List of natural satellites

The Solar System's planets and officially recognized dwarf planets are known to be orbited by 194 natural satellites, or moons. 19 moons in the Solar System are large enough to be gravitationally rounded, and thus would be considered planets or dwarf planets if they were in direct orbit around the Sun.

Moons are classed in two separate categories according to their orbits: regular moons, which have prograde orbits (they orbit in the direction of their planets' rotation) and lie close to the plane of their equators, and irregular moons, whose orbits can be pro- or retrograde (against the direction of their planets' rotation) and often lie at extreme angles to their planets' equators. Irregular moons are probably minor planets that have been captured from surrounding space. Most irregular moons are less than 10 kilometres (6.2 mi) in diameter.

The earliest published discovery of a moon other than the Earth's was by Galileo Galilei, who discovered the four Galilean moons orbiting Jupiter in 1610. Over the following three centuries only a few more moons were discovered. Missions to other planets in the 1970s, most notably the Voyager 1 and 2 missions, saw a surge in the number of moons detected, and observations since the year 2000, using mostly large, ground-based optical telescopes, have discovered many more, all of which are irregular. Recent years have had a drop in the number of discovered moons, with only 14 moons – twelve of Jupiter (ten of which were announced at the same time), one of Makemake, and one of Neptune – being discovered since 2012.

Moons by primary

Some moons, minor planets and comets of the Solar System to scale
Selected moons, with Earth to scale. Nineteen moons are large enough to be round, and one, Titan, has a substantial atmosphere.
The number of moons discovered in each year until the start of 2008.

Mercury, the smallest and innermost planet, has no moons, or at least none that can be detected to a diameter of 1.6 km (1.0 mi).[1] For a very short time in 1974, Mercury was thought to have a moon.

Venus also has no moons,[2] though reports of a moon around Venus have circulated since the 17th century.

Earth has one Moon, the largest moon of any rocky planet in the Solar System. Earth also has at least two co-orbitals: the asteroids 3753 Cruithne and 2002 AA29;[3] however, since they do not orbit Earth, they are not considered moons. (See Other moons of Earth and Quasi-satellite.)

Mars has two known moons, Phobos and Deimos ("fear" and "dread", after attendants of Ares, the Greek god of war, equivalent to the Roman Mars). Searches for more satellites have been unsuccessful, putting the maximum radius of any other satellites at 90 m (100 yd).[4]

Jupiter has 79 moons with known orbits, of which 72 have confirmed orbits and have thus received permanent designations; of these, 52 have been named. Its eight regular moons are grouped into the planet-sized Galilean moons and the far smaller Amalthea group. They are named after lovers of Zeus, the Greek equivalent of Jupiter. Its 71 known irregular moons are organized into two categories: prograde and retrograde. The prograde satellites consist of the Himalia group and three others in groups of one. The retrograde moons are grouped into the Carme, Ananke and Pasiphae groups.

Saturn has 62 moons with known orbits; 53 of them have names, and these are the ones with confirmed orbits. Most of them are quite small. Seven moons are large enough to be in hydrostatic equilibrium, including Titan, the second largest moon in the Solar System. Including these large moons, 24 of Saturn's moons are regular, and traditionally named after Titans or other figures associated with the mythological Saturn. The remaining 38, all small, are irregular, and classified by their orbital characteristics into Inuit, Norse, and Gallic groups, and their names are chosen from the corresponding mythologies. The rings of Saturn are made up of icy objects ranging in size from one centimetre to hundreds of metres, each of which is on its own orbit about the planet. Thus a precise number of Saturnian moons cannot be given, as there is no objective boundary between the countless small anonymous objects that form Saturn's ring system and the larger objects that have been named as moons. At least 150 "moonlets" embedded in the rings have been detected by the disturbance they create in the surrounding ring material, though this is thought to be only a small sample of the total population of such objects.

Uranus has 27 named moons, five of which are massive enough to have achieved hydrostatic equilibrium. There are another 13 inner moons that orbit within Uranus's ring system, and another nine outer irregular moons. Unlike most planetary moons, which are named from antiquity, all the moons of Uranus are named after characters from the works of Shakespeare and Alexander Pope's work The Rape of the Lock.

