager Great Dark Spot",
          "value": "Observed in 1989; later vanished",
          "semantics": "historical",
          "context": "Historical storm, not a present-day longitude or map pin.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/facts/"
          ]
        }
      ],
      "points": [
        {
          "id": "equatorial-atmosphere",
          "name": "Equatorial atmosphere",
          "kind": "latitude-band",
          "latitude": 0,
          "longitude": null,
          "description": "A reference band for exploring Neptune’s windy atmosphere.",
          "whyInteresting": "Clouds drift, so the atlas identifies a broad region rather than a fixed storm.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/facts/"
          ],
          "coordinateNotes": "Geometric equator, not the measured center of a particular cloud or vortex."
        },
        {
          "id": "south-polar-region",
          "name": "South polar atmosphere",
          "kind": "pole",
          "latitude": -90,
          "longitude": null,
          "description": "Thermal images in September 2006 revealed a relatively warm southern polar region.",
          "whyInteresting": "Temperature depends on altitude and season; this is a dated observation.",
          "sourceUrls": [
            "https://science.nasa.gov/photojournal/neptunes-hot-south-pole/"
          ],
          "coordinateNotes": "South-pole regional marker; the 2006 thermal observations are not current weather."
        },
        {
          "id": "neptunian-rings",
          "name": "Rings and Adams arcs",
          "kind": "rings",
          "latitude": 0,
          "longitude": null,
          "description": "Faint rings include clumps of material known as arcs in the Adams ring.",
          "whyInteresting": "The arcs reveal how nearby moons can influence ring structure.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/facts/"
          ],
          "coordinateNotes": "Equatorial ring-plane reference; no present-day arc longitudes are asserted."
        }
      ]
    },
    {
      "id": "pluto",
      "name": "Pluto",
      "category": "dwarf-planet",
      "parentId": "sun",
      "description": "A Kuiper Belt dwarf planet with nitrogen-ice plains, water-ice mountains and a tenuous, seasonally changing atmosphere.",
      "mapping": {
        "kind": "surface",
        "note": "Static LORRI/MVIC grayscale surface mosaic. Detail varies sharply across the globe; the black southern region is missing spacecraft coverage, not dark terrain. NASA/JHUAPL/SwRI/LPI; USGS.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/pluto_new_horizons_lorri_mvic_global_mosaic_300m"
        ]
      },
      "weather": {
        "mode": "climatology",
        "summary": "Seasonal nitrogen-ice exchange, haze and inferred circulation are reference science. No current global temperature, cloud or wind observations are being streamed.",
        "sourceUrls": [
          "https://science.nasa.gov/dwarf-planets/pluto/facts/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Primary",
          "value": "Sun",
          "semantics": "reference",
          "context": "Dwarf planet orbiting the Sun, in the Kuiper Belt.",
          "sourceUrls": [
            "https://science.nasa.gov/dwarf-planets/pluto/facts/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "1,188 km",
          "semantics": "reference",
          "context": "NSSDCA rounded volumetric mean.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/plutofact.html"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity",
          "value": "0.62 m/s²",
          "semantics": "reference",
          "context": "Reference mean surface gravity.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/plutofact.html"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "153.2928 h · retrograde",
          "semantics": "reference",
          "context": "Sidereal rotation; Charon remains over the same hemisphere.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/plutofact.html",
            "https://science.nasa.gov/dwarf-planets/pluto/facts/"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Sun",
          "value": "90,560 Earth days",
          "semantics": "reference",
          "context": "Sidereal solar orbit, about 248 Earth years.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/plutofact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Tenuous N₂, CH₄ and CO",
          "semantics": "reference",
          "context": "Volatile ices exchange material with a seasonally varying atmosphere.",
          "sourceUrls": [
            "https://science.nasa.gov/dwarf-planets/pluto/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Surface temperature range",
          "value": "~24–38 K",
          "semantics": "reference",
          "context": "NSSDCA reference range; not a current global measurement.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/plutofact.html"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface pressure reference",
          "value": "~13 microbar (1.3 Pa)",
          "semantics": "reference",
          "context": "Variable tenuous atmosphere; this archived estimate is not a live pressure reading.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/plutofact.html"
          ]
        },
        {
          "id": "winds",
          "label": "Published circulation model",
          "value": "Nitrogen-ice cycle drives westward flow",
          "semantics": "model",
          "context": "2020 climate-model interpretation of New Horizons 2015 data; not a live or directly measured wind field.",
          "sourceUrls": [
            "https://www.nasa.gov/solar-system/five-years-after-new-horizons-historic-flyby-here-are-10-cool-things-we-learned-about-pluto/"
          ]
        }
      ],
      "points": [
        {
          "id": "sputnik",
          "name": "Sputnik Planitia",
          "kind": "surface-feature",
          "latitude": 19.51,
          "longitude": 178.69,
          "description": "A broad nitrogen-ice plain forming the western lobe of Pluto’s bright heart.",
          "whyInteresting": "Its cellular ice patterns connect the landscape to the volatile cycle.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/15669",
            "https://www.nasa.gov/solar-system/five-years-after-new-horizons-historic-flyby-here-are-10-cool-things-we-learned-about-pluto/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 45536; planetocentric latitude; east-positive longitude normalized to −180…180 from 178.69° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "tombaugh",
          "name": "Tombaugh Regio",
          "kind": "surface-feature",
          "latitude": 7.62,
          "longitude": -176.78,
          "description": "The large bright heart-shaped region named for Pluto’s discoverer.",
          "whyInteresting": "A regional center marker places the famous heart in geographic context.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/15668",
            "https://science.nasa.gov/dwarf-planets/pluto/facts/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 45535; planetocentric latitude; east-positive longitude normalized to −180…180 from 183.22° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "wright",
          "name": "Wright Mons",
          "kind": "surface-feature",
          "latitude": -21.36,
          "longitude": 173.24,
          "description": "A mountain with a central depression interpreted as a possible cryovolcanic edifice.",
          "whyInteresting": "New Horizons images prompted the ice-volcano hypothesis; activity here is not being tracked live.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/15835",
            "https://www.nasa.gov/image-article/plutos-wright-mons-color/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 45703; planetocentric latitude; east-positive longitude normalized to −180…180 from 173.24° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "io",
      "name": "Io",
      "category": "moon",
      "parentId": "jupiter",
      "description": "Jupiter’s intensely volcanic inner Galilean moon is reshaped by tidal heating, lava and sulfur-rich deposits.",
      "mapping": {
        "kind": "surface",
        "note": "Static false-color surface mosaic, not current volcanic activity. Color coverage is missing within about 5° of either pole. Gray caps mark unknown coverage; publisher polar interpolation and smearing are not observed terrain. NASA/JPL; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/io_voyager_galileo_ssi_false_color_global_mosaic_1km"
        ]
      },
      "weather": {
        "mode": "climatology",
        "summary": "Thin sulfur-dioxide gas responds to sunlight and eclipse. Reference observations describe this unusual atmosphere; no current global gas-flow or eruption field is provided.",
        "sourceUrls": [
          "https://science.nasa.gov/jupiter/jupiter-moons/io/facts/",
          "https://www.nasa.gov/solar-system/new-research-reveals-fluctuating-atmosphere-of-jupiters-volcanic-moon/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Jupiter",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/jupiter-moons/io/facts/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "1,821.49 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "1.796 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "42.459 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Jupiter.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Jupiter",
          "value": "1.769138 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Thin sulfur dioxide (SO₂)",
          "semantics": "reference",
          "context": "Volcanic gas and sublimating frost supply the atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/solar-system/new-research-reveals-fluctuating-atmosphere-of-jupiters-volcanic-moon/"
          ]
        },
        {
          "id": "temperature",
          "label": "Eclipse-study surface cooling",
          "value": "~125 → 105 K",
          "semantics": "historical",
          "context": "November 2013 observations reported −235 → −270 °F; converted to kelvin. Local volcanic hot spots differ.",
          "sourceUrls": [
            "https://www.nasa.gov/solar-system/new-research-reveals-fluctuating-atmosphere-of-jupiters-volcanic-moon/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure behavior",
          "value": "Atmosphere partially collapses in eclipse",
          "semantics": "historical",
          "context": "2013 observations linked cooling to SO₂ frost; no fixed global pressure is assigned.",
          "sourceUrls": [
            "https://www.nasa.gov/solar-system/new-research-reveals-fluctuating-atmosphere-of-jupiters-volcanic-moon/"
          ]
        },
        {
          "id": "winds",
          "label": "Gas transport",
          "value": "Variable; no current wind field",
          "semantics": "reference",
          "context": "Rarefied volcanic and sublimation-driven gas is not represented by Earth’s wind model.",
          "sourceUrls": [
            "https://www.nasa.gov/solar-system/new-research-reveals-fluctuating-atmosphere-of-jupiters-volcanic-moon/"
          ]
        }
      ],
      "points": [
        {
          "id": "loki",
          "name": "Loki Patera",
          "kind": "surface-feature",
          "latitude": 13.01,
          "longitude": 51.21,
          "description": "A large volcanic depression where Galileo recorded changing thermal patterns.",
          "whyInteresting": "The 1999–2000 temperature comparison documents geological change rather than a current eruption.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3459",
            "https://www.jpl.nasa.gov/images/pia02549-temperature-comparison-at-loki/"
          ],
          "coordinateNotes": "Voyager/Galileo SSI, geometry 44236; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 308.79° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "pele",
          "name": "Pele",
          "kind": "surface-feature",
          "latitude": -18.71,
          "longitude": 104.72,
          "description": "An officially named volcanic eruptive center in Io’s southern hemisphere.",
          "whyInteresting": "A contrasting southern volcanic landmark on a rapidly resurfaced moon.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/4638"
          ],
          "coordinateNotes": "Voyager/Galileo SSI, geometry 44258; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 255.28° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "prometheus",
          "name": "Prometheus",
          "kind": "surface-feature",
          "latitude": -1.52,
          "longitude": -153.94,
          "description": "An eruptive center where Galileo mapped lava flow and associated hot spots.",
          "whyInteresting": "Historical camera and infrared data link a named feature to volcanic processes.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/4836",
            "https://science.nasa.gov/photojournal/ongoing-geologic-activity-at-prometheus-volcano-io/"
          ],
          "coordinateNotes": "Voyager/Galileo SSI, geometry 44176; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 153.94° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "europa",
      "name": "Europa",
      "category": "moon",
      "parentId": "jupiter",
      "description": "An ice-covered Galilean moon whose fractured shell overlies strong evidence for a salty subsurface ocean.",
      "mapping": {
        "kind": "surface",
        "note": "Static visible-light mosaic of the icy surface. Sharpness and lighting vary between flybys; black source coverage gaps remain unknown. NASA/JPL; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/europa_voyager_galileo_ssi_global_mosaic_500m"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Europa’s oxygen envelope is extremely tenuous. Surface temperatures vary with sunlight and terrain; these references are not a live ice-temperature or plume map.",
        "sourceUrls": [
          "https://science.nasa.gov/jupiter/jupiter-moons/europa/",
          "https://science.nasa.gov/mission/europa-clipper/mission-faq/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Jupiter",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/jupiter-moons/europa/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "1,560.8 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "1.315 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "85.228 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Jupiter.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Jupiter",
          "value": "3.551181 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Extremely thin oxygen envelope",
          "semantics": "reference",
          "context": "Produced from surface ice; far too sparse for ordinary air weather.",
          "sourceUrls": [
            "https://science.nasa.gov/mission/europa-clipper/mission-faq/"
          ]
        },
        {
          "id": "temperature",
          "label": "Surface temperature context",
          "value": "~50–140 K",
          "semantics": "reference",
          "context": "Mission FAQ range: bright polar ice to dark equatorial material, not a global forecast.",
          "sourceUrls": [
            "https://science.nasa.gov/mission/europa-clipper/mission-faq/"
          ]
        },
        {
          "id": "pressure",
          "label": "Historical oxygen pressure",
          "value": "~10⁻¹¹ of Earth’s surface pressure",
          "semantics": "historical",
          "context": "Hubble report published 23 February 1995; an approximate inferred value, not current telemetry.",
          "sourceUrls": [
            "https://science.nasa.gov/missions/hubble/hubble-finds-oxygen-atmosphere-on-jupiters-moon-europa/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Not applicable to ordinary air weather",
          "semantics": "reference",
          "context": "No global atmospheric wind product is available here.",
          "sourceUrls": [
            "https://science.nasa.gov/mission/europa-clipper/mission-faq/"
          ]
        }
      ],
      "points": [
        {
          "id": "pwyll",
          "name": "Pwyll",
          "kind": "surface-feature",
          "latitude": -25.2,
          "longitude": 88.6,
          "description": "A named impact crater in Europa’s southern hemisphere.",
          "whyInteresting": "An impact landmark complements the moon’s widespread fractured terrain.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/4878"
          ],
          "coordinateNotes": "USGS displayed default, geometry 4878; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 271.40° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "conamara",
          "name": "Conamara Chaos",
          "kind": "surface-feature",
          "latitude": 9.7,
          "longitude": 87.3,
          "description": "An officially mapped region of disrupted, chaotic ice terrain.",
          "whyInteresting": "A close geographic anchor for exploring the broken-ice landscape.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/1282",
            "https://science.nasa.gov/mission/europa-clipper/mission-faq/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 1282; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 272.70° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "tyre",
          "name": "Tyre",
          "kind": "surface-feature",
          "latitude": 33.6,
          "longitude": -146.6,
          "description": "A large ringed feature catalogued on Europa’s northern hemisphere.",
          "whyInteresting": "Shows a different class of impact-related landform from a simple crater.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6170"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6170; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 146.60° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "ganymede",
      "name": "Ganymede",
      "category": "moon",
      "parentId": "jupiter",
      "description": "The solar system’s largest moon combines ancient dark terrain, bright grooved ice and its own magnetic field.",
      "mapping": {
        "kind": "surface",
        "note": "Static spacecraft color mosaic with mixed resolutions and visible seams. Black polar coverage gaps are retained rather than reconstructed. NASA/JPL; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/ganymede_voyager_galileo_ssi_color_global_mosaic_1_4km"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "A thin oxygen atmosphere surrounds a cold ice surface. Daytime thermal references and static mosaics do not provide current atmospheric or auroral conditions.",
        "sourceUrls": [
          "https://science.nasa.gov/jupiter/jupiter-moons/ganymede/facts/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Jupiter",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/jupiter-moons/ganymede/facts/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "2,631.2 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "1.428 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "171.709 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Jupiter.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Jupiter",
          "value": "7.154553 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Tenuous oxygen atmosphere",
          "semantics": "reference",
          "context": "Hubble evidence; no dense atmosphere to retain surface heat.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/jupiter-moons/ganymede/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Daytime surface range",
          "value": "~90–160 K",
          "semantics": "reference",
