{
  "asOf": "September 2026",
  "source": "NASA Science and JPL Solar System Dynamics (ssd.jpl.nasa.gov/sats)",
  "note": "counts are all confirmed moons known as of the date above; the moons array lists named and notable moons only, with real values rounded. distanceKm is the mean orbital distance from the parent; periodDays is the orbital period; diameterKm is the mean diameter. image is the sprite slug in src/assets/img when artwork exists.",
  "counts": {
    "Mercury": 0,
    "Venus": 0,
    "Earth": 1,
    "Mars": 2,
    "Jupiter": 115,
    "Saturn": 293,
    "Uranus": 29,
    "Neptune": 16,
    "Ceres": 0,
    "Pluto": 5,
    "Haumea": 2,
    "Makemake": 1,
    "Eris": 1
  },
  "moons": [
    {
      "name": "Luna",
      "displayName": "The Moon",
      "parent": "Earth",
      "distanceKm": 384400,
      "periodDays": 27.32,
      "diameterKm": 3474,
      "discovered": "known since prehistory",
      "image": "moon"
    },
    {
      "name": "Phobos",
      "parent": "Mars",
      "distanceKm": 9376,
      "periodDays": 0.319,
      "diameterKm": 22,
      "discovered": "1877, Asaph Hall",
      "image": "phobos"
    },
    {
      "name": "Deimos",
      "parent": "Mars",
      "distanceKm": 23463,
      "periodDays": 1.263,
      "diameterKm": 12,
      "discovered": "1877, Asaph Hall",
      "image": "deimos"
    },
    {
      "name": "Io",
      "parent": "Jupiter",
      "distanceKm": 421700,
      "periodDays": 1.769,
      "diameterKm": 3643,
      "discovered": "1610, Galileo",
      "image": "io"
    },
    {
      "name": "Europa",
      "parent": "Jupiter",
      "distanceKm": 671034,
      "periodDays": 3.551,
      "diameterKm": 3122,
      "discovered": "1610, Galileo",
      "image": "europa"
    },
    {
      "name": "Ganymede",
      "parent": "Jupiter",
      "distanceKm": 1070412,
      "periodDays": 7.155,
      "diameterKm": 5268,
      "discovered": "1610, Galileo",
      "image": "ganymede"
    },
    {
      "name": "Callisto",
      "parent": "Jupiter",
      "distanceKm": 1882709,
      "periodDays": 16.69,
      "diameterKm": 4821,
      "discovered": "1610, Galileo",
      "image": "callisto"
    },
    {
      "name": "Amalthea",
      "parent": "Jupiter",
      "distanceKm": 181366,
      "periodDays": 0.498,
      "diameterKm": 167,
      "discovered": "1892, Edward Barnard",
      "image": "amalthea"
    },
    {
      "name": "Himalia",
      "parent": "Jupiter",
      "distanceKm": 11460000,
      "periodDays": 250.6,
      "diameterKm": 140,
      "discovered": "1904, Charles Perrine",
      "image": "himalia"
    },
    {
      "name": "Thebe",
      "parent": "Jupiter",
      "distanceKm": 221900,
      "periodDays": 0.675,
      "diameterKm": 99,
      "discovered": "1979, Voyager 1",
      "image": "thebe"
    },
    {
      "name": "Elara",
      "parent": "Jupiter",
      "distanceKm": 11740000,
      "periodDays": 259.6,
      "diameterKm": 80,
      "discovered": "1905, Charles Perrine",
      "image": "tiny-moon-7"
    },
    {
      "name": "Pasiphae",
      "parent": "Jupiter",
      "distanceKm": 23620000,
      "periodDays": 743.6,
      "diameterKm": 58,
      "discovered": "1908, Philibert Melotte",
      "image": "tiny-moon-0"
    },
    {
      "name": "Carme",
      "parent": "Jupiter",
      "distanceKm": 23400000,
      "periodDays": 734,
      "diameterKm": 46,
      "discovered": "1938, Seth Nicholson",