Neptune has 14 moons (one of which is unnamed); the largest, Triton, accounts for more than 99.5 percent of all the mass orbiting the planet. Triton is large enough to have achieved hydrostatic equilibrium, but, uniquely for a large moon, has a retrograde orbit, suggesting it was a dwarf planet that was captured. Neptune also has six known inner regular satellites, and six outer irregular satellites.

Pluto, a dwarf planet, has five moons. Its largest moon Charon, named after the ferryman who took souls across the River Styx, is more than half as large as Pluto itself, and large enough to orbit a point outside Pluto's surface. In effect, each orbits the other, forming a binary system informally referred to as a double-dwarf-planet. Pluto's four other moons, Nix, Hydra, Kerberos and Styx are far smaller and orbit the Pluto–Charon system.[5]

Among the other dwarf planets, Ceres has no known moons. It is 90 percent certain that Ceres has no moons larger than 1 km in size, assuming that they would have the same albedo as Ceres itself.[6] Haumea has two moons, Hi'iaka and Namaka, of radii ~195 and ~100 km, respectively.[7] Makemake has one moon, discovered in April 2016. A satellite having 1% Makemake's brightness would have been detected if it had been located at an angular distance from Makemake farther than 0.4 arcseconds (0.0001 degrees).[8] Eris has one known moon, Dysnomia. Accurately determining its size is difficult: one indicative estimate of its radius is 257±110 km,[9] but on some assumptions could be as high as 342±25 km.[10] The Kuiper belt object 90482 Orcus, believed to be a dwarf planet, was found in 2005[11] to have a natural satellite, later named Vanth. As of October 2009, 190 asteroid moons[12] and 63 trans-Neptunian moons had been discovered.[12]

Summary – number of moons
Planet Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
Number of moons 0 0 1 2 79 62 27 14
Dwarf planet Ceres Pluto Haumea Makemake Eris
Number of moons 0 5 2 1 1
Minor planet
See list

List

This is a list of the recognized moons of the planets and of the five recognised dwarf planets of the Solar System. The 19 moons that are large enough to have been rounded by their own gravity are listed in bold. The seven largest moons, which are larger than any of the known dwarf planets, are listed in bold and italic. Sidereal period differs from semi-major axis because it depends on the mass of the primary as well as the satellite's distance from it.