          "context": "NASA reference daytime range; latitude and local time matter.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/jupiter-moons/ganymede/facts/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure context",
          "value": "Extremely tenuous; no dense-air datum",
          "semantics": "reference",
          "context": "No numerical global pressure is assigned in this atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/jupiter-moons/ganymede/facts/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Not applicable to ordinary air weather",
          "semantics": "reference",
          "context": "The sparse oxygen envelope is not an Earth-style weather system.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/jupiter-moons/ganymede/facts/"
          ]
        }
      ],
      "points": [
        {
          "id": "galileo-regio",
          "name": "Galileo Regio",
          "kind": "surface-feature",
          "latitude": 45,
          "longitude": -127,
          "description": "A broad named region in Ganymede’s northern hemisphere.",
          "whyInteresting": "Its regional scale helps compare the globe with smaller crater landmarks.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/2076"
          ],
          "coordinateNotes": "USGS displayed default, geometry 2076; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 127.00° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "tros",
          "name": "Tros",
          "kind": "surface-feature",
          "latitude": 11.14,
          "longitude": -27.26,
          "description": "A named impact crater close to Ganymede’s equator.",
          "whyInteresting": "A compact equatorial anchor for navigating the surface mosaic.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6091"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6091; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 27.26° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "osiris",
          "name": "Osiris",
          "kind": "surface-feature",
          "latitude": -38,
          "longitude": -166.31,
          "description": "An officially mapped crater in the southern hemisphere.",
          "whyInteresting": "Provides a southern counterpart to the northern regional marker.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/4509"
          ],
          "coordinateNotes": "USGS displayed default, geometry 4509; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 166.31° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "callisto",
      "name": "Callisto",
      "category": "moon",
      "parentId": "jupiter",
      "description": "The outer Galilean moon preserves an ancient cratered ice-and-rock surface, including vast multi-ring impact structures.",
      "mapping": {
        "kind": "surface",
        "note": "Static visible-light surface mosaic with uneven resolution and lighting. Black source coverage gaps are unknown, including some polar and southern terrain. NASA/JPL; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/callisto_galileo_voyager_global_mosaic_1km"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Callisto has an extremely thin exosphere rather than dense-air weather. Galileo-era gas and temperature estimates are historical references, not present conditions.",
        "sourceUrls": [
          "https://science.nasa.gov/jupiter/jupiter-moons/callisto/facts/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Jupiter",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/jupiter-moons/callisto/facts/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "2,410.3 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "1.236 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "400.536 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Jupiter.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Jupiter",
          "value": "16.689017 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/joviansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Exosphere",
          "value": "Very tenuous CO₂, with O and H detections",
          "semantics": "reference",
          "context": "Galileo and later studies describe an extremely sparse gaseous envelope.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/jupiter-moons/callisto/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Galileo-era thermal estimate",
          "value": "~150 K",
          "semantics": "historical",
          "context": "1999 atmosphere study: approximate gas temperature close to the sampled surface temperature, not a global mean.",
          "sourceUrls": [
            "https://ntrs.nasa.gov/citations/20040142091"
          ]
        },
        {
          "id": "pressure",
          "label": "Historical CO₂ pressure",
          "value": "~7.5 × 10⁻¹² bar",
          "semantics": "historical",
          "context": "1999 Galileo-NIMS atmospheric inference; not a live global measurement.",
          "sourceUrls": [
            "https://ntrs.nasa.gov/citations/20040142091"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Not applicable to ordinary air weather",
          "semantics": "reference",
          "context": "No current exospheric flow field is supplied.",
          "sourceUrls": [
            "https://science.nasa.gov/jupiter/jupiter-moons/callisto/facts/"
          ]
        }
      ],
      "points": [
        {
          "id": "valhalla",
          "name": "Valhalla",
          "kind": "surface-feature",
          "latitude": 14.7,
          "longitude": -56,
          "description": "A large, officially catalogued ringed impact feature.",
          "whyInteresting": "One of the globe’s major reference landmarks for exploring impact-ring geography.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6284"
          ],
          "coordinateNotes": "Callisto RAND 1999, geometry 46634; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 56.00° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "asgard",
          "name": "Asgard",
          "kind": "surface-feature",
          "latitude": 32.2,
          "longitude": -139.9,
          "description": "A second extensive ringed feature in the northern hemisphere.",
          "whyInteresting": "Allows comparison between two large impact structures on one ancient surface.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/420"
          ],
          "coordinateNotes": "Callisto RAND 1999, geometry 46764; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 139.90° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "lofn",
          "name": "Lofn",
          "kind": "surface-feature",
          "latitude": -56.5,
          "longitude": -22.3,
          "description": "A named impact crater at high southern latitude.",
          "whyInteresting": "Extends exploration beyond the northern multi-ring basins.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3451"
          ],
          "coordinateNotes": "USGS displayed default, geometry 3451; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 22.30° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "mimas",
      "name": "Mimas",
      "category": "moon",
      "parentId": "saturn",
      "description": "A small cratered icy moon of Saturn, distinguished by the outsized Herschel impact basin.",
      "mapping": {
        "kind": "surface",
        "note": "Static simple-cylindrical spacecraft mosaic, including the 2016–2017 close flybys. Source resolution and illumination vary; polar stretching is a map-projection effect. NASA/JPL-Caltech/Space Science Institute. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://science.nasa.gov/photojournal/mimas-global-map-june-2017/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Mimas has no substantial atmosphere. Surface heating depends on sunlight and ice properties; the cited thermal pattern is a dated Cassini observation.",
        "sourceUrls": [
          "https://science.nasa.gov/saturn/moons/mimas/",
          "https://science.nasa.gov/saturn/moons/titan/facts/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Saturn",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/mimas/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "198.2 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.064 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "22.618 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Saturn.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Saturn",
          "value": "0.9424218 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No substantial atmosphere",
          "semantics": "reference",
          "context": "Icy satellite; no dense-air weather.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/mimas/",
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Cassini thermal-map maximum",
          "value": "~95 K",
          "semantics": "historical",
          "context": "13 February 2010 scene; its Pac-Man pattern is not a current or whole-orbit temperature range.",
          "sourceUrls": [
            "https://science.nasa.gov/resource/a-pair-of-pac-men/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure context",
          "value": "No dense-air surface-pressure datum",
          "semantics": "reference",
          "context": "No numerical pressure assigned.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/mimas/",
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Not applicable to ordinary air weather",
          "semantics": "reference",
          "context": "No substantial atmosphere or atmospheric wind layer is represented.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        }
      ],
      "points": [
        {
          "id": "herschel",
          "name": "Herschel",
          "kind": "surface-feature",
          "latitude": -1.38,
          "longitude": -111.76,
          "description": "The large impact crater that dominates familiar views of Mimas.",
          "whyInteresting": "Its exceptional size makes the scale of impacts on a small moon immediately apparent.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/2478",
            "https://science.nasa.gov/saturn/moons/mimas/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 2478; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 111.76° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "arthur",
          "name": "Arthur",
          "kind": "surface-feature",
          "latitude": -35.4,
          "longitude": 163.96,
          "description": "A named impact crater in the southern hemisphere.",
          "whyInteresting": "Compares a smaller crater landmark with giant Herschel.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/403"
          ],
          "coordinateNotes": "USGS displayed default, geometry 403; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 196.04° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "merlin",
          "name": "Merlin",
          "kind": "surface-feature",
          "latitude": -38.43,
          "longitude": 140.99,
          "description": "A southern crater named within Mimas’s Arthurian naming theme.",
          "whyInteresting": "A memorable navigation target connecting the map with official planetary nomenclature.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3857"
          ],
          "coordinateNotes": "USGS displayed default, geometry 3857; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 219.01° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "enceladus",
      "name": "Enceladus",
      "category": "moon",
      "parentId": "saturn",
      "description": "A reflective icy ocean moon whose south-polar fractures vent water vapor and ice particles into space.",
      "mapping": {
        "kind": "surface",
        "note": "Static Cassini surface mosaic; the south-polar fractures are mapped terrain, not a live view of plumes. Resolution and illumination vary, and source seams are retained. NASA/JPL-Caltech/Space Science Institute; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/enceladus_cassini_global_mosaic_110m"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Localized plume gas and falling ice originate from south-polar fractures. They are not ordinary atmospheric winds, clouds or rain; no present plume activity is inferred from this map.",
        "sourceUrls": [
          "https://science.nasa.gov/saturn/moons/enceladus/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Saturn",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/enceladus/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "252.1 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.113 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "32.885 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Saturn.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Saturn",
          "value": "1.370218 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Gaseous environment",
          "value": "Localized water-vapor-rich plumes",
          "semantics": "reference",
          "context": "Cassini observed gas and ice escaping the south-polar fractures.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/enceladus/"
          ]
        },
        {
          "id": "temperature",
          "label": "Surface temperature reference",
          "value": "~72 K (−201 °C)",
          "semantics": "reference",
          "context": "Cold reflective surface; warm fracture zones differ greatly.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/enceladus/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure context",
          "value": "Plume environment; no global air datum",
          "semantics": "reference",
          "context": "Localized vent gas cannot be treated as a uniform dense atmosphere.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/enceladus/"
          ]
        },
        {
          "id": "winds",
          "label": "Plume speed, not wind",
          "value": "~400 m/s reported by Cassini",
          "semantics": "historical",
          "context": "2005 discovery report describes escaping material, not a current atmospheric wind speed.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/enceladus/"
          ]
        }
      ],
      "points": [
        {
          "id": "baghdad",
          "name": "Baghdad Sulcus",
          "kind": "surface-feature",
          "latitude": -86.91,
          "longitude": 129.46,
          "description": "A named south-polar fracture within the tiger-stripe region.",
          "whyInteresting": "A geographic anchor for the fractured polar terrain associated with plume activity.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14248",
            "https://science.nasa.gov/saturn/moons/enceladus/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 14248; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 230.54° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "damascus",
          "name": "Damascus Sulcus",
          "kind": "surface-feature",
          "latitude": -80.59,
          "longitude": 74.13,
          "description": "A second named south-polar sulcus, or groove.",
          "whyInteresting": "Connects the neighboring fracture locations without claiming current vent positions.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14252",
            "https://science.nasa.gov/saturn/moons/enceladus/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 14252; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 285.87° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "alexandria",
          "name": "Alexandria Sulcus",
          "kind": "surface-feature",
          "latitude": -75.63,
          "longitude": -137.56,
          "description": "Another officially named groove in the south-polar fracture system.",
          "whyInteresting": "Shows that the polar terrain is a system of extended fractures, not a single point.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14247",
            "https://science.nasa.gov/saturn/moons/enceladus/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 14247; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 137.56° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "tethys",
      "name": "Tethys",
      "category": "moon",
      "parentId": "saturn",
      "description": "An icy, airless Saturnian moon with the giant Odysseus basin and the extensive Ithaca Chasma valley system.",
      "mapping": {
        "kind": "surface",
        "note": "Static spacecraft surface mosaic with different imaging resolutions and lighting across the globe. Source seams and polar projection stretching remain visible. NASA/JPL-Caltech/Space Science Institute; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/tethys_cassini_global_mosaic_293m"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless ice terrain undergoes solar heating and impact weathering. Reference temperature and imagery do not imply atmospheric winds or current weather.",
        "sourceUrls": [
          "https://science.nasa.gov/saturn/moons/tethys/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Saturn",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/tethys/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "531.1 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.146 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "45.307 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Saturn.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Saturn",
          "value": "1.887802 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Airless icy world",
          "semantics": "reference",
          "context": "NASA describes Tethys as a cold, airless body.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/tethys/"
          ]
        },
        {
          "id": "temperature",
          "label": "Surface temperature reference",
          "value": "~86 K (−187 °C)",
          "semantics": "reference",
          "context": "NASA reference average; sunlight and terrain create local differences.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/tethys/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure context",
          "value": "No dense-air surface-pressure datum",
          "semantics": "reference",
          "context": "No numerical pressure is assigned to the airless surface.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/tethys/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Not applicable",
          "semantics": "reference",
          "context": "No ordinary atmosphere to sustain wind or rain.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/tethys/"
          ]
        }
      ],
      "points": [
        {
          "id": "odysseus",
          "name": "Odysseus",
          "kind": "surface-feature",
          "latitude": 32.82,
          "longitude": -128.89,
          "description": "The enormous impact basin that dominates one hemisphere of Tethys.",
          "whyInteresting": "Its subdued crater relief records the response of an icy body to a major impact.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/4406",
            "https://science.nasa.gov/saturn/moons/tethys/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 4406; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 128.89° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "ithaca",
          "name": "Ithaca Chasma",
          "kind": "surface-feature",
          "latitude": -14,
          "longitude": -6.1,
          "description": "A long valley system crossing much of Tethys.",
          "whyInteresting": "A regional center marker represents an extended chasm, not its complete outline.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/2751",
            "https://science.nasa.gov/saturn/moons/tethys/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 2751; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 6.10° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "penelope",