      "image": "tiny-moon-3"
    },
    {
      "name": "Metis",
      "parent": "Jupiter",
      "distanceKm": 128000,
      "periodDays": 0.295,
      "diameterKm": 43,
      "discovered": "1979, Voyager 1",
      "image": "metis"
    },
    {
      "name": "Sinope",
      "parent": "Jupiter",
      "distanceKm": 23940000,
      "periodDays": 758.9,
      "diameterKm": 38,
      "discovered": "1914, Seth Nicholson",
      "image": "tiny-moon-1"
    },
    {
      "name": "Lysithea",
      "parent": "Jupiter",
      "distanceKm": 11720000,
      "periodDays": 259.2,
      "diameterKm": 36,
      "discovered": "1938, Seth Nicholson",
      "image": "tiny-moon-6"
    },
    {
      "name": "Ananke",
      "parent": "Jupiter",
      "distanceKm": 21280000,
      "periodDays": 629.8,
      "diameterKm": 28,
      "discovered": "1951, Seth Nicholson",
      "image": "tiny-moon-1"
    },
    {
      "name": "Leda",
      "parent": "Jupiter",
      "distanceKm": 11165000,
      "periodDays": 240.9,
      "diameterKm": 20,
      "discovered": "1974, Charles Kowal",
      "image": "tiny-moon-5"
    },
    {
      "name": "Adrastea",
      "parent": "Jupiter",
      "distanceKm": 129000,
      "periodDays": 0.298,
      "diameterKm": 16,
      "discovered": "1979, Voyager 2",
      "image": "adrastea"
    },
    {
      "name": "Titan",
      "parent": "Saturn",
      "distanceKm": 1221870,
      "periodDays": 15.95,
      "diameterKm": 5150,
      "discovered": "1655, Christiaan Huygens",
      "image": "titan"
    },
    {
      "name": "Rhea",
      "parent": "Saturn",
      "distanceKm": 527108,
      "periodDays": 4.518,
      "diameterKm": 1527,
      "discovered": "1672, Giovanni Cassini",
      "image": "rhea"
    },
    {
      "name": "Iapetus",
      "parent": "Saturn",
      "distanceKm": 3560820,
      "periodDays": 79.32,
      "diameterKm": 1469,
      "discovered": "1671, Giovanni Cassini",
      "image": "iapetus"
    },
    {
      "name": "Dione",
      "parent": "Saturn",
      "distanceKm": 377396,
      "periodDays": 2.737,
      "diameterKm": 1123,
      "discovered": "1684, Giovanni Cassini",
      "image": "dione"
    },
    {
      "name": "Tethys",
      "parent": "Saturn",
      "distanceKm": 294619,
      "periodDays": 1.888,
      "diameterKm": 1062,
      "discovered": "1684, Giovanni Cassini",
      "image": "tethys"
    },
    {
      "name": "Enceladus",
      "parent": "Saturn",
      "distanceKm": 237948,
      "periodDays": 1.37,
      "diameterKm": 504,
      "discovered": "1789, William Herschel",
      "image": "enceladus"
    },
    {
      "name": "Mimas",
      "parent": "Saturn",
      "distanceKm": 185539,
      "periodDays": 0.942,
      "diameterKm": 396,
      "discovered": "1789, William Herschel",
      "image": "mimas"
    },
    {
      "name": "Hyperion",
      "parent": "Saturn",
      "distanceKm": 1481010,
      "periodDays": 21.28,
      "diameterKm": 270,
      "discovered": "1848, William Bond, George Bond and William Lassell",
      "image": "hyperion"
    },
    {
      "name": "Phoebe",
      "parent": "Saturn",
      "distanceKm": 12947780,
      "periodDays": 550.5,
      "diameterKm": 213,
      "discovered": "1899, William Pickering",
      "image": "phoebe"
    },
    {
      "name": "Janus",
      "parent": "Saturn",
      "distanceKm": 151460,
      "periodDays": 0.695,
      "diameterKm": 179,