Satellite of Earth Satellites of Saturn Satellites of Pluto
Satellites of Mars Satellites of Uranus Satellites of Haumea
Satellites of Jupiter Satellites of Neptune Satellite of Makemake
Satellite of Eris
Image Numeral Name Mean radius (km) Semi-major axis (km) Sidereal period (d)
(r = retrograde)		 Discovery year Discovered by Notes Ref(s) Planet
IMoon1737.10 384,39927.321582Prehistoric—Synchronous rotation[13]Earth
IPhobos11.1 ± 0.15 9,3800.3191877Hall[14][15][16]Mars
IIDeimos6.2 ± 0.18 23,4601.2621877Hall[14][15][16]Mars
IIo1818.1 ± 0.1 421,8001.7691610GalileoMain-group moon (Galilean)[16][17]Jupiter
IIEuropa1560.7 ± 0.7 671,1003.5511610GalileoMain-group moon (Galilean)[16][17]Jupiter
IIIGanymede2634.1 ± 0.3 1,070,4007.1551610GalileoMain-group moon (Galilean)[16][17]Jupiter
IVCallisto2408.4 ± 0.3 1,882,70016.691610GalileoMain-group moon (Galilean)[16][17]Jupiter
VAmalthea83.45 ± 2.4 181,4000.4981892BarnardInner moon (Amalthea)[15][16][18]Jupiter
VIHimalia67 ± 10[19]11,461,000250.561904PerrinePrograde irregular (Himalia)[15][16][20]Jupiter
VIIElara43 11,741,000259.641905PerrinePrograde irregular (Himalia)[15][16][21]Jupiter
VIIIPasiphae30 23,624,000743.63 (r)1908MelotteRetrograde irregular (Pasiphae)[15][16][22]Jupiter
IXSinope19 23,939,000758.90 (r)1914NicholsonRetrograde irregular (Pasiphae)[15][16][23]Jupiter
XLysithea18 11,717,000259.201938NicholsonPrograde irregular (Himalia)[15][16][24]Jupiter
XICarme23 23,404,000734.17 (r)1938NicholsonRetrograde irregular (Carme)[15][16][24]Jupiter
XIIAnanke14 21,276,000629.77 (r)1951NicholsonRetrograde irregular (Ananke)[15][16][25]Jupiter
XIIILeda10 11,165,000240.921974KowalPrograde irregular (Himalia)[15][16][26]Jupiter
XIVThebe49.3 ± 2.0 221,9000.6751979Synnott (Voyager 1)Inner moon (Amalthea)[15][16][27]Jupiter
XVAdrastea8.2 ± 2.0 129,0000.2981979Jewitt, Danielson (Voyager 1)Inner moon (Amalthea)[15][16][28]Jupiter
XVIMetis21.5 ± 2.0 128,0000.2951979Synnott (Voyager 1)Inner moon (Amalthea)[15][16][29]Jupiter
XVIICallirrhoe4.3 24,103,000758.77 (r)2000Scotti, Spahr, McMillan, Larsen, Montani, Gleason, GehrelsRetrograde irregular (Pasiphae)[15][16][30]Jupiter
XVIIIThemisto4.0 7,284,000130.021975/2000Kowal and Roemer (original); Sheppard, Jewitt, Fernández, Magnier (rediscovery)Prograde irregular (Themisto)[15][16][31][32]Jupiter
XIXMegaclite2.7 23,493,000752.86 (r)2000Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Pasiphae)[15][16][33]Jupiter
XXTaygete2.5 23,280,000732.41 (r)2000Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Carme)[15][16][33]Jupiter
XXIChaldene1.9 23,100,000723.72 (r)2000Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Carme)[15][16][33]Jupiter
XXIIHarpalyke2.2 20,858,000623.32 (r)2000Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Ananke)[15][16][33]Jupiter
XXIIIKalyke2.6 23,483,000742.06 (r)2000Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Carme)[15][16][33]Jupiter
XXIVIocaste2.6 21,060,000631.60 (r)2000Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Ananke)[15][16][33]Jupiter
XXVErinome1.6 23,196,000728.46 (r)2000Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Carme)[15][16][33]Jupiter
XXVIIsonoe1.9 23,155,000726.23 (r)2000Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Carme)[15][16][33]Jupiter
XXVIIPraxidike3.4 20,908,000625.39 (r)2000Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Ananke)[15][16][33]Jupiter
XXVIIIAutonoe2.0 24,046,000760.95 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Pasiphae)[15][16][34]Jupiter