          "name": "Penelope",
          "kind": "surface-feature",
          "latitude": -10.83,
          "longitude": 110.78,
          "description": "A prominent named impact crater nearer the equator.",
          "whyInteresting": "Adds a contrasting crater target away from the giant Odysseus basin.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/4645"
          ],
          "coordinateNotes": "USGS displayed default, geometry 4645; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 249.22° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "dione",
      "name": "Dione",
      "category": "moon",
      "parentId": "saturn",
      "description": "An icy Saturnian moon with ancient craters, tectonic fracture cliffs and a very tenuous oxygen exosphere.",
      "mapping": {
        "kind": "surface",
        "note": "Static visible-light surface mosaic. Bright wispy terrain is fractured ice, not weather; illumination, detail and projection stretching vary across the reference map. NASA/JPL-Caltech/Space Science Institute; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/dione_cassini_voyager_global_mosaic_154m"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Dione’s oxygen exosphere is extremely sparse. Fracture cliffs are geology; the map does not represent current air weather or active tectonics.",
        "sourceUrls": [
          "https://science.nasa.gov/saturn/moons/dione/",
          "https://www.jpl.nasa.gov/news/cassini-detects-hint-of-fresh-air-at-dione/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Saturn",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/dione/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "561.4 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.232 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "65.686 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Saturn.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Saturn",
          "value": "2.736915 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Exosphere",
          "value": "Extremely tenuous oxygen",
          "semantics": "historical",
          "context": "Cassini detected oxygen ions on 7 April 2010; report published March 2012.",
          "sourceUrls": [
            "https://www.jpl.nasa.gov/news/cassini-detects-hint-of-fresh-air-at-dione/"
          ]
        },
        {
          "id": "temperature",
          "label": "Surface temperature reference",
          "value": "~87 K (−186 °C)",
          "semantics": "reference",
          "context": "NASA reference average; ice is rigid at this temperature.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/dione/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure context",
          "value": "Exosphere; no dense-air datum",
          "semantics": "reference",
          "context": "The oxygen detection is a rarefied-gas measurement, not a global pressure forecast.",
          "sourceUrls": [
            "https://www.jpl.nasa.gov/news/cassini-detects-hint-of-fresh-air-at-dione/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Not applicable to ordinary air weather",
          "semantics": "reference",
          "context": "No global oxygen-flow or surface wind field is supplied.",
          "sourceUrls": [
            "https://www.jpl.nasa.gov/news/cassini-detects-hint-of-fresh-air-at-dione/"
          ]
        }
      ],
      "points": [
        {
          "id": "dido",
          "name": "Dido",
          "kind": "surface-feature",
          "latitude": -23.97,
          "longitude": -18.82,
          "description": "A named impact crater in the southern hemisphere.",
          "whyInteresting": "An accessible crater landmark on Dione’s ancient ice surface.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/1531"
          ],
          "coordinateNotes": "USGS displayed default, geometry 1531; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 18.82° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "evander",
          "name": "Evander",
          "kind": "surface-feature",
          "latitude": -57,
          "longitude": -145,
          "description": "An extensive southern impact crater catalogued by the IAU.",
          "whyInteresting": "Contrasts with the smaller Dido crater and the long ridge system.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14353"
          ],
          "coordinateNotes": "USGS displayed default, geometry 14353; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 145.00° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "janiculum",
          "name": "Janiculum Dorsa",
          "kind": "surface-feature",
          "latitude": 24.6,
          "longitude": -144.1,
          "description": "A named system of ridges extending across Dione’s terrain.",
          "whyInteresting": "The marker identifies a regional center, illustrating a landform distinct from an impact crater.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14379"
          ],
          "coordinateNotes": "USGS displayed default, geometry 14379; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 144.10° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "rhea",
      "name": "Rhea",
      "category": "moon",
      "parentId": "saturn",
      "description": "Saturn’s second-largest moon preserves heavily cratered ice terrain and an exceptionally thin oxygen–carbon-dioxide exosphere.",
      "mapping": {
        "kind": "surface",
        "note": "Static spacecraft surface mosaic with heterogeneous resolution and lighting. Broad smooth areas and seams reflect source imaging quality; they are not reconstructed geography. NASA/JPL-Caltech/Space Science Institute; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/rhea_cassini_voyager_global_mosaic_417m"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Sunlit and shaded ice can differ strongly in temperature. Cassini’s exosphere detection is historical science, not a current oxygen, pressure or wind feed.",
        "sourceUrls": [
          "https://science.nasa.gov/saturn/moons/rhea/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Saturn",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/rhea/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "763.5 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.264 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "108.420 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Saturn.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Saturn",
          "value": "4.5175 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Exosphere",
          "value": "Very tenuous O₂ and CO₂",
          "semantics": "historical",
          "context": "Cassini detection reported in 2010.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/rhea/"
          ]
        },
        {
          "id": "temperature",
          "label": "Surface illumination range",
          "value": "~53–99 K",
          "semantics": "reference",
          "context": "NASA reference shaded-to-sunlit range (−220 to −174 °C).",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/rhea/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure context",
          "value": "Exosphere; no dense-air datum",
          "semantics": "reference",
          "context": "Extremely low gas density is not a dense atmospheric pressure layer.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/rhea/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Not applicable to ordinary air weather",
          "semantics": "reference",
          "context": "No current exospheric flow or air-weather field is supplied.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/rhea/"
          ]
        }
      ],
      "points": [
        {
          "id": "tirawa",
          "name": "Tirawa",
          "kind": "surface-feature",
          "latitude": 34.2,
          "longitude": -151.7,
          "description": "An officially named crater in Rhea’s northern hemisphere.",
          "whyInteresting": "A large-scale landmark within the moon’s heavily cratered terrain.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6026"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6026; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 151.70° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "inktomi",
          "name": "Inktomi",
          "kind": "surface-feature",
          "latitude": -14.1,
          "longitude": -112.1,
          "description": "A named crater south of Rhea’s equator.",
          "whyInteresting": "A compact equatorial-area anchor for surface navigation.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14671"
          ],
          "coordinateNotes": "USGS displayed default, geometry 14671; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 112.10° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "mamaldi",
          "name": "Mamaldi",
          "kind": "surface-feature",
          "latitude": 14,
          "longitude": 176,
          "description": "A broad impact crater crossing Rhea’s low northern latitudes.",
          "whyInteresting": "Lets the globe compare neighboring large impact structures.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14751"
          ],
          "coordinateNotes": "USGS displayed default, geometry 14751; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 184.00° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "titan",
      "name": "Titan",
      "category": "moon",
      "parentId": "saturn",
      "description": "A hazy nitrogen–methane world with hydrocarbon seas, rain-fed channels and equatorial dune fields above an icy crust.",
      "mapping": {
        "kind": "surface",
        "note": "Static ISS near-infrared surface reference seen through a methane window in the haze, not opaque clouds or a radar map. Gray coverage gaps are retained; brightness, seams and sharpness vary between observations. NASA/JPL-Caltech/Space Science Institute; USGS. The ISS surface window is 938 nm. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/titan_cassini_iss_global_mosaic_4005m"
        ]
      },
      "weather": {
        "mode": "climatology",
        "summary": "Titan has real methane clouds, rain and atmospheric circulation. Here they are static mission references; historical Huygens winds are not a current global weather field.",
        "sourceUrls": [
          "https://science.nasa.gov/saturn/moons/titan/facts/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Saturn",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "2,574.76 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "1.354 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "382.690 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Saturn.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Saturn",
          "value": "15.945421 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Dense N₂ with methane and organic haze",
          "semantics": "reference",
          "context": "Nitrogen dominates; methane supports clouds, rain and hydrocarbon surface liquids.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Surface temperature reference",
          "value": "~94 K (−179 °C)",
          "semantics": "reference",
          "context": "Cold enough for water ice to form rigid ground and hydrocarbons to remain liquid.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface pressure context",
          "value": "~1.6 × Earth’s surface pressure",
          "semantics": "reference",
          "context": "NASA approximate reference, varying with location and conditions; not live telemetry.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "winds",
          "label": "Huygens surface breeze",
          "value": "~0.3 m/s",
          "semantics": "historical",
          "context": "14 January 2005 descent-site estimate; winds aloft were much faster. Not a global or current value.",
          "sourceUrls": [
            "https://science.nasa.gov/solar-system/planets/saturn/saturn-moons/the-way-the-wind-blows-on-titan/"
          ]
        }
      ],
      "points": [
        {
          "id": "kraken",
          "name": "Kraken Mare",
          "kind": "surface-feature",
          "latitude": 68,
          "longitude": 50,
          "description": "A major hydrocarbon sea in Titan’s northern polar region.",
          "whyInteresting": "Cassini infrared views revealed shorelines through the haze; this center marker is not a live shoreline map.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14399",
            "https://science.nasa.gov/resource/titan-kraken-and-ligeia-in-sharper-focus/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 14399; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 310.00° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "ligeia",
          "name": "Ligeia Mare",
          "kind": "surface-feature",
          "latitude": 79.7,
          "longitude": 112.1,
          "description": "A northern sea whose methane-rich liquid was studied by Cassini radar.",
          "whyInteresting": "Historical radar measurements distinguish a physical sea from a dark albedo feature.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14400",
            "https://www.jpl.nasa.gov/news/cassini-explores-a-methane-sea-on-titan/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 14400; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 247.90° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "shangri-la",
          "name": "Shangri-La",
          "kind": "surface-feature",
          "latitude": -10,
          "longitude": -165,
          "description": "An officially named low-latitude dark albedo region.",
          "whyInteresting": "Shows the equatorial terrain in contrast with the northern seas.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6990"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6990; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 165.00° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "iapetus",
      "name": "Iapetus",
      "category": "moon",
      "parentId": "saturn",
      "description": "A slowly rotating Saturnian moon with strikingly dark and bright hemispheres and evidence of thermal ice migration.",
      "mapping": {
        "kind": "surface",
        "note": "Static visible-light surface mosaic showing the real dark/bright hemispheric contrast. Source seams, uneven resolution, changing illumination and limited polar detail remain visible. NASA/JPL-Caltech/Space Science Institute; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/iapetus_cassini_voyager_global_mosaic_803m"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Solar heating and ice sublimation help explain the brightness contrast. The atmospheric-weather layers are absent; temperatures quoted here come from a dated Cassini scene.",
        "sourceUrls": [
          "https://science.nasa.gov/saturn/moons/iapetus/",
          "https://science.nasa.gov/saturn/moons/titan/facts/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Saturn",
          "semantics": "reference",
          "context": "Natural satellite; standalone surface-atlas target.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/iapetus/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "734.3 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.224 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "1903.924 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Saturn.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Saturn",
          "value": "79.330183 Earth days",
          "semantics": "reference",
          "context": "Sidereal period, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/saturniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No substantial atmosphere",
          "semantics": "reference",
          "context": "Surface-dominated reference world.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/iapetus/",
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Cassini noon temperatures",
          "value": "~130 K dark / ~100 K bright",
          "semantics": "historical",
          "context": "31 December 2004 scene: latitude and albedo differ between sampled terrains.",
          "sourceUrls": [
            "https://science.nasa.gov/resource/iapetus-temperature-map/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure context",
          "value": "No dense-air surface-pressure datum",
          "semantics": "reference",
          "context": "No numerical global pressure is assigned to this surface.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/iapetus/",
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "Not applicable to ordinary air weather",
          "semantics": "reference",
          "context": "Thermal segregation moves volatile ice by sublimation; it is not an Earth-style wind map.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/iapetus/"
          ]
        }
      ],
      "points": [
        {
          "id": "cassini-regio",
          "name": "Cassini Regio",
          "kind": "surface-feature",
          "latitude": -28.1,
          "longitude": -92.6,
          "description": "The named region associated with Iapetus’s dark hemisphere.",
          "whyInteresting": "Connects the albedo contrast to the slow thermal cycle; the marker is a regional center.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/1047",
            "https://science.nasa.gov/saturn/moons/iapetus/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 1047; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 92.60° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "roncevaux",
          "name": "Roncevaux Terra",
          "kind": "surface-feature",
          "latitude": 37,
          "longitude": 120.5,
          "description": "An extensive named terrain region on Iapetus’s opposite hemisphere.",
          "whyInteresting": "A regional landmark for comparing the globe’s contrasting hemispheres.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/5181"
          ],
          "coordinateNotes": "USGS displayed default, geometry 5181; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 239.50° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "engelier",
          "name": "Engelier",
          "kind": "surface-feature",
          "latitude": -40.5,
          "longitude": 95.3,
          "description": "A very large named impact crater at southern latitudes.",
          "whyInteresting": "Shows the impact history preserved by this distant icy moon.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14463"
          ],
          "coordinateNotes": "USGS displayed default, geometry 14463; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 264.70° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "charon",
      "name": "Charon",
      "category": "moon",
      "parentId": "pluto",
      "description": "Pluto’s large companion is mutually tidally locked with the dwarf planet; its icy surface records major fractures and mountainous terrain.",
      "mapping": {
        "kind": "surface",
        "note": "Static LORRI/MVIC grayscale surface mosaic with highly uneven encounter coverage and resolution. Black regions and the gray far-southern cap mark missing data, not dark terrain; other ragged coverage gaps remain visible. NASA/JHUAPL/SwRI/LPI; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/charon_new_horizons_lorri_mvic_global_mosaic_300m"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Reference surface environment only. No current atmosphere, pressure, thermal or wind product is available here; tabulated values retain their cited context.",
        "sourceUrls": [