      "discovered": "1966, Audouin Dollfus",
      "image": "tiny-moon-4"
    },
    {
      "name": "Epimetheus",
      "parent": "Saturn",
      "distanceKm": 151410,
      "periodDays": 0.694,
      "diameterKm": 116,
      "discovered": "1966, confirmed 1980",
      "image": "tiny-moon-0"
    },
    {
      "name": "Prometheus",
      "parent": "Saturn",
      "distanceKm": 139380,
      "periodDays": 0.613,
      "diameterKm": 86,
      "discovered": "1980, Voyager 1",
      "image": "tiny-moon-1"
    },
    {
      "name": "Pandora",
      "parent": "Saturn",
      "distanceKm": 141720,
      "periodDays": 0.629,
      "diameterKm": 81,
      "discovered": "1980, Voyager 1",
      "image": "tiny-moon-3"
    },
    {
      "name": "Helene",
      "parent": "Saturn",
      "distanceKm": 377400,
      "periodDays": 2.737,
      "diameterKm": 35,
      "discovered": "1980, Pierre Laques and Jean Lecacheux",
      "image": "tiny-moon-7"
    },
    {
      "name": "Atlas",
      "parent": "Saturn",
      "distanceKm": 137670,
      "periodDays": 0.602,
      "diameterKm": 30,
      "discovered": "1980, Voyager 1",
      "image": "tiny-moon-7"
    },
    {
      "name": "Pan",
      "parent": "Saturn",
      "distanceKm": 133584,
      "periodDays": 0.575,
      "diameterKm": 28,
      "discovered": "1990, in Voyager 2 images",
      "image": "pan"
    },
    {
      "name": "Telesto",
      "parent": "Saturn",
      "distanceKm": 294720,
      "periodDays": 1.888,
      "diameterKm": 25,
      "discovered": "1980",
      "image": "tiny-moon-1"
    },
    {
      "name": "Paaliaq",
      "parent": "Saturn",
      "distanceKm": 15200000,
      "periodDays": 687,
      "diameterKm": 22,
      "discovered": "2000, Brett Gladman and team",
      "image": "tiny-moon-7"
    },
    {
      "name": "Calypso",
      "parent": "Saturn",
      "distanceKm": 294720,
      "periodDays": 1.888,
      "diameterKm": 21,
      "discovered": "1980",
      "image": "tiny-moon-5"
    },
    {
      "name": "Ymir",
      "parent": "Saturn",
      "distanceKm": 23040000,
      "periodDays": 1315,
      "diameterKm": 18,
      "discovered": "2000, Brett Gladman and team",
      "image": "tiny-moon-3"
    },
    {
      "name": "Titania",
      "parent": "Uranus",
      "distanceKm": 435910,
      "periodDays": 8.706,
      "diameterKm": 1577,
      "discovered": "1787, William Herschel",
      "image": "titania"
    },
    {
      "name": "Oberon",
      "parent": "Uranus",
      "distanceKm": 583520,
      "periodDays": 13.46,
      "diameterKm": 1523,
      "discovered": "1787, William Herschel",
      "image": "oberon"
    },
    {
      "name": "Umbriel",
      "parent": "Uranus",
      "distanceKm": 266000,
      "periodDays": 4.144,
      "diameterKm": 1169,
      "discovered": "1851, William Lassell",
      "image": "umbriel"
    },
    {
      "name": "Ariel",
      "parent": "Uranus",
      "distanceKm": 191020,
      "periodDays": 2.52,
      "diameterKm": 1158,
      "discovered": "1851, William Lassell",
      "image": "ariel"
    },
    {
      "name": "Miranda",
      "parent": "Uranus",
      "distanceKm": 129390,
      "periodDays": 1.413,
      "diameterKm": 472,
      "discovered": "1948, Gerard Kuiper",
      "image": "miranda"
    },
    {
      "name": "Puck",
      "parent": "Uranus",
      "distanceKm": 86010,
      "periodDays": 0.762,
      "diameterKm": 162,