XXIXThyone2.0 20,939,000627.21 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Ananke)[15][16][34]Jupiter
XXXHermippe2.0 21,131,000633.9 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Ananke)[15][16][34]Jupiter
XXXIAitne1.5 23,229,000730.18 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Carme)[15][16][34]Jupiter
XXXIIEurydome1.5 22,865,000717.33 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Pasiphae)[15][16][34]Jupiter
XXXIIIEuanthe1.5 20,797,000620.49 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Ananke)[15][16][34]Jupiter
XXXIVEuporie1.0 19,304,000550.74 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Ananke)[15][16][34]Jupiter
XXXVOrthosie1.0 20,720,000622.56 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Ananke)[15][16][34]Jupiter
XXXVISponde1.0 23,487,000748.34 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Pasiphae)[15][16][34]Jupiter
XXXVIIKale1.0 23,217,000729.47 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Carme)[15][16][34]Jupiter
XXXVIIIPasithee1.0 23,004,000719.44 (r)2001Sheppard, Jewitt, KleynaRetrograde irregular (Carme)[15][16][34]Jupiter
XXXIXHegemone1.5 23,577,000739.88 (r)2003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Pasiphae)[15][16]Jupiter
XLMneme1.0 21,035,000620.04 (r)2003Gladman, AllenRetrograde irregular (Ananke)[15][16]Jupiter
XLIAoede2.0 23,980,000761.50 (r)2003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Pasiphae)[15][16]Jupiter
XLIIThelxinoe1.0 21,164,000628.09 (r)2003Sheppard, Jewitt, Kleyna, Gladman, Kavelaars, Petit, AllenRetrograde irregular (Ananke)[15][16]Jupiter
XLIIIArche1.5 23,355,000731.95 (r)2002Sheppard, Meech, Hsieh, Tholen, TonryRetrograde irregular (Carme)[15][16][34]Jupiter
XLIVKallichore1.0 23,288,000728.73 (r)2003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Carme)[15][16]Jupiter
XLVHelike2.0 21,069,000626.32 (r)2003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Ananke)[15][16]Jupiter
XLVICarpo1.5 17,058,000456.302003Sheppard, Gladman, Kavelaars, Petit, Allen, Jewitt, KleynaPrograde irregular (Carpo)[15][16]Jupiter
XLVIIEukelade2.0 23,328,000730.47 (r)2003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Carme)[15][16]Jupiter
XLVIIICyllene1.0 23,809,000752 (r)2003Sheppard, Jewitt, KleynaRetrograde irregular (Pasiphae)[15][16]Jupiter
XLIXKore1.0 24,543,000779.17 (r)2003Sheppard, Jewitt, KleynaRetrograde irregular (Pasiphae)[15][16]Jupiter
LHerse1.0 22,983,000714.51 (r)2003Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, AllenRetrograde irregular (Carme)[15][16]Jupiter
LIS/2010 J 11.0 23,314,335723.2 (r)2010Jacobson, Brozović, Gladman, AlexandersenRetrograde irregular (Carme)[35]Jupiter
LIIS/2010 J 20.5 20,307,150588.1 (r)2010VeilletRetrograde irregular (Ananke)[35]Jupiter
LIIIDia2.0 12,570,000287.932001Sheppard, Jewitt, Kleyna, Fernández, HsiehPrograde irregular (Himalia)[35]Jupiter
LIVS/2016 J 13.0 20,595,480602.7 (r)2016SheppardRetrograde irregular (Ananke)[35]Jupiter
LVS/2003 J 181.0 20,426,000596.58 (r)2003Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, AllenRetrograde irregular (Ananke)[15][16]Jupiter
LVIS/2011 J 20.5 23,329,710726.8 (r)2011SheppardRetrograde irregular (Pasiphae)[35]Jupiter
LVIIS/2003 J 52.0 23,498,000738.74 (r)2003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Carme)[15][16]Jupiter
LVIIIS/2003 J 151.0 22,630,000689.77 (r)2003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Pasiphae)[15][16]Jupiter
LIXS/2017 J 12.0 23,483,978734.2 (r)2017SheppardRetrograde irregular (Pasiphae)[35]Jupiter