          "https://science.nasa.gov/dwarf-planets/pluto/moons/charon/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Pluto",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/dwarf-planets/pluto/moons/charon/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "606 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.289 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "153.293 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Pluto; reference period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/plutofact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Pluto",
          "value": "6.3872 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the named parent, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/plutofact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No substantial atmosphere",
          "semantics": "reference",
          "context": "NASA 2017 airless surface treatment.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "temperature",
          "label": "Design-study surface temperature",
          "value": "53 K",
          "semantics": "reference",
          "context": "2017 engineering reference; not a current global measurement.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface-pressure knowledge",
          "value": "No global pressure value assigned",
          "semantics": "reference",
          "context": "No mapped or current pressure product is inferred from surface imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/dwarf-planets/pluto/moons/charon/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No ordinary wind-weather field",
          "semantics": "reference",
          "context": "The atlas supplies reference geology, not a current atmosphere simulation.",
          "sourceUrls": [
            "https://science.nasa.gov/dwarf-planets/pluto/moons/charon/"
          ]
        }
      ],
      "points": [
        {
          "id": "argo",
          "name": "Argo Chasma",
          "kind": "surface-feature",
          "latitude": 27.8,
          "longitude": 80.4,
          "description": "An officially named northern chasm.",
          "whyInteresting": "A regional center for comparing Charon’s fractured terrain with its mountains and craters.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/15734"
          ],
          "coordinateNotes": "USGS displayed default, geometry 45602; planetocentric latitude; longitude normalized to east-positive −180…180 from 80.40° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "clarke",
          "name": "Clarke Montes",
          "kind": "surface-feature",
          "latitude": -5.12,
          "longitude": 7.05,
          "description": "A named group of mountains just south of the equator.",
          "whyInteresting": "A mountainous reference target distinct from the neighboring chasm and crater markers.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/15737"
          ],
          "coordinateNotes": "USGS displayed default, geometry 45605; planetocentric latitude; longitude normalized to east-positive −180…180 from 7.05° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "nemo",
          "name": "Nemo",
          "kind": "surface-feature",
          "latitude": -15.7,
          "longitude": -45.9,
          "description": "A named impact crater in Charon’s southern hemisphere.",
          "whyInteresting": "Its approved name connects the surface atlas with the Gazetteer’s exploration-literature theme.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/15743"
          ],
          "coordinateNotes": "USGS displayed default, geometry 45611; planetocentric latitude; longitude normalized to east-positive −180…180 from 314.10° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "phobos",
      "name": "Phobos",
      "category": "moon",
      "parentId": "mars",
      "description": "Mars’s larger inner moon is an irregular, dusty, heavily cratered body dominated by Stickney and cut by long grooves.",
      "mapping": {
        "kind": "surface",
        "note": "Static mosaic combining 26 Mars Express SRC and eight Viking images. Lighting, sharpness and source shadows vary; Phobos is irregularly shaped, so this spherical overview is not a terrain or shape model. ESA/DLR/Mars Express HRSC team; NASA/Viking; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/phobos_mars_express_src_global_mosaic_12m"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Reference surface environment only. No current atmosphere, pressure, thermal or wind product is available here; tabulated values retain their cited context.",
        "sourceUrls": [
          "https://science.nasa.gov/mars/moons/phobos/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Mars",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/mars/moons/phobos/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "11.08 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.0058 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "7.654 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Mars; reference period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Mars",
          "value": "0.31891 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the named parent, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No atmosphere",
          "semantics": "reference",
          "context": "Surface heating is not buffered by a dense gaseous envelope.",
          "sourceUrls": [
            "https://science.nasa.gov/mars/moons/phobos/"
          ]
        },
        {
          "id": "temperature",
          "label": "Measured illumination contrast",
          "value": "~161–269 K",
          "semantics": "measured",
          "context": "NASA reference night-to-day values (−112 to −4 °C); fine regolith loses heat rapidly.",
          "sourceUrls": [
            "https://science.nasa.gov/mars/moons/phobos/"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface-pressure knowledge",
          "value": "No global pressure value assigned",
          "semantics": "reference",
          "context": "No mapped or current pressure product is inferred from surface imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/mars/moons/phobos/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No ordinary wind-weather field",
          "semantics": "reference",
          "context": "The atlas supplies reference geology, not a current atmosphere simulation.",
          "sourceUrls": [
            "https://science.nasa.gov/mars/moons/phobos/"
          ]
        }
      ],
      "points": [
        {
          "id": "stickney",
          "name": "Stickney",
          "kind": "surface-feature",
          "latitude": 1,
          "longitude": -49,
          "description": "The large impact crater dominating many views of Phobos.",
          "whyInteresting": "A prominent landmark for exploring how a major impact affects a very small moon.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/5707",
            "https://science.nasa.gov/mars/moons/phobos/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 5707; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 49.00° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "hall",
          "name": "Hall",
          "kind": "surface-feature",
          "latitude": -80,
          "longitude": 150,
          "description": "A named crater close to Phobos’s south polar region.",
          "whyInteresting": "Shows a different part of the irregular moon from the more familiar Stickney hemisphere.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/2328"
          ],
          "coordinateNotes": "USGS displayed default, geometry 2328; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 210.00° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "roche",
          "name": "Roche",
          "kind": "surface-feature",
          "latitude": 53,
          "longitude": 177,
          "description": "A named impact crater at northern latitudes.",
          "whyInteresting": "A northern counterpart to Hall’s southern location.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/5167"
          ],
          "coordinateNotes": "USGS displayed default, geometry 5167; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 183.00° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "deimos",
      "name": "Deimos",
      "category": "moon",
      "parentId": "mars",
      "description": "Mars’s small outer moon has a dusty, comparatively smooth appearance where regolith partly fills older impact craters.",
      "mapping": {
        "kind": "surface",
        "note": "Static Viking imagery processed by USGS and published as a planetary texture by NASA. Resolution, illumination and seams vary; the spherical overview does not represent the irregular moon’s measured shape. NASA/JPL/Solar System Simulator; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://science.nasa.gov/3d-resources/mars-deimos/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Reference surface environment only. No current atmosphere, pressure, thermal or wind product is available here; tabulated values retain their cited context.",
        "sourceUrls": [
          "https://science.nasa.gov/mars/moons/deimos/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Mars",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/mars/moons/deimos/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "6.2 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.0025 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "30.299 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Mars; reference period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Mars",
          "value": "1.26244 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the named parent, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere context",
          "value": "No substantial atmosphere",
          "semantics": "reference",
          "context": "No dense-air weather system; sparse gas would not be ordinary atmospheric weather.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Study temperature reference",
          "value": "~233 K (−40 °C)",
          "semantics": "reference",
          "context": "2012 NASA sample-collection study reference; not a full day/night range or current reading.",
          "sourceUrls": [
            "https://ntrs.nasa.gov/api/citations/20120013420/downloads/20120013420.pdf"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface-pressure knowledge",
          "value": "No global pressure value assigned",
          "semantics": "reference",
          "context": "No mapped or current pressure product is inferred from surface imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/mars/moons/deimos/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No ordinary wind-weather field",
          "semantics": "reference",
          "context": "The atlas supplies reference geology, not a current atmosphere simulation.",
          "sourceUrls": [
            "https://science.nasa.gov/mars/moons/deimos/"
          ]
        }
      ],
      "points": [
        {
          "id": "swift",
          "name": "Swift",
          "kind": "surface-feature",
          "latitude": 12.5,
          "longitude": 1.8,
          "description": "One of Deimos’s two IAU-approved named craters.",
          "whyInteresting": "The complete named-feature catalog is small; no extra crater names are invented.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/5789"
          ],
          "coordinateNotes": "USGS displayed default, geometry 5789; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 358.20° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "voltaire",
          "name": "Voltaire",
          "kind": "surface-feature",
          "latitude": 22,
          "longitude": -3.5,
          "description": "The other IAU-approved named crater on Deimos.",
          "whyInteresting": "Its name follows the literary theme of Deimos’s small approved crater catalog.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6431"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6431; planetographic latitude; west-positive longitude converted to east-positive −180…180 from 3.50° west. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "miranda",
      "name": "Miranda",
      "category": "moon",
      "parentId": "uranus",
      "description": "A small Uranian moon with sharply contrasting terrains, huge fault scarps and three unusual ridged regions called coronae.",
      "mapping": {
        "kind": "surface",
        "note": "Static 1986 Voyager mosaic covering predominantly southern terrain. Black areas and the gray far-northern cap are unknown coverage, not surface color. Sharpness varies and no missing geography is reconstructed. USGS/Tammy Becker & JPL/Caltech; NASA. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://science.nasa.gov/3d-resources/uranus-miranda/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Reference surface environment only. No current atmosphere, pressure, thermal or wind product is available here; tabulated values retain their cited context.",
        "sourceUrls": [
          "https://science.nasa.gov/uranus/moons/miranda/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Uranus",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/miranda/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "235.8 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.077 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "33.923 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Uranus; reference period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Uranus",
          "value": "1.413479 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the named parent, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmospheric reference",
          "value": "Airless thermal approximation",
          "semantics": "reference",
          "context": "2017 design treatment; tenuous exospheres are not excluded.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "temperature",
          "label": "Design-study mean surface temperature",
          "value": "60 K",
          "semantics": "reference",
          "context": "2017 Table F-2 reference mean; not a full measured range or current conditions.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface-pressure knowledge",
          "value": "No global pressure value assigned",
          "semantics": "reference",
          "context": "No mapped or current pressure product is inferred from surface imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/miranda/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No ordinary wind-weather field",
          "semantics": "reference",
          "context": "The atlas supplies reference geology, not a current atmosphere simulation.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/miranda/"
          ]
        }
      ],
      "points": [
        {
          "id": "verona",
          "name": "Verona Rupes",
          "kind": "surface-feature",
          "latitude": -18.3,
          "longitude": -12.2,
          "description": "An officially named fault-scarp region.",
          "whyInteresting": "Its geographic setting links the globe to Miranda’s striking cliff landscapes.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6359"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6359; planetocentric latitude; longitude normalized to east-positive −180…180 from 347.80° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "inverness",
          "name": "Inverness Corona",
          "kind": "surface-feature",
          "latitude": -66.9,
          "longitude": -34.3,
          "description": "A large named corona in the southern hemisphere.",
          "whyInteresting": "One of the unusual ridged terrain regions that make Miranda geologically distinctive.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/2704"
          ],
          "coordinateNotes": "USGS displayed default, geometry 2704; planetocentric latitude; longitude normalized to east-positive −180…180 from 325.70° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "arden",
          "name": "Arden Corona",
          "kind": "surface-feature",
          "latitude": -29.1,
          "longitude": 73.7,
          "description": "A second officially named corona.",
          "whyInteresting": "Compare separated corona centers without treating either marker as a complete boundary.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/353"
          ],
          "coordinateNotes": "USGS displayed default, geometry 353; planetocentric latitude; longitude normalized to east-positive −180…180 from 73.70° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "ariel",
      "name": "Ariel",
      "category": "moon",
      "parentId": "uranus",
      "description": "A bright Uranian moon with a porous icy surface, fault-bounded valleys and evidence of past geological resurfacing.",
      "mapping": {
        "kind": "surface",
        "note": "Static 1986 Voyager mosaic of predominantly southern terrain, with uneven detail and lighting. Black areas and the gray far-northern cap mark unknown coverage; the remaining black gaps are retained. USGS/Tammy Becker & JPL/Caltech; NASA. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://science.nasa.gov/3d-resources/uranus-ariel/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Reference surface environment only. No current atmosphere, pressure, thermal or wind product is available here; tabulated values retain their cited context.",
        "sourceUrls": [
          "https://science.nasa.gov/uranus/moons/ariel/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Uranus",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/ariel/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "578.9 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.249 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "60.489 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Uranus; reference period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Uranus",
          "value": "2.520379 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the named parent, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmospheric reference",
          "value": "Airless thermal approximation",
          "semantics": "reference",
          "context": "2017 design treatment; tenuous exospheres are not excluded.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "temperature",
          "label": "Design-study mean surface temperature",
          "value": "59 K",
          "semantics": "reference",
          "context": "2017 Table F-2 reference mean; not a full measured range or current conditions.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface-pressure knowledge",
          "value": "No global pressure value assigned",
          "semantics": "reference",
          "context": "No mapped or current pressure product is inferred from surface imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/ariel/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No ordinary wind-weather field",
          "semantics": "reference",
          "context": "The atlas supplies reference geology, not a current atmosphere simulation.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/ariel/"
          ]
        }
      ],
      "points": [
        {
          "id": "kachina",
          "name": "Kachina Chasmata",
          "kind": "surface-feature",
          "latitude": -33.7,
          "longitude": -114,
          "description": "An extensive named chasm system in Ariel’s southern hemisphere.",
          "whyInteresting": "An anchor for exploring fault-related landforms rather than only impact craters.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/2879"
          ],
          "coordinateNotes": "USGS displayed default, geometry 2879; planetocentric latitude; longitude normalized to east-positive −180…180 from 246.00° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "yangoor",