      "discovered": "1985, Voyager 2",
      "image": "tiny-moon-6"
    },
    {
      "name": "Sycorax",
      "parent": "Uranus",
      "distanceKm": 12179000,
      "periodDays": 1288,
      "diameterKm": 150,
      "discovered": "1997, Brett Gladman and team",
      "image": "tiny-moon-3"
    },
    {
      "name": "Portia",
      "parent": "Uranus",
      "distanceKm": 66097,
      "periodDays": 0.513,
      "diameterKm": 135,
      "discovered": "1986, Voyager 2",
      "image": "tiny-moon-2"
    },
    {
      "name": "Juliet",
      "parent": "Uranus",
      "distanceKm": 64358,
      "periodDays": 0.493,
      "diameterKm": 94,
      "discovered": "1986, Voyager 2",
      "image": "tiny-moon-0"
    },
    {
      "name": "Belinda",
      "parent": "Uranus",
      "distanceKm": 75256,
      "periodDays": 0.624,
      "diameterKm": 90,
      "discovered": "1986, Voyager 2",
      "image": "tiny-moon-4"
    },
    {
      "name": "Cressida",
      "parent": "Uranus",
      "distanceKm": 61777,
      "periodDays": 0.464,
      "diameterKm": 80,
      "discovered": "1986, Voyager 2",
      "image": "tiny-moon-7"
    },
    {
      "name": "Rosalind",
      "parent": "Uranus",
      "distanceKm": 69927,
      "periodDays": 0.558,
      "diameterKm": 72,
      "discovered": "1986, Voyager 2",
      "image": "tiny-moon-2"
    },
    {
      "name": "Caliban",
      "parent": "Uranus",
      "distanceKm": 7231000,
      "periodDays": 580,
      "diameterKm": 72,
      "discovered": "1997, Brett Gladman and team",
      "image": "tiny-moon-5"
    },
    {
      "name": "Desdemona",
      "parent": "Uranus",
      "distanceKm": 62658,
      "periodDays": 0.474,
      "diameterKm": 64,
      "discovered": "1986, Voyager 2",
      "image": "tiny-moon-0"
    },
    {
      "name": "Bianca",
      "parent": "Uranus",
      "distanceKm": 59166,
      "periodDays": 0.435,
      "diameterKm": 51,
      "discovered": "1986, Voyager 2",
      "image": "tiny-moon-1"
    },
    {
      "name": "Prospero",
      "parent": "Uranus",
      "distanceKm": 16256000,
      "periodDays": 1978,
      "diameterKm": 50,
      "discovered": "1999, Matthew Holman and team",
      "image": "tiny-moon-2"
    },
    {
      "name": "Setebos",
      "parent": "Uranus",
      "distanceKm": 17418000,
      "periodDays": 2225,
      "diameterKm": 48,
      "discovered": "1999, John Kavelaars and team",
      "image": "tiny-moon-6"
    },
    {
      "name": "Ophelia",
      "parent": "Uranus",
      "distanceKm": 53764,
      "periodDays": 0.376,
      "diameterKm": 43,
      "discovered": "1986, Voyager 2",
      "image": "tiny-moon-5"
    },
    {
      "name": "Cordelia",
      "parent": "Uranus",
      "distanceKm": 49770,
      "periodDays": 0.335,
      "diameterKm": 40,
      "discovered": "1986, Voyager 2",
      "image": "tiny-moon-0"
    },
    {
      "name": "Stephano",
      "parent": "Uranus",
      "distanceKm": 8004000,
      "periodDays": 677,
      "diameterKm": 32,
      "discovered": "1999, Brett Gladman and team",
      "image": "tiny-moon-3"
    },
    {
      "name": "Triton",
      "parent": "Neptune",
      "distanceKm": 354759,
      "periodDays": 5.877,
      "diameterKm": 2707,
      "discovered": "1846, William Lassell",
      "image": "triton"
    },
    {
      "name": "Proteus",
      "parent": "Neptune",
      "distanceKm": 117647,
      "periodDays": 1.122,