LXS/2003 J 31.0 20,224,000583.88 (r)2003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Ananke)[15][16]Jupiter
LXIS/2003 J 191.0 23,535,000740.43 (r)2003Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, AllenRetrograde irregular (Carme)[15][16]Jupiter
LXIIValetudo0.5 18,928,095532.02016SheppardPrograde irregular (Valetudo)[35]Jupiter
LXIIIS/2017 J 21.0 23,240,957723.8 (r)2017SheppardRetrograde irregular (Carme)[35]Jupiter
LXIVS/2017 J 31.0 20,639,315605.8 (r)2017SheppardRetrograde irregular (Ananke)[35]Jupiter
LXVS/2017 J 41.0 11,494,801251.8 (r)2017SheppardPrograde irregular (Himalia)[35]Jupiter
LXVIS/2017 J 51.0 23,169,389720.5 (r)2017SheppardRetrograde irregular (Carme)[35]Jupiter
LXVIIS/2017 J 61.0 22,394,682684.7 (r)2017SheppardRetrograde irregular (Pasiphae)[35]Jupiter
LXVIIIS/2017 J 71.0 20,571,458602.8 (r)2017SheppardRetrograde irregular (Ananke)[35]Jupiter
LXIXS/2017 J 80.5 23,174,446720.7 (r)2017SheppardRetrograde irregular (Carme)[35]Jupiter
LXXS/2017 J 91.0 21,429,955640.9 (r)2017SheppardRetrograde irregular (Ananke)[35]Jupiter
LXXIS/2018 J 11.0 11,453,004250.4 (r)2018SheppardRetrograde irregular (Himalia)[35]Jupiter
LXXIIS/2011 J 10.5 20,155,290580.7 (r)2011SheppardRetrograde irregular (Carme)[35]Jupiter
—S/2003 J 21.0 28,455,000981.55 (r)2003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Pasiphae?)[15][16]Jupiter
—S/2003 J 41.0 23,933,000755.26 (r)2003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Pasiphae?)[15][16]Jupiter
—S/2003 J 90.5 23,388,000733.30 (r)2003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Carme)[15][16]Jupiter
—S/2003 J 101.0 23,044,000716.25 (r)2003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Carme?)[15][16]Jupiter
—S/2003 J 120.5 17,833,000489.72 (r)2003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Ananke?)[15][16]Jupiter
—S/2003 J 161.0 20,956,000616.33 (r)2003Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, AllenRetrograde irregular (Ananke)[15][16]Jupiter
—S/2003 J 231.0 23,566,000732.45 (r)2004Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Pasiphae?)[15][16]Jupiter
IMimas198.2 ± 0.4 185,5400.9421789HerschelMain-group moon[15][16]Saturn
IIEnceladus252.3 ± 0.6 238,0401.3701789HerschelMain-group moon[15][16]Saturn
IIITethys536.3 ± 1.5 294,6701.8881684CassiniMain-group moon (Sidera Lodoicea)[15][16]Saturn
IVDione562.5 ± 1.5 377,4202.7371684CassiniMain-group moon (Sidera Lodoicea)[15][16]Saturn
VRhea764.5 ± 2.0 527,0704.5181672CassiniMain-group moon (Sidera Lodoicea)[15][16]Saturn
VITitan2575.5 ± 2.0 1,221,87015.951655HuygensMain-group moon[15][16]Saturn
VIIHyperion133.0 ± 8.0 1,500,88021.281848W.Bond, G. Bond, and LassellMain-group moon[15][16]Saturn
VIIIIapetus734.5 ± 4.0 3,560,84079.331671CassiniMain-group moon (Sidera Lodoicea)[15][16]Saturn
IXPhoebe106.6 ± 1.1 12,947,780550.31 (r)1899PickeringRetrograde irregular (Norse)[15][16]Saturn
XJanus90.4 ± 3.0 151,4600.6951966Dollfus; Voyager 1 (confirmed)Inner moon (co-orbital)[15][16]Saturn
XIEpimetheus58.3 ± 3.1 151,4100.6941980Walker; Voyager 1 (confirmed)Inner moon (co-orbital)[15][16]Saturn
XIIHelene16 ± 4 377,4202.7371980Laques, LecacheuxMain-group trojan[15][16]Saturn
XIIITelesto12 ± 3 294,7101.8881980Smith, Reitsema, Larson, Fountain (Voyager 1)Main-group trojan[15][16]Saturn
XIVCalypso9.5 ± 1.5 294,7101.8881980Pascu, Seidelmann, Baum, CurrieMain-group trojan[15][16]Saturn
XVAtlas15.3 ± 1.2 137,6700.6021980Terrile (Voyager 1)Inner moon (shepherd)[15][16]Saturn