          "name": "Yangoor",
          "kind": "surface-feature",
          "latitude": -68.7,
          "longitude": -80.3,
          "description": "A named crater at high southern latitude.",
          "whyInteresting": "A polar-region landmark on the Voyager-imaged hemisphere.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6638"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6638; planetocentric latitude; longitude normalized to east-positive −180…180 from 279.70° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "laica",
          "name": "Laica",
          "kind": "surface-feature",
          "latitude": -21.3,
          "longitude": 44.4,
          "description": "An officially named crater farther from the south pole.",
          "whyInteresting": "A contrasting lower-latitude crater reference.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3236"
          ],
          "coordinateNotes": "USGS displayed default, geometry 3236; planetocentric latitude; longitude normalized to east-positive −180…180 from 44.40° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "umbriel",
      "name": "Umbriel",
      "category": "moon",
      "parentId": "uranus",
      "description": "A dark, heavily cratered Uranian moon whose Voyager-imaged hemisphere includes the distinctive bright-ringed Wunda crater.",
      "mapping": {
        "kind": "surface",
        "note": "Static, coarse 1986 Voyager mosaic with predominantly southern coverage. Black areas and the gray far-northern cap are unknown; apparent smoothness can reflect limited image detail. No borrowed or invented terrain fills the gaps. USGS/Tammy Becker & JPL/Caltech; NASA. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://science.nasa.gov/3d-resources/uranus-umbriel/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Reference surface environment only. No current atmosphere, pressure, thermal or wind product is available here; tabulated values retain their cited context.",
        "sourceUrls": [
          "https://science.nasa.gov/uranus/moons/umbriel/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Uranus",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/umbriel/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "584.7 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.249 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "99.460 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Uranus; reference period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Uranus",
          "value": "4.144176 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the named parent, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmospheric reference",
          "value": "Airless thermal approximation",
          "semantics": "reference",
          "context": "2017 design treatment; tenuous exospheres are not excluded.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "temperature",
          "label": "Design-study mean surface temperature",
          "value": "63 K",
          "semantics": "reference",
          "context": "2017 Table F-2 reference mean; not a full measured range or current conditions.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface-pressure knowledge",
          "value": "No global pressure value assigned",
          "semantics": "reference",
          "context": "No mapped or current pressure product is inferred from surface imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/umbriel/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No ordinary wind-weather field",
          "semantics": "reference",
          "context": "The atlas supplies reference geology, not a current atmosphere simulation.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/umbriel/"
          ]
        }
      ],
      "points": [
        {
          "id": "wunda",
          "name": "Wunda",
          "kind": "surface-feature",
          "latitude": -7.9,
          "longitude": -86.4,
          "description": "A named crater associated with Umbriel’s conspicuous bright ring.",
          "whyInteresting": "The light material contrasts with the moon’s generally dark surface.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6587",
            "https://science.nasa.gov/uranus/moons/umbriel/"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6587; planetocentric latitude; longitude normalized to east-positive −180…180 from 273.60° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "vuver",
          "name": "Vuver",
          "kind": "surface-feature",
          "latitude": -4.7,
          "longitude": -48.4,
          "description": "An officially named crater near Umbriel’s equator.",
          "whyInteresting": "A neighboring crater reference for comparing the mapped terrain.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6460"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6460; planetocentric latitude; longitude normalized to east-positive −180…180 from 311.60° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "skynd",
          "name": "Skynd",
          "kind": "surface-feature",
          "latitude": -1.8,
          "longitude": -28.3,
          "description": "Another approved low-latitude crater.",
          "whyInteresting": "Completes a set of actual named landmarks within the limited imaged geography.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/5595"
          ],
          "coordinateNotes": "USGS displayed default, geometry 5595; planetocentric latitude; longitude normalized to east-positive −180…180 from 331.70° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "titania",
      "name": "Titania",
      "category": "moon",
      "parentId": "uranus",
      "description": "Uranus’s largest moon preserves broad fault valleys and cratered terrain imaged during Voyager 2’s 1986 encounter.",
      "mapping": {
        "kind": "surface",
        "note": "Static 1986 Voyager mosaic with predominantly southern coverage and large changes in resolution and lighting. Black areas and the gray far-northern cap indicate unknown coverage; the texture is not a complete geographic survey. USGS/Tammy Becker & JPL/Caltech; NASA. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://science.nasa.gov/3d-resources/uranus-titania/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Reference surface environment only. No current atmosphere, pressure, thermal or wind product is available here; tabulated values retain their cited context.",
        "sourceUrls": [
          "https://science.nasa.gov/uranus/moons/titania/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Uranus",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/titania/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "788.9 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.365 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "208.941 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Uranus; reference period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Uranus",
          "value": "8.705867 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the named parent, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmospheric reference",
          "value": "Airless thermal approximation",
          "semantics": "reference",
          "context": "2017 design treatment; tenuous exospheres are not excluded.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "temperature",
          "label": "Design-study mean surface temperature",
          "value": "60 K",
          "semantics": "reference",
          "context": "2017 Table F-2 reference mean; not a full measured range or current conditions.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface-pressure knowledge",
          "value": "No global pressure value assigned",
          "semantics": "reference",
          "context": "No mapped or current pressure product is inferred from surface imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/titania/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No ordinary wind-weather field",
          "semantics": "reference",
          "context": "The atlas supplies reference geology, not a current atmosphere simulation.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/titania/"
          ]
        }
      ],
      "points": [
        {
          "id": "gertrude",
          "name": "Gertrude",
          "kind": "surface-feature",
          "latitude": -15.8,
          "longitude": -72.9,
          "description": "A large approved impact-crater landmark.",
          "whyInteresting": "A useful scale reference beside Titania’s extended tectonic features.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/2150"
          ],
          "coordinateNotes": "USGS displayed default, geometry 2150; planetocentric latitude; longitude normalized to east-positive −180…180 from 287.10° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "messina",
          "name": "Messina Chasmata",
          "kind": "surface-feature",
          "latitude": -33.3,
          "longitude": -25,
          "description": "An extensive named system of chasms.",
          "whyInteresting": "The center marker represents a long regional landform rather than a compact crater.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3870"
          ],
          "coordinateNotes": "USGS displayed default, geometry 3870; planetocentric latitude; longitude normalized to east-positive −180…180 from 335.00° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "ursula",
          "name": "Ursula",
          "kind": "surface-feature",
          "latitude": -12.4,
          "longitude": 45.2,
          "description": "A named crater on the mapped southern hemisphere.",
          "whyInteresting": "A second impact landmark separated from Gertrude.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6245"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6245; planetocentric latitude; longitude normalized to east-positive −180…180 from 45.20° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "oberon",
      "name": "Oberon",
      "category": "moon",
      "parentId": "uranus",
      "description": "Uranus’s outermost major moon is an ancient cratered ice-and-rock world seen at limited resolution by Voyager 2.",
      "mapping": {
        "kind": "surface",
        "note": "Static, coarse 1986 Voyager mosaic of predominantly southern terrain. Black areas and the gray far-northern cap mark unknown coverage. Image blur, illumination and seams are retained; no missing geography is filled. USGS/Tammy Becker & JPL/Caltech; NASA. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://science.nasa.gov/3d-resources/uranus-oberon/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Reference surface environment only. No current atmosphere, pressure, thermal or wind product is available here; tabulated values retain their cited context.",
        "sourceUrls": [
          "https://science.nasa.gov/uranus/moons/oberon/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Uranus",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/oberon/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "761.4 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.354 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "323.118 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Uranus; reference period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Uranus",
          "value": "13.463234 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the named parent, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmospheric reference",
          "value": "Airless thermal approximation",
          "semantics": "reference",
          "context": "2017 design treatment; tenuous exospheres are not excluded.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "temperature",
          "label": "Design-study mean surface temperature",
          "value": "73 K",
          "semantics": "reference",
          "context": "2017 Table F-2 reference mean; not a full measured range or current conditions.",
          "sourceUrls": [
            "https://science.nasa.gov/wp-content/uploads/2024/02/rtg-study-d-99657-final-report-june-2017-export-marking-updated1.pdf"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface-pressure knowledge",
          "value": "No global pressure value assigned",
          "semantics": "reference",
          "context": "No mapped or current pressure product is inferred from surface imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/oberon/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No ordinary wind-weather field",
          "semantics": "reference",
          "context": "The atlas supplies reference geology, not a current atmosphere simulation.",
          "sourceUrls": [
            "https://science.nasa.gov/uranus/moons/oberon/"
          ]
        }
      ],
      "points": [
        {
          "id": "hamlet",
          "name": "Hamlet",
          "kind": "surface-feature",
          "latitude": -46.1,
          "longitude": 44.4,
          "description": "A named southern impact crater.",
          "whyInteresting": "A major recognizable name within Oberon’s Shakespearean nomenclature.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/2340"
          ],
          "coordinateNotes": "USGS displayed default, geometry 2340; planetocentric latitude; longitude normalized to east-positive −180…180 from 44.40° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "macbeth",
          "name": "Macbeth",
          "kind": "surface-feature",
          "latitude": -58.4,
          "longitude": 112.5,
          "description": "Another approved crater at high southern latitude.",
          "whyInteresting": "A geographically separated impact landmark on the imaged hemisphere.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3552"
          ],
          "coordinateNotes": "USGS displayed default, geometry 3552; planetocentric latitude; longitude normalized to east-positive −180…180 from 112.50° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "mommur",
          "name": "Mommur Chasma",
          "kind": "surface-feature",
          "latitude": -16.3,
          "longitude": -36.5,
          "description": "An officially named chasm.",
          "whyInteresting": "Adds a tectonic-landform reference to the crater pair.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3958"
          ],
          "coordinateNotes": "USGS displayed default, geometry 3958; planetocentric latitude; longitude normalized to east-positive −180…180 from 323.50° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "triton",
      "name": "Triton",
      "category": "moon",
      "parentId": "neptune",
      "description": "Neptune’s largest moon follows a retrograde orbit and has a cold nitrogen-frost surface, thin atmosphere and historically observed plumes.",
      "mapping": {
        "kind": "surface",
        "note": "Static 1989 Voyager mosaic combining orange, violet and ultraviolet images into enhanced color. Black regions and the gray far-northern cap are unobserved coverage, not surface color. Detail varies; this is not live plume imagery. NASA/JPL-Caltech/LPI/Paul Schenk; USGS. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/triton_voyager_2_global_color_mosaic_600m"
        ]
      },
      "weather": {
        "mode": "climatology",
        "summary": "Thin nitrogen air and historical plume transport are reference science. Pressure, temperature and winds are not current observations or live layers.",
        "sourceUrls": [
          "https://science.nasa.gov/neptune/moons/triton/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Neptune",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/moons/triton/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "1,352.6 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.781 m/s²",
          "semantics": "reference",
          "context": "Approximate GM/r²; spherical, not local.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation",
          "value": "141.044 h · synchronous",
          "semantics": "reference",
          "context": "Same face toward Neptune; reference period.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptuniansatfact.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Neptune",
          "value": "5.876854 Earth days",
          "semantics": "reference",
          "context": "Retrograde orbit around Neptune, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptuniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Thin nitrogen with methane",
          "semantics": "reference",
          "context": "Reference atmosphere over volatile surface ices; seasonal changes are possible.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/moons/triton/"
          ]
        },
        {
          "id": "temperature",
          "label": "Voyager-era daytime surface",
          "value": "~38 K",
          "semantics": "historical",
          "context": "1990 analysis of Voyager observations; not current conditions.",
          "sourceUrls": [
            "https://ntrs.nasa.gov/citations/19900065503"
          ]
        },
        {
          "id": "pressure",
          "label": "Voyager-era surface pressure",
          "value": "~14 microbar (1.4 Pa)",
          "semantics": "historical",
          "context": "Reference inferred from Voyager-era atmospheric analysis, not a current pressure field.",
          "sourceUrls": [
            "https://ntrs.nasa.gov/citations/19900065503"
          ]
        },
        {
          "id": "winds",
          "label": "Historical plume transport",
          "value": "Southwesterly flow inferred from streaks",
          "semantics": "historical",
          "context": "25 August 1989 Voyager image interpretation; not a current wind map or measured global speed.",
          "sourceUrls": [
            "https://science.nasa.gov/photojournal/triton-south-polar-terrain/"
          ]
        }
      ],
      "points": [
        {
          "id": "leviathan",
          "name": "Leviathan Patera",
          "kind": "surface-feature",
          "latitude": 17,
          "longitude": 28.5,
          "description": "A named irregular depression on Triton.",
          "whyInteresting": "A reference anchor within the complex northern edge of the imaged terrain.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3368"
          ],
          "coordinateNotes": "USGS displayed default, geometry 3368; planetographic latitude; longitude normalized to east-positive −180…180 from 28.50° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "kibu",
          "name": "Kibu Patera",
          "kind": "surface-feature",
          "latitude": 10.5,
          "longitude": 43,
          "description": "Another officially named patera.",
          "whyInteresting": "Compare neighboring named depressions without implying active vents at their centers.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3022"
          ],
          "coordinateNotes": "USGS displayed default, geometry 3022; planetographic latitude; longitude normalized to east-positive −180…180 from 43.00° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        },
        {
          "id": "zin",
          "name": "Zin Maculae",
          "kind": "surface-feature",
          "latitude": -24.5,
          "longitude": 68,
          "description": "An approved group of dark surface markings.",
          "whyInteresting": "A southern albedo-feature reference distinct from the paterae.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6739"
          ],
          "coordinateNotes": "USGS displayed default, geometry 6739; planetographic latitude; longitude normalized to east-positive −180…180 from 68.00° E. Gazetteer feature center, not a surveyed boundary or spacecraft position."