      "diameterKm": 420,
      "discovered": "1989, Voyager 2",
      "image": "proteus"
    },
    {
      "name": "Nereid",
      "parent": "Neptune",
      "distanceKm": 5513818,
      "periodDays": 360.1,
      "diameterKm": 357,
      "discovered": "1949, Gerard Kuiper",
      "image": "nereid"
    },
    {
      "name": "Larissa",
      "parent": "Neptune",
      "distanceKm": 73548,
      "periodDays": 0.555,
      "diameterKm": 194,
      "discovered": "1981 from Earth, confirmed by Voyager 2 in 1989",
      "image": "tiny-moon-0"
    },
    {
      "name": "Galatea",
      "parent": "Neptune",
      "distanceKm": 61953,
      "periodDays": 0.429,
      "diameterKm": 176,
      "discovered": "1989, Voyager 2",
      "image": "tiny-moon-3"
    },
    {
      "name": "Despina",
      "parent": "Neptune",
      "distanceKm": 52526,
      "periodDays": 0.335,
      "diameterKm": 150,
      "discovered": "1989, Voyager 2",
      "image": "tiny-moon-3"
    },
    {
      "name": "Thalassa",
      "parent": "Neptune",
      "distanceKm": 50075,
      "periodDays": 0.311,
      "diameterKm": 82,
      "discovered": "1989, Voyager 2",
      "image": "tiny-moon-2"
    },
    {
      "name": "Halimede",
      "parent": "Neptune",
      "distanceKm": 16611000,
      "periodDays": 1879,
      "diameterKm": 62,
      "discovered": "2002, Matthew Holman and team",
      "image": "tiny-moon-3"
    },
    {
      "name": "Neso",
      "parent": "Neptune",
      "distanceKm": 49285000,
      "periodDays": 9374,
      "diameterKm": 60,
      "discovered": "2002, Matthew Holman and team",
      "image": "tiny-moon-5"
    },
    {
      "name": "Naiad",
      "parent": "Neptune",
      "distanceKm": 48227,
      "periodDays": 0.294,
      "diameterKm": 60,
      "discovered": "1989, Voyager 2",
      "image": "tiny-moon-0"
    },
    {
      "name": "Sao",
      "parent": "Neptune",
      "distanceKm": 22228000,
      "periodDays": 2914,
      "diameterKm": 44,
      "discovered": "2002, Matthew Holman and team",
      "image": "tiny-moon-1"
    },
    {
      "name": "Laomedeia",
      "parent": "Neptune",
      "distanceKm": 23567000,
      "periodDays": 3168,
      "diameterKm": 42,
      "discovered": "2002, Matthew Holman and team",
      "image": "tiny-moon-7"
    },
    {
      "name": "Psamathe",
      "parent": "Neptune",
      "distanceKm": 46695000,
      "periodDays": 9115,
      "diameterKm": 40,
      "discovered": "2003, Scott Sheppard and team",
      "image": "tiny-moon-5"
    },
    {
      "name": "Hippocamp",
      "parent": "Neptune",
      "distanceKm": 105283,
      "periodDays": 0.95,
      "diameterKm": 35,
      "discovered": "2013, Mark Showalter, in Hubble images",
      "image": "tiny-moon-3"
    },
    {
      "name": "Charon",
      "parent": "Pluto",
      "distanceKm": 19591,
      "periodDays": 6.387,
      "diameterKm": 1212,
      "discovered": "1978, James Christy",
      "image": "charon"
    },
    {
      "name": "Hydra",
      "parent": "Pluto",
      "distanceKm": 64738,
      "periodDays": 38.2,
      "diameterKm": 51,
      "discovered": "2005, Hubble",
      "image": "hydra"
    },
    {
      "name": "Nix",
      "parent": "Pluto",
      "distanceKm": 48694,
      "periodDays": 24.85,
      "diameterKm": 50,
      "discovered": "2005, Hubble",
      "image": "nix"
    },
    {
      "name": "Kerberos",
      "parent": "Pluto",