        }
      ]
    },
    {
      "id": "proteus",
      "name": "Proteus",
      "category": "moon",
      "parentId": "neptune",
      "description": "A dark, irregular inner moon of Neptune, resolved only at limited detail by Voyager 2 and lacking a verified controlled global surface map.",
      "mapping": {
        "kind": "unmapped",
        "note": "Voyager 2 resolved limited visible terrain on Proteus, but no geographically registered surface map is provided here. The neutral globe is an illustration, not measured geography. Pharos has no usable published map coordinates in this atlas. NASA/JPL. Shape and orientation are illustrative. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://science.nasa.gov/neptune/moons/proteus/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Reference surface environment only. No current atmosphere, pressure, thermal or wind product is available here; tabulated values retain their cited context.",
        "sourceUrls": [
          "https://science.nasa.gov/neptune/moons/proteus/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Neptune",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/moons/proteus/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "208 km",
          "semantics": "reference",
          "context": "Mean-radius reference.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity (derived)",
          "value": "0.060 m/s²",
          "semantics": "reference",
          "context": "Weak spherical estimate: JPL GM uncertainty is about 94%; not a precise local gravity.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "IAU rotation reference",
          "value": "26.936 h",
          "semantics": "reference",
          "context": "Derived from the IAU reference meridian rate; the atlas does not compute a present orientation.",
          "sourceUrls": [
            "https://naif.jpl.nasa.gov/pub/naif/generic_kernels/pck/pck00011.tpc"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Neptune",
          "value": "1.122315 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the named parent, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptuniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere context",
          "value": "No substantial atmosphere",
          "semantics": "reference",
          "context": "No dense-air weather system; no current gas or weather observations are supplied.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Temperature knowledge",
          "value": "No mapped surface-temperature reference",
          "semantics": "reference",
          "context": "No global temperature value is assigned from the limited source imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/moons/proteus/"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface-pressure knowledge",
          "value": "No global pressure value assigned",
          "semantics": "reference",
          "context": "No mapped or current pressure product is inferred from surface imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/moons/proteus/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No ordinary wind-weather field",
          "semantics": "reference",
          "context": "The atlas supplies reference geology, not a current atmosphere simulation.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/moons/proteus/"
          ]
        }
      ],
      "points": [],
      "unlocatedFeatures": [
        {
          "id": "pharos",
          "name": "Pharos",
          "description": "An IAU-approved crater on Proteus, the dark, irregular moon photographed by Voyager 2 in 1989.",
          "whyInteresting": "A named crater gives context to Proteus’s heavily cratered surface. Reliable map coordinates are unavailable, so no geographic pin is shown.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/4684",
            "https://science.nasa.gov/neptune/moons/proteus/"
          ]
        }
      ]
    },
    {
      "id": "nereid",
      "name": "Nereid",
      "category": "moon",
      "parentId": "neptune",
      "description": "A distant Neptune moon with an unusually eccentric orbit; the Voyager image constrains overall appearance rather than mapped surface geography.",
      "mapping": {
        "kind": "unmapped",
        "note": "Voyager 2 recorded Nereid as only a few pixels across, without resolved geographic terrain. The neutral globe is an illustration; surface landmarks, map coordinates and a global texture are unavailable. NASA/JPL. Shape and orientation are illustrative. Atlas orientation does not claim a computed current sky position.",
        "sourceUrls": [
          "https://science.nasa.gov/photojournal/nereid/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Reference surface environment only. No current atmosphere, pressure, thermal or wind product is available here; tabulated values retain their cited context.",
        "sourceUrls": [
          "https://science.nasa.gov/neptune/moons/nereid/"
        ]
      },
      "facts": [
        {
          "id": "parent",
          "label": "Parent",
          "value": "Neptune",
          "semantics": "reference",
          "context": "Natural satellite; standalone reference atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/moons/nereid/"
          ]
        },
        {
          "id": "radius",
          "label": "Mean radius",
          "value": "170 km",
          "semantics": "reference",
          "context": "JPL reference radius; uncertainty ±25 km.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "gravity",
          "label": "Gravity knowledge",
          "value": "Not determined",
          "semantics": "reference",
          "context": "JPL lists no determined GM; its zero placeholder is not zero physical gravity.",
          "sourceUrls": [
            "https://ssd.jpl.nasa.gov/sats/phys_par/"
          ]
        },
        {
          "id": "rotation",
          "label": "IAU rotation-model coverage",
          "value": "No IAU orientation model supplied",
          "semantics": "reference",
          "context": "The cited kernel omits Nereid and states it is not synchronous; no period is invented from its orbit.",
          "sourceUrls": [
            "https://naif.jpl.nasa.gov/pub/naif/generic_kernels/pck/pck00011.tpc"
          ]
        },
        {
          "id": "orbit",
          "label": "Orbit around Neptune",
          "value": "360.13619 Earth days",
          "semantics": "reference",
          "context": "Sidereal orbit around the named parent, not a solar year.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/planetary/factsheet/neptuniansatfact.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere context",
          "value": "No substantial atmosphere",
          "semantics": "reference",
          "context": "No dense-air weather system; detailed gas conditions are not measured here.",
          "sourceUrls": [
            "https://science.nasa.gov/saturn/moons/titan/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Temperature knowledge",
          "value": "No resolved surface-temperature map",
          "semantics": "reference",
          "context": "No geographical thermal values are inferred from the coarse Voyager image.",
          "sourceUrls": [
            "https://science.nasa.gov/resource/nereid/"
          ]
        },
        {
          "id": "pressure",
          "label": "Surface-pressure knowledge",
          "value": "No global pressure value assigned",
          "semantics": "reference",
          "context": "No mapped or current pressure product is inferred from surface imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/moons/nereid/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No ordinary wind-weather field",
          "semantics": "reference",
          "context": "The atlas supplies reference geology, not a current atmosphere simulation.",
          "sourceUrls": [
            "https://science.nasa.gov/neptune/moons/nereid/"
          ]
        }
      ],
      "points": []
    },
    {
      "id": "ceres",
      "name": "Ceres",
      "category": "dwarf-planet",
      "parentId": "sun",
      "minorPlanetNumber": 1,
      "description": "The largest main-belt object is a dwarf planet with a water-rich interior, salt deposits and signs of past brine activity explored by Dawn.",
      "mapping": {
        "kind": "surface",
        "note": "Dawn controlled surface photomosaic with east-positive coordinates. Surface imagery is static; its illumination is not the current solar direction. Static 2015 Dawn Framing Camera surface mosaic published by DLR/USGS in 2016. Resolution, lighting and seams vary; black source coverage gaps remain unknown. The spherical overview is not a terrain model. NASA/JPL-Caltech/UCLA/MPS/DLR/IDA; USGS.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/ceres_dawn_fc_global_mosaic_140m",
          "https://planetarynames.wr.usgs.gov/Page/CERES/target"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Ceres has a very tenuous water-vapor environment, without an Earth-like weather system. Dawn geography and atmospheric references are historical, with no live clouds, precipitation or wind layer.",
        "sourceUrls": [
          "https://science.nasa.gov/dwarf-planets/ceres/facts/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "469.7 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (939.4 km). This size reference is not a local shape radius. Diameter-derived radius uncertainty ±0.1 km (quoted source sigma).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=1&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "0.2839 m/s²",
          "semantics": "reference",
          "context": "Calculated as GM/r² from JPL GM=62.6284 km³/s² and effective radius. Ignores irregular shape and centrifugal acceleration. Quoted GM sigma 0.0009 km³/s². Selected catalog GM reference: Nature vol. 537, pp515-517 (22 September 2016).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=1&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "9.07417 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. Quoted period sigma 0.000001 h.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=1&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false. Ceres retains its dwarf-planet classification.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=1&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1679.853 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=1&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "Very tenuous water-vapor environment",
          "semantics": "reference",
          "context": "NASA reports evidence for water vapor around Ceres. This does not imply Earth-like weather or a stable global air-pressure field.",
          "sourceUrls": [
            "https://science.nasa.gov/dwarf-planets/ceres/facts/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://science.nasa.gov/dwarf-planets/ceres/facts/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://science.nasa.gov/dwarf-planets/ceres/facts/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://science.nasa.gov/dwarf-planets/ceres/facts/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.09",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.003.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=1&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII C · Tholen G",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=1&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1801-Jan-01",
          "semantics": "historical",
          "context": "Catalog discovery attribution: Piazzi, G., Palermo. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=1&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "exploration",
          "label": "Spacecraft exploration",
          "value": "Dawn · 2015–2018",
          "semantics": "historical",
          "context": "Historical orbital exploration; the surface map is assembled from mission imagery.",
          "sourceUrls": [
            "https://science.nasa.gov/dwarf-planets/ceres/facts/",
            "https://science.nasa.gov/mission/dawn/"
          ]
        }
      ],
      "points": [
        {
          "id": "occator",
          "name": "Occator",
          "kind": "surface-feature",
          "latitude": 19.82,
          "longitude": -120.67,
          "description": "An impact crater containing conspicuous bright salt deposits.",
          "whyInteresting": "Dawn’s observations connect these deposits with brines that reached the surface.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/15341",
            "https://www.nasa.gov/history/15-years-ago-dawn-begins-voyage-to-asteroid-vesta-and-dwarf-planet-ceres/"
          ],
          "coordinateNotes": "Planetocentric latitude; east-positive longitude normalized to −180…180. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        },
        {
          "id": "ahuna-mons",
          "name": "Ahuna Mons",
          "kind": "surface-feature",
          "latitude": -10.48,
          "longitude": -43.8,
          "description": "An isolated mountain interpreted from Dawn observations as a salty-mud cryovolcanic dome.",
          "whyInteresting": "It records an unusual form of volcanism involving icy, salty material.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/15409",
            "https://www.nasa.gov/missions/nasa-discovers-lonely-mountain-on-ceres-likely-a-salty-mud-cryovolcano/"
          ],
          "coordinateNotes": "Planetocentric latitude; east-positive longitude normalized to −180…180. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        },
        {
          "id": "kerwan",
          "name": "Kerwan",
          "kind": "surface-feature",
          "latitude": -10.77,
          "longitude": 123.99,
          "description": "A broad named impact crater centered south of Ceres’ equator.",
          "whyInteresting": "Its large footprint provides a useful contrast with smaller craters and the isolated Ahuna Mons.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/15339"
          ],
          "coordinateNotes": "Planetocentric latitude; east-positive longitude normalized to −180…180. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        }
      ],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 2.765552595034094,
        "eccentricity": 0.07969229514816586,
        "inclinationDeg": 10.58802780183462,
        "ascendingNodeDeg": 80.24862682043221,
        "argumentPerihelionDeg": 73.29421453021587,
        "meanAnomalyDeg": 274.4193463761342,
        "meanMotionDegPerDay": 0.21430445064843,
        "periodDays": 1679.853119758983,
        "solutionId": "48",
        "solutionDate": "2021-04-13 11:04:44",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=1&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "vesta",
      "name": "Vesta",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 4,
      "description": "A differentiated rocky body with a crust, mantle and core. Dawn mapped enormous impact basins and the source world of several meteorite groups.",
      "mapping": {
        "kind": "surface",
        "note": "Dawn reference mosaic in the IAU Claudia Double Prime frame; Claudia is at 146°E. No additional 150° longitude shift is applied. Surface imagery is static; its illumination is not the current solar direction. Static grayscale Dawn HAMO mosaic, already shifted by its publisher into the IAU Claudia Double Prime frame (Claudia at 146°E). The publisher filled a narrow wrap seam using neighboring pixels for artistic purposes; other coverage and lighting gaps remain. This spherical overview is not a terrain model. NASA/JPL-Caltech/UCLA/MPS/DLR/IDA; USGS.",
        "sourceUrls": [
          "https://astrogeology.usgs.gov/search/map/vesta_dawn_fc_hamo_global_mosaic_60m",
          "https://planetarynames.wr.usgs.gov/Page/VESTA/target"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "261.385 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (522.77 km). This size reference is not a local shape radius. Diameter-derived radius uncertainty ±0.05 km (quoted source sigma).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=4&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "0.253 m/s²",
          "semantics": "reference",
          "context": "Calculated as GM/r² from JPL GM=17.2882844 km³/s² and effective radius. Ignores irregular shape and centrifugal acceleration. Quoted GM sigma 0.0000030 km³/s². Selected catalog GM reference: Park, R.S. et al. 2025, Nat Astron, DOI: 10.1038/s41550-025-02533-7.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=4&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "5.342128 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. Quoted period sigma 0.0000000004 h.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=4&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=4&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1325.389 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=4&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.4228",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.053.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=4&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII V · Tholen V",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=4&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1807-Mar-29",
          "semantics": "historical",
          "context": "Catalog discovery attribution: Olbers, H. W., Bremen. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=4&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "exploration",
          "label": "Spacecraft exploration",
          "value": "Dawn · 2011–2012",
          "semantics": "historical",
          "context": "Dawn orbited Vesta from 16 July 2011 to 5 September 2012.",
          "sourceUrls": [
            "https://science.nasa.gov/solar-system/asteroids/4-vesta/"
          ]
        }
      ],
      "points": [
        {
          "id": "rheasilvia",
          "name": "Rheasilvia",
          "kind": "surface-feature",
          "latitude": -71.95,
          "longitude": 86.3,
          "description": "A vast impact basin spanning much of Vesta’s south polar region.",
          "whyInteresting": "The collision that made this basin helped reshape Vesta and produce debris related to its asteroid family.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14886",
            "https://science.nasa.gov/solar-system/asteroids/4-vesta/"
          ],
          "coordinateNotes": "IAU Coordinate System for (4) Vesta (Claudia Double Prime; Claudia=146°E). Planetocentric latitude; east-positive longitude normalized to −180…180. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        },
        {
          "id": "claudia",
          "name": "Claudia",
          "kind": "surface-feature",
          "latitude": -1.65,
          "longitude": 146,
          "description": "A small crater that defines longitude 146° east in the IAU coordinate system for Vesta.",
          "whyInteresting": "This reference landmark anchors the map’s geographic frame; it is not the zero meridian.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14877"
          ],
          "coordinateNotes": "IAU Coordinate System for (4) Vesta (Claudia Double Prime; Claudia=146°E). Planetocentric latitude; east-positive longitude normalized to −180…180. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        },
        {
          "id": "marcia",
          "name": "Marcia",
          "kind": "surface-feature",
          "latitude": 8.98,
          "longitude": -20.45,
          "description": "A named impact crater north of Vesta’s equator.",
          "whyInteresting": "Compare this compact crater with the far larger southern impact basin.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14882"
          ],
          "coordinateNotes": "IAU Coordinate System for (4) Vesta (Claudia Double Prime; Claudia=146°E). Planetocentric latitude; east-positive longitude normalized to −180…180. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        }
      ],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 2.361365965127599,
        "eccentricity": 0.09020374382834395,
        "inclinationDeg": 7.143925545058711,
        "ascendingNodeDeg": 103.701293265032,
        "argumentPerihelionDeg": 151.4686478221564,
        "meanAnomalyDeg": 81.19015607686903,
        "meanMotionDegPerDay": 0.2716183613599909,
        "periodDays": 1325.389042911101,
        "solutionId": "36",
        "solutionDate": "2021-04-13 11:15:57",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=4&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "pallas",
      "name": "Pallas",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 2,
      "description": "A large B-type asteroid whose orbit is tilted about 35 degrees to the ecliptic. Its high-inclination path stands out in the main belt.",
      "mapping": {
        "kind": "unmapped",
        "note": "No verified registered surface map is supplied. Neutral 3D shape and orientation are illustrative, with no geographic grid, coordinate probe or spatial pins.",
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=2&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "256.5 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (513 km). This size reference is not a local shape radius. Diameter-derived radius uncertainty ±3 km (quoted source sigma).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=2&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "0.2072 m/s²",
          "semantics": "reference",
          "context": "Calculated as GM/r² from JPL GM=13.63 km³/s² and effective radius. Ignores irregular shape and centrifugal acceleration. Quoted GM sigma 0.18 km³/s². Selected catalog GM reference: Vernazza et al., A&A 654, A56 (2021).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=2&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "7.813221 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. Quoted period sigma 0.000002 h.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=2&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=2&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1683.505 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=2&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.155",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=2&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII B · Tholen B",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=2&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1802-Mar-28",
          "semantics": "historical",
          "context": "Catalog discovery attribution: Olbers, H. W., Bremen. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=2&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        }
      ],
      "points": [],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 2.769559010737709,
        "eccentricity": 0.2307000995648547,
        "inclinationDeg": 34.93279321851542,
        "ascendingNodeDeg": 172.8866193357694,
        "argumentPerihelionDeg": 310.9699161652136,
        "meanAnomalyDeg": 254.2496521742734,
        "meanMotionDegPerDay": 0.2138396029251949,
        "periodDays": 1683.504809564834,
        "solutionId": "74",
        "solutionDate": "2026-06-05 03:03:25",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=2&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "hygiea",
      "name": "Hygiea",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 10,
      "description": "A large, dark C-type main-belt object. Telescope-derived physical properties are references; no registered surface geography is supplied here.",
      "mapping": {
        "kind": "unmapped",
        "note": "No verified registered surface map is supplied. Neutral 3D shape and orientation are illustrative, with no geographic grid, coordinate probe or spatial pins.",
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=10&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "203.56 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (407.12 km). This size reference is not a local shape radius. Diameter-derived radius uncertainty ±3.4 km (quoted source sigma).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=10&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "0.17 m/s²",
          "semantics": "reference",
          "context": "Calculated as GM/r² from JPL GM=7. km³/s² and effective radius. Ignores irregular shape and centrifugal acceleration. The catalog supplies no GM uncertainty; this is a coarse reference. Selected catalog GM reference: Scholl et al., A&A, v.179, p.311, 1987.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=10&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "13.828 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. No period uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=10&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=10&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "2042.987 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=10&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.0717",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.002.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=10&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII C · Tholen C",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=10&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1849-Apr-12",
          "semantics": "historical",
          "context": "Catalog discovery attribution: De Gasparis, A., Naples. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=10&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        }
      ],
      "points": [],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 3.150974033963701,
        "eccentricity": 0.1067092741240963,
        "inclinationDeg": 3.829529946447122,
        "ascendingNodeDeg": 283.1198927508594,
        "argumentPerihelionDeg": 312.4242387344704,
        "meanAnomalyDeg": 252.0344242359649,
        "meanMotionDegPerDay": 0.1762125505792448,
        "periodDays": 2042.987283349627,
        "solutionId": "129",
        "solutionDate": "2026-06-16 11:32:04",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=10&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "juno",
      "name": "Juno",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 3,
      "description": "The third asteroid discovered is an S/Sk spectral-class body on an eccentric main-belt orbit. Its displayed shape is illustrative.",
      "mapping": {
        "kind": "unmapped",
        "note": "No verified registered surface map is supplied. Neutral 3D shape and orientation are illustrative, with no geographic grid, coordinate probe or spatial pins.",
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=3&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "123.298 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (246.596 km). This size reference is not a local shape radius. Diameter-derived radius uncertainty ±5.297 km (quoted source sigma).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=3&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "Not determined in this reference",
          "semantics": "reference",
          "context": "JPL’s selected physical-parameter record supplies no GM here. No zero gravity or density-based mass is invented.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=3&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "7.21 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. No period uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=3&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=3&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1594.435 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=3&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.214",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.026.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=3&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII Sk · Tholen S",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=3&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1804-Sep-01",
          "semantics": "historical",
          "context": "Catalog discovery attribution: Harding, K., Lilienthal. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=3&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        }
      ],
      "points": [],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 2.670989527103278,
        "eccentricity": 0.2556999836681878,
        "inclinationDeg": 12.98659236598085,
        "ascendingNodeDeg": 169.8115953492418,
        "argumentPerihelionDeg": 247.8950743075613,
        "meanAnomalyDeg": 262.7322944883855,
        "meanMotionDegPerDay": 0.2257853690721904,
        "periodDays": 1594.434579527149,
        "solutionId": "144",
        "solutionDate": "2026-06-05 03:03:21",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=3&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "psyche",
      "name": "Psyche",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 16,
      "description": "A metal-rich, irregular main-belt asteroid that may contain both rock and metal. It is the target of NASA’s Psyche mission, rather than an already mapped world.",
      "mapping": {
        "kind": "unmapped",
        "note": "No verified registered surface map is supplied. Neutral 3D shape and orientation are illustrative, with no geographic grid, coordinate probe or spatial pins.",
        "sourceUrls": [
          "https://science.nasa.gov/solar-system/asteroids/16-psyche/"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "111 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (222 km). This size reference is not a local shape radius. No diameter uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=16&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "0.1299 m/s²",
          "semantics": "reference",
          "context": "Calculated as GM/r² from JPL GM=1.601 km³/s² and effective radius. Ignores irregular shape and centrifugal acceleration. Quoted GM sigma 0.017 km³/s². Selected catalog GM reference: Farnocchia et al. (2024), AJ 168, 21.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=16&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "4.196 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. No period uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=16&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=16&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1827.88 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=16&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.1203",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.004.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=16&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII X · Tholen M",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=16&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1852-Mar-17",
          "semantics": "historical",
          "context": "Catalog discovery attribution: De Gasparis, A., Naples. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=16&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "exploration",
          "label": "Spacecraft exploration",
          "value": "Arrival planned August 2029",
          "semantics": "reference",
          "context": "NASA’s published schedule as reviewed in October 2026; this is a plan, not a completed encounter.",
          "sourceUrls": [
            "https://science.nasa.gov/solar-system/asteroids/16-psyche/"
          ]
        }
      ],
      "points": [],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 2.925720466462538,
        "eccentricity": 0.1349324738201893,
        "inclinationDeg": 3.098749116151128,
        "ascendingNodeDeg": 149.9753859305033,
        "argumentPerihelionDeg": 230.0326782748359,
        "meanAnomalyDeg": 79.76939505329617,
        "meanMotionDegPerDay": 0.1969494758105845,
        "periodDays": 1827.87996016922,
        "solutionId": "92",
        "solutionDate": "2025-02-06 14:15:44",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=16&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "eunomia",
      "name": "Eunomia",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 15,
      "description": "A sizeable S-type asteroid in the main belt. Catalog spectra, reflected brightness and rotation measurements describe it without inventing geographic detail.",
      "mapping": {
        "kind": "unmapped",
        "note": "No verified registered surface map is supplied. Neutral 3D shape and orientation are illustrative, with no geographic grid, coordinate probe or spatial pins.",
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=15&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "115.844 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (231.689 km). This size reference is not a local shape radius. Diameter-derived radius uncertainty ±1.117 km (quoted source sigma).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=15&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "Not determined in this reference",
          "semantics": "reference",
          "context": "JPL’s selected physical-parameter record supplies no GM here. No zero gravity or density-based mass is invented.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=15&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "6.083 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. No period uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=15&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=15&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1568.511 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=15&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.248",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.042.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=15&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII S · Tholen S",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=15&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1851-Jul-29",
          "semantics": "historical",
          "context": "Catalog discovery attribution: De Gasparis, A., Naples. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=15&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        }
      ],
      "points": [],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 2.641958730730434,
        "eccentricity": 0.1877707677912555,
        "inclinationDeg": 11.76139314431215,
        "ascendingNodeDeg": 292.8807830122993,
        "argumentPerihelionDeg": 98.46131825798194,
        "meanAnomalyDeg": 159.6891049210672,
        "meanMotionDegPerDay": 0.2295170904959873,
        "periodDays": 1568.510646514552,
        "solutionId": "109",
        "solutionDate": "2026-06-16 11:32:04",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=15&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "davida",
      "name": "Davida",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 511,
      "description": "A dark C-type main-belt asteroid with a rotation of a little over five hours. Its neutral atlas globe indicates unavailable registered imagery.",
      "mapping": {
        "kind": "unmapped",
        "note": "No verified registered surface map is supplied. Neutral 3D shape and orientation are illustrative, with no geographic grid, coordinate probe or spatial pins.",
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=511&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "135.163 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (270.327 km). This size reference is not a local shape radius. Diameter-derived radius uncertainty ±0.5225 km (quoted source sigma).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=511&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "Not determined in this reference",
          "semantics": "reference",
          "context": "JPL’s selected physical-parameter record supplies no GM here. No zero gravity or density-based mass is invented.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=511&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "5.1297 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. No period uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=511&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=511&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "2053.518 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=511&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.076",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.007.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=511&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII C · Tholen C",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=511&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1903-May-30",
          "semantics": "historical",
          "context": "Catalog discovery attribution: Dugan, R. S., Heidelberg. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=511&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        }
      ],
      "points": [],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 3.161792846903028,
        "eccentricity": 0.1893732654213308,
        "inclinationDeg": 15.94980163416854,
        "ascendingNodeDeg": 107.5541377792688,
        "argumentPerihelionDeg": 336.5298509620977,
        "meanAnomalyDeg": 70.43603818535601,
        "meanMotionDegPerDay": 0.1753088960819653,
        "periodDays": 2053.518150223722,
        "solutionId": "128",
        "solutionDate": "2026-06-05 03:41:36",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=511&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "interamnia",
      "name": "Interamnia",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 704,
      "description": "A large, dark asteroid classified B in SMASSII and F in the Tholen scheme. These spectral labels describe observations, not a resolved surface map.",
      "mapping": {
        "kind": "unmapped",
        "note": "No verified registered surface map is supplied. Neutral 3D shape and orientation are illustrative, with no geographic grid, coordinate probe or spatial pins.",
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=704&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "153.156 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (306.313 km). This size reference is not a local shape radius. Diameter-derived radius uncertainty ±0.5155 km (quoted source sigma).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=704&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "0.21 m/s²",
          "semantics": "reference",
          "context": "Calculated as GM/r² from JPL GM=5. km³/s² and effective radius. Ignores irregular shape and centrifugal acceleration. The catalog supplies no GM uncertainty; this is a coarse reference. Selected catalog GM reference: Landgraf, IAU Symposium #152, 1992.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=704&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "8.727 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. No period uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=704&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=704&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1952.097 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=704&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.078",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.014.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=704&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII B · Tholen F",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=704&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1910-Oct-02",
          "semantics": "historical",
          "context": "Catalog discovery attribution: Cerulli, V., Teramo. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=704&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        }
      ],
      "points": [],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 3.056811711282865,
        "eccentricity": 0.1550586536072489,
        "inclinationDeg": 17.31528178196839,
        "ascendingNodeDeg": 280.1672242333686,
        "argumentPerihelionDeg": 94.06172596616008,
        "meanAnomalyDeg": 221.144848377515,
        "meanMotionDegPerDay": 0.1844170374508765,
        "periodDays": 1952.097295218148,
        "solutionId": "179",
        "solutionDate": "2026-06-05 03:56:56",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=704&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "lutetia",
      "name": "Lutetia",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 21,
      "description": "An irregular main-belt asteroid examined by Rosetta in 2010. Its flyby revealed heavily cratered terrain, but this atlas supplies no registered global texture.",
      "mapping": {
        "kind": "unmapped",
        "note": "No verified registered surface map is supplied. Neutral 3D shape and orientation are illustrative, with no geographic grid, coordinate probe or spatial pins.",
        "sourceUrls": [
          "https://pds.nasa.gov/ds-view/pds/viewProfile.jsp?dsid=RO-A-OSINAC%2FOSIWAC-5-LUTETIA-SHAPE-V1.0"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "49 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (98 km). This size reference is not a local shape radius. Diameter-derived radius uncertainty ±1 km (quoted source sigma).",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=21&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "0.0472 m/s²",
          "semantics": "reference",
          "context": "Calculated as GM/r² from JPL GM=0.1134 km³/s² and effective radius. Ignores irregular shape and centrifugal acceleration. Quoted GM sigma 0.0011 km³/s². Selected catalog GM reference: Patzold et al., Science 334, 491, 2011.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=21&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "8.1655 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. No period uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=21&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=21&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1387.377 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=21&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.19",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.01.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=21&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII Xk · Tholen M",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=21&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1852-Nov-15",
          "semantics": "historical",
          "context": "Catalog discovery attribution: Goldschmidt, H., Paris. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=21&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "exploration",
          "label": "Spacecraft exploration",
          "value": "Rosetta · 10 July 2010",
          "semantics": "historical",
          "context": "Historical flyby imagery and shape measurements, not a current spacecraft position.",
          "sourceUrls": [
            "https://pds.nasa.gov/ds-view/pds/viewProfile.jsp?dsid=RO-A-OSINAC%2FOSIWAC-5-LUTETIA-SHAPE-V1.0"
          ]
        }
      ],
      "points": [],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 2.434430742712361,
        "eccentricity": 0.1647703512177245,
        "inclinationDeg": 3.064452891064415,
        "ascendingNodeDeg": 80.83855721319993,
        "argumentPerihelionDeg": 249.8802780888828,
        "meanAnomalyDeg": 298.7726414605465,
        "meanMotionDegPerDay": 0.2594824191639628,
        "periodDays": 1387.377230256674,
        "solutionId": "146",
        "solutionDate": "2026-06-05 03:03:25",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=21&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      },
      "unlocatedFeatures": [
        {
          "id": "massilia",
          "name": "Massilia",
          "description": "A named impact crater on Lutetia, recorded by the IAU Gazetteer.",
          "whyInteresting": "A large named crater gives context to the flyby’s heavily cratered terrain. It has no map pin because this atlas supplies no registered Lutetia surface map.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14826",