      "distanceKm": 57783,
      "periodDays": 32.17,
      "diameterKm": 19,
      "discovered": "2011, Hubble",
      "image": "kerberos"
    },
    {
      "name": "Styx",
      "parent": "Pluto",
      "distanceKm": 42656,
      "periodDays": 20.16,
      "diameterKm": 16,
      "discovered": "2012, Hubble",
      "image": "styx"
    },
    {
      "name": "Hi'iaka",
      "parent": "Haumea",
      "distanceKm": 49880,
      "periodDays": 49.12,
      "diameterKm": 310,
      "discovered": "2005, Keck Observatory",
      "image": "hi-iaka"
    },
    {
      "name": "Namaka",
      "parent": "Haumea",
      "distanceKm": 25657,
      "periodDays": 18.28,
      "diameterKm": 170,
      "discovered": "2005, Keck Observatory",
      "image": "namaka"
    },
    {
      "name": "MK2",
      "displayName": "MK2 (S/2015 (136472) 1)",
      "parent": "Makemake",
      "distanceKm": 21000,
      "periodDays": 12.4,
      "diameterKm": 175,
      "discovered": "2015 Hubble images, announced 2016; not yet formally named",
      "image": "mk2"
    },
    {
      "name": "Dysnomia",
      "parent": "Eris",
      "distanceKm": 37273,
      "periodDays": 15.79,
      "diameterKm": 615,
      "discovered": "2005, Keck Observatory",
      "image": "dysnomia"
    },
    {
      "name": "Callirrhoe",
      "parent": "Jupiter",
      "distanceKm": 23789400,
      "periodDays": -749.79,
      "diameterKm": 9.6,
      "discovered": "1999, Jim Scotti and team",
      "image": "tiny-moon-0"
    },
    {
      "name": "Themisto",
      "parent": "Jupiter",
      "distanceKm": 7397000,
      "periodDays": 129.97,
      "diameterKm": 9,
      "discovered": "1975, Charles Kowal and Elizabeth Roemer",
      "image": "tiny-moon-4"
    },
    {
      "name": "Megaclite",
      "parent": "Jupiter",
      "distanceKm": 23640100,
      "periodDays": -742.77,
      "diameterKm": 6,
      "discovered": "2000, Scott Sheppard and team",
      "image": "tiny-moon-0"
    },
    {
      "name": "Taygete",
      "parent": "Jupiter",
      "distanceKm": 23103400,
      "periodDays": -717.59,
      "diameterKm": 5,
      "discovered": "2000, Scott Sheppard and team",
      "image": "tiny-moon-6"
    },
    {
      "name": "Chaldene",
      "parent": "Jupiter",
      "distanceKm": 22926300,
      "periodDays": -709.36,
      "diameterKm": 4,
      "discovered": "2000, Scott Sheppard and team",
      "image": "tiny-moon-2"
    },
    {
      "name": "Harpalyke",
      "parent": "Jupiter",
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    {
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    {
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    {
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      "discovered": "2001, Dan Milisavljevic, Matthew Holman, John Kavelaars and Tommy Grav",
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    {
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      "discovered": "1999, Erich Karkoschka (identified in 1986 Voyager 2 images)",
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      "diameterKm": 18,
      "discovered": "2003, Mark Showalter and Jack Lissauer",
      "image": "tiny-moon-5"
    },
    {
      "name": "Cupid",
      "parent": "Uranus",
      "distanceKm": 74396,
      "periodDays": 0.6125,
      "diameterKm": 18,
      "discovered": "2003, Mark Showalter and Jack Lissauer",
      "image": "tiny-moon-0"
    }
  ]
}