            "https://pds.nasa.gov/ds-view/pds/viewProfile.jsp?dsid=RO-A-OSINAC%2FOSIWAC-5-LUTETIA-SHAPE-V1.0"
          ]
        },
        {
          "id": "baetica-regio",
          "name": "Baetica Regio",
          "description": "A named region honoring the Roman province corresponding to present-day Andalusia.",
          "whyInteresting": "The regional naming scheme reflects Lutetia’s Roman name. No geographic placement is implied by this unlocated card.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14842"
          ]
        },
        {
          "id": "narbonensis-regio",
          "name": "Narbonensis Regio",
          "description": "An IAU-named region referring to a Roman province in what is now southern France.",
          "whyInteresting": "It is a real named area in the flyby nomenclature, presented without invented map coordinates.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/14845"
          ]
        }
      ]
    },
    {
      "id": "ida",
      "name": "Ida",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 243,
      "description": "A cratered, elongated asteroid visited by Galileo in 1993. The encounter revealed its tiny companion Dactyl, the first moon discovered around an asteroid.",
      "mapping": {
        "kind": "surface",
        "note": "Historical spacecraft photomosaic with source coverage gaps retained. The spherical atlas is a geographic overview of a highly irregular body. Surface imagery is static; its illumination is not the current solar direction. Static Galileo simple-cylindrical photomosaic by P. Stooke and M. Nyrtsov, based on P. Thomas’s shape control. Detail varies sharply; coarse images, shadows and source processing remain visible. This spherical overview is not Ida’s irregular measured shape or a photometric data product. NASA/JPL; NASA PDS.",
        "sourceUrls": [
          "https://sbnarchive.psi.edu/pds3/multi_mission/MULTI_SA_MULTI_6_STOOKEMAPS_V3_0/document/00_map_guide.html#ida",
          "https://planetarynames.wr.usgs.gov/Page/IDA/target"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "16 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (32 km). This size reference is not a local shape radius. No diameter uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=243&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "0.0107 m/s²",
          "semantics": "reference",
          "context": "Calculated as GM/r² from JPL GM=0.00275 km³/s² and effective radius. Ignores irregular shape and centrifugal acceleration. Quoted GM sigma 0.00035 km³/s². Selected catalog GM reference: Belton et al. (1996) Icarus v.120, pp.185-199.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=243&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "4.634 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. No period uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=243&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=243&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1769.741 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=243&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.262",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.032.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=243&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII S · Tholen S",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=243&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1884-Sep-29",
          "semantics": "historical",
          "context": "Catalog discovery attribution: Palisa, J., Vienna. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=243&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "exploration",
          "label": "Spacecraft exploration",
          "value": "Galileo · 28 August 1993",
          "semantics": "historical",
          "context": "Historical flyby that revealed Dactyl, a small natural satellite.",
          "sourceUrls": [
            "https://science.nasa.gov/solar-system/asteroids/243-ida/"
          ]
        }
      ],
      "points": [
        {
          "id": "afon",
          "name": "Afon",
          "kind": "surface-feature",
          "latitude": -6.5,
          "longitude": 0,
          "description": "A small named crater that defines zero degrees longitude on Ida.",
          "whyInteresting": "It anchors the longitude reference used to compare Ida’s mapped terrain.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/75"
          ],
          "coordinateNotes": "Planetocentric latitude; east-positive longitude normalized to −180…180. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        },
        {
          "id": "lascaux",
          "name": "Lascaux",
          "kind": "surface-feature",
          "latitude": 0.8,
          "longitude": 161.2,
          "description": "An 11.8 km named impact crater near Ida’s equator.",
          "whyInteresting": "This prominent crater illustrates the scale of impact structures on a small irregular asteroid.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3284"
          ],
          "coordinateNotes": "Planetocentric latitude; east-positive longitude normalized to −180…180. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        },
        {
          "id": "palisa-regio",
          "name": "Palisa Regio",
          "kind": "surface-feature",
          "latitude": -23,
          "longitude": 34,
          "description": "A named region honoring Johann Palisa, the astronomer who discovered Ida.",
          "whyInteresting": "The regional name connects Galileo’s mapped terrain with the asteroid’s discovery history.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/4557"
          ],
          "coordinateNotes": "Planetocentric latitude; east-positive longitude normalized to −180…180. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        }
      ],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 2.863348031699649,
        "eccentricity": 0.04610962795708528,
        "inclinationDeg": 1.130363094271507,
        "ascendingNodeDeg": 323.5366609419851,
        "argumentPerihelionDeg": 113.2571826848795,
        "meanAnomalyDeg": 49.64769088009876,
        "meanMotionDegPerDay": 0.2034196328801896,
        "periodDays": 1769.740682857457,
        "solutionId": "191",
        "solutionDate": "2026-06-05 03:20:34",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=243&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "gaspra",
      "name": "Gaspra",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 951,
      "description": "Galileo’s 1991 encounter made Gaspra the first asteroid seen close up by a spacecraft. Its irregular surface is represented by a partial historical photomosaic.",
      "mapping": {
        "kind": "surface",
        "note": "Historical spacecraft photomosaic with source coverage gaps retained. The spherical atlas is a geographic overview of a highly irregular body. Surface imagery is static; its illumination is not the current solar direction. Static Galileo photomosaic by P. Stooke, controlled by P. Thomas. Uniform gray gaps and the far-southern cap are unobserved coverage; blurred regions can be genuine low-resolution images. Source shadows and processing remain. The spherical overview approximates Gaspra’s irregular shape and is not a terrain model. NASA/JPL; NASA PDS.",
        "sourceUrls": [
          "https://sbnarchive.psi.edu/pds3/multi_mission/MULTI_SA_MULTI_6_STOOKEMAPS_V3_0/document/00_map_guide.html#gaspra",
          "https://planetarynames.wr.usgs.gov/Page/GASPRA/target"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "6.1 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (12.2 km). This size reference is not a local shape radius. No diameter uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=951&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "Not determined in this reference",
          "semantics": "reference",
          "context": "JPL’s selected physical-parameter record supplies no GM here. No zero gravity or density-based mass is invented.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=951&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "7.042 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. No period uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=951&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=951&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1199.998 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=951&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.246",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.032.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=951&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII S · Tholen S",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=951&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1916-Jul-30",
          "semantics": "historical",
          "context": "Catalog discovery attribution: Neujmin, G., Simeis. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=951&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "exploration",
          "label": "Spacecraft exploration",
          "value": "Galileo · 29 October 1991",
          "semantics": "historical",
          "context": "The first close spacecraft asteroid encounter; the map is a historical partial mosaic.",
          "sourceUrls": [
            "https://nssdc.gsfc.nasa.gov/imgcat/html/object_page/gal_p40449.html"
          ]
        }
      ],
      "points": [
        {
          "id": "charax",
          "name": "Charax",
          "kind": "surface-feature",
          "latitude": 8.6,
          "longitude": 0,
          "description": "A small named crater defining zero degrees longitude on Gaspra.",
          "whyInteresting": "This landmark anchors the longitude reference for Gaspra’s historical spacecraft map.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/1147"
          ],
          "coordinateNotes": "Planetographic latitude; east-positive longitude normalized to −180…180. Published west-positive longitudes are converted. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        },
        {
          "id": "dunne-regio",
          "name": "Dunne Regio",
          "kind": "surface-feature",
          "latitude": 15,
          "longitude": -15,
          "description": "A named region honoring Galileo project planner James Dunne.",
          "whyInteresting": "Its regional center provides a geographic reference for the historical Galileo map.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/1665"
          ],
          "coordinateNotes": "Planetographic latitude; east-positive longitude normalized to −180…180. Published west-positive longitudes are converted. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        },
        {
          "id": "yeates-regio",
          "name": "Yeates Regio",
          "kind": "surface-feature",
          "latitude": 65,
          "longitude": -75,
          "description": "A northern region honoring Galileo project manager Clayne Yeates.",
          "whyInteresting": "It links the early asteroid encounter to the team that planned the Galileo mission.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/6647"
          ],
          "coordinateNotes": "Planetographic latitude; east-positive longitude normalized to −180…180. Published west-positive longitudes are converted. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        }
      ],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 2.209978353670737,
        "eccentricity": 0.1737374595425464,
        "inclinationDeg": 4.10465496946464,
        "ascendingNodeDeg": 252.9672913251979,
        "argumentPerihelionDeg": 130.0037637381037,
        "meanAnomalyDeg": 112.9508716440696,
        "meanMotionDegPerDay": 0.3000005452772328,
        "periodDays": 1199.997818895033,
        "solutionId": "162",
        "solutionDate": "2026-06-05 04:16:02",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=951&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    },
    {
      "id": "mathilde",
      "name": "Mathilde",
      "category": "asteroid",
      "parentId": "sun",
      "minorPlanetNumber": 253,
      "description": "A very slowly rotating, dark asteroid visited by NEAR in 1997. Large impact craters dominate the illuminated terrain recorded during the brief flyby.",
      "mapping": {
        "kind": "surface",
        "note": "Historical spacecraft photomosaic with source coverage gaps retained. The spherical atlas is a geographic overview of a highly irregular body. Known basin centers may lie in unobserved or shadowed source portions; a marker locates the basin from its mapped rims, not a photographed crater floor. Surface imagery is static; its illumination is not the current solar direction. Static NEAR flyby photomosaic by P. Stooke and J. Pfau, controlled by P. Thomas. Uniform gray areas are unknown; source shadows, seams and uneven detail remain. Known basin centers can lie in unobserved or shadowed areas, so a marker does not imply an imaged crater floor. The spherical overview does not show Mathilde’s measured irregular shape. NASA/APL; NASA PDS.",
        "sourceUrls": [
          "https://sbnarchive.psi.edu/pds3/multi_mission/MULTI_SA_MULTI_6_STOOKEMAPS_V3_0/document/00_map_guide.html#mathilde",
          "https://planetarynames.wr.usgs.gov/Page/MATHILDE/target"
        ]
      },
      "weather": {
        "mode": "no-atmosphere",
        "summary": "Airless surface: sunlight, impacts and space radiation affect the terrain. No live atmospheric weather, clouds, precipitation or wind layer is supplied.",
        "sourceUrls": [
          "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
        ]
      },
      "facts": [
        {
          "id": "radius",
          "label": "Effective radius",
          "value": "26.4 km",
          "semantics": "reference",
          "context": "Half of JPL’s selected effective diameter (52.8 km). This size reference is not a local shape radius. No diameter uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=253&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "gravity",
          "label": "Spherical gravity reference",
          "value": "0.0099 m/s²",
          "semantics": "reference",
          "context": "Calculated as GM/r² from JPL GM=0.00689 km³/s² and effective radius. Ignores irregular shape and centrifugal acceleration. Quoted GM sigma 0.00030 km³/s². Selected catalog GM reference: Yeomans et al. (1997) Science v.278, pp.2106-2109.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=253&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "rotation",
          "label": "Rotation period",
          "value": "417.7 h",
          "semantics": "reference",
          "context": "Catalog rotation-period reference, not a prediction of geographic spin phase. No period uncertainty is supplied in this snapshot.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=253&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "parent",
          "label": "Orbit center",
          "value": "Sun",
          "semantics": "reference",
          "context": "Heliocentric main-belt object; JPL class MBA and near-Earth flag false.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=253&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "orbit",
          "label": "Solar orbit",
          "value": "1572.914 Earth days",
          "semantics": "reference",
          "context": "Osculating period at JD 2461200.5 TDB. The approximate belt display propagates a fixed two-body orbit, not a precision observing ephemeris.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=253&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
            "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
          ]
        },
        {
          "id": "atmosphere",
          "label": "Atmosphere",
          "value": "No dense atmosphere",
          "semantics": "reference",
          "context": "Airless-surface reference for this asteroid. A thin or transient exosphere is not ruled out by the absence of a dense atmosphere.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "temperature",
          "label": "Thermal context",
          "value": "Surface heating varies",
          "semantics": "reference",
          "context": "Solar heating varies with illumination, local time and surface properties. No numerical global temperature or current thermal measurement is supplied in this atlas.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "pressure",
          "label": "Pressure reference",
          "value": "No numerical reference supplied",
          "semantics": "reference",
          "context": "No surface-pressure measurement is attached to this catalog entry. Unknown pressure is not represented as a measured zero.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "winds",
          "label": "Atmospheric winds",
          "value": "No atmospheric wind field",
          "semantics": "reference",
          "context": "No terrestrial-style atmospheric wind speed or direction is supplied. Solar-wind particles are a different phenomenon.",
          "sourceUrls": [
            "https://www.nasa.gov/missions/nasa-scientists-see-asteroid-through-the-eyes-of-a-robot/"
          ]
        },
        {
          "id": "albedo",
          "label": "Geometric albedo",
          "value": "0.0436",
          "semantics": "reference",
          "context": "JPL’s selected geometric albedo: reflected-light brightness relative to a reference disk, not a Bond albedo. Quoted sigma 0.004.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=253&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "spectral-type",
          "label": "Spectral classification",
          "value": "SMASSII Cb · Tholen not supplied",
          "semantics": "reference",
          "context": "Taxonomy describes measured reflectance spectra; it is not a unique chemical composition or proof of exposed metal.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=253&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "discovery",
          "label": "Discovery",
          "value": "1885-Nov-12",
          "semantics": "historical",
          "context": "Catalog discovery attribution: Palisa, J., Vienna. Historical discovery record.",
          "sourceUrls": [
            "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=253&phys-par=1&full-prec=1&cd-epoch=1&discovery=1"
          ]
        },
        {
          "id": "exploration",
          "label": "Spacecraft exploration",
          "value": "NEAR · 27 June 1997",
          "semantics": "historical",
          "context": "A brief historical flyby; the illuminated hemisphere supplies only partial geographic coverage.",
          "sourceUrls": [
            "https://science.nasa.gov/solar-system/asteroids/253-mathilde/"
          ]
        }
      ],
      "points": [
        {
          "id": "karoo",
          "name": "Karoo",
          "kind": "surface-feature",
          "latitude": 33.5,
          "longitude": -98.4,
          "description": "A large named crater on Mathilde, about 33.4 km across in the Gazetteer.",
          "whyInteresting": "Its diameter is a substantial fraction of Mathilde’s effective diameter.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/2931"
          ],
          "coordinateNotes": "Planetographic latitude; east-positive longitude normalized to −180…180. Published west-positive longitudes are converted. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        },
        {
          "id": "ishikari",
          "name": "Ishikari",
          "kind": "surface-feature",
          "latitude": -66.2,
          "longitude": 173.1,
          "description": "A southern impact crater about 29.3 km across in the Gazetteer.",
          "whyInteresting": "The coal-field naming theme reflects Mathilde’s dark appearance; it does not mean coal was detected.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/2730"
          ],
          "coordinateNotes": "Planetographic latitude; east-positive longitude normalized to −180…180. Published west-positive longitudes are converted. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        },
        {
          "id": "kuznetsk",
          "name": "Kuznetsk",
          "kind": "surface-feature",
          "latitude": -45.9,
          "longitude": -88.9,
          "description": "A southern named impact crater about 28.5 km across in the Gazetteer.",
          "whyInteresting": "Together with Karoo and Ishikari it shows how large impacts dominate the observed terrain.",
          "sourceUrls": [
            "https://planetarynames.wr.usgs.gov/Feature/3173"
          ],
          "coordinateNotes": "Planetographic latitude; east-positive longitude normalized to −180…180. Published west-positive longitudes are converted. Named feature-center overview reference; terrain and boundaries extend beyond the marker. Spherical atlas overview, not a surveyed 3D shape or a landing site."
        }
      ],
      "orbitalReference": {
        "epochJd": 2461200.5,
        "epochCalendar": "2026-Jun-09.0",
        "timeScale": "TDB",
        "referenceFrame": "heliocentric J2000 ecliptic",
        "semiMajorAxisAu": 2.646901224932316,
        "eccentricity": 0.2643478593847533,
        "inclinationDeg": 6.74046762132457,
        "ascendingNodeDeg": 179.4942079651114,
        "argumentPerihelionDeg": 157.5640226350525,
        "meanAnomalyDeg": 273.5338756003301,
        "meanMotionDegPerDay": 0.2288745331764189,
        "periodDays": 1572.914185793263,
        "solutionId": "250",
        "solutionDate": "2026-06-05 03:21:10",
        "orbitClass": "MBA",
        "neo": false,
        "sourceUrls": [
          "https://ssd-api.jpl.nasa.gov/sbdb.api?sstr=253&phys-par=1&full-prec=1&cd-epoch=1&discovery=1",
          "https://ssd-api.jpl.nasa.gov/doc/sbdb.html"
        ],
        "note": "Osculating reference snapshot; two-body propagation is approximate and excludes subsequent perturbations. Epoch is TDB; JPL solution date is Pacific local time. This is not a precision observing ephemeris."
      }
    }
  ]
}