XVIPrometheus46.8 ± 5.6 139,3800.6131980Collins (Voyager 1)Inner moon (shepherd)[15][16]Saturn
XVIIPandora40.6 ± 4.5 141,7200.6291980Collins (Voyager 1)Inner moon (shepherd)[15][16]Saturn
XVIIIPan12.8 133,5800.5751990Showalter (Voyager 2)Inner moon (shepherd)[15][16]Saturn
XIXYmir9 23,140,4001,315.58 (r)2000GladmanRetrograde irregular (Norse)[15][16]Saturn
XXPaaliaq11 15,200,000686.952000GladmanPrograde irregular (Inuit)[15][16]Saturn
XXITarvos7.5 17,983,000926.232000Gladman, KavelaarsPrograde irregular (Gallic)[15][16]Saturn
XXIIIjiraq6 11,124,000451.422000Gladman, KavelaarsPrograde irregular (Inuit)[15][16]Saturn
XXIIISuttungr3.5 19,459,0001,016.67 (r)2000Gladman, KavelaarsRetrograde irregular (Norse)[15][16]Saturn
XXIVKiviuq8 11,110,000449.222000GladmanPrograde irregular (Inuit)[15][16]Saturn
XXVMundilfari3.5 18,628,000952.77 (r)2000Gladman, KavelaarsRetrograde irregular (Norse)[15][16]Saturn
XXVIAlbiorix16 16,182,000783.452000Holman, SpahrPrograde irregular (Gallic)[15][16]Saturn
XXVIISkathi4 15,540,000728.20 (r)2000Gladman, KavelaarsRetrograde irregular (Norse)[15][16]Saturn
XXVIIIErriapus5 17,343,000871.192000Gladman, KavelaarsPrograde irregular (Gallic)[15][16]Saturn
XXIXSiarnaq20 18,015,400896.442000Gladman, KavelaarsPrograde irregular (Inuit)[15][16]Saturn
XXXThrymr3.5 20,314,0001,094.11 (r)2000Gladman, KavelaarsRetrograde irregular (Norse)[15][16]Saturn
XXXINarvi3.5 19,007,0001,003.86 (r)2003Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[15][16]Saturn
XXXIIMethone1.6194,4401.0102004Porco, Charnoz, Brahic, Dones (Cassini–Huygens)Alkyonide moon[16]Saturn
XXXIIIPallene2 212,2801.1542004Gordon, Murray, Beurle, et al. (Cassini–Huygens)Alkyonide moon[16]Saturn
XXXIVPolydeuces1.25 377,2002.7372004Porco et al. (Cassini–Huygens)Main-group trojan[16]Saturn
XXXVDaphnis3–4 136,5000.5942005Porco et al. (Cassini–Huygens)Inner moon (shepherd)[16]Saturn
XXXVIAegir3 20,751,0001,117.52 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[15][16]Saturn
XXXVIIBebhionn3 17,119,000834.842004Sheppard, Jewitt, Kleyna, MarsdenPrograde irregular (Gallic)[15][16]Saturn
XXXVIIIBergelmir3 19,336,0001,005.74 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[15][16]Saturn
XXXIXBestla3.5 20,192,0001,088.72 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[15][16]Saturn
XLFarbauti2.5 20,377,0001,085.55 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[15][16]Saturn
XLIFenrir2 22,454,0001,260.35 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[15][16]Saturn
XLIIFornjot3 25,146,0001,494.2 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[15][16]Saturn
XLIIIHati3 19,846,0001,038.61 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[15][16]Saturn
XLIVHyrrokkin4 18,437,000931.86 (r)2006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[16]Saturn
XLVKari3.5 22,089,0001,230.97 (r)2006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[16]Saturn
XLVILoge3 23,058,0001,311.36 (r)2006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[16]Saturn
XLVIISkoll3 17,665,000878.29 (r)2006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[16]Saturn
XLVIIISurtur3 22,704,0001,297.36 (r)2006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[16]Saturn
XLIXAnthe1 197,7001.03652007Porco et al. (Cassini–Huygens)Alkyonide moon[36]Saturn
LJarnsaxa3 18,811,000964.74 (r)2006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[16]Saturn
LIGreip3 18,206,000921.19 (r)2006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[16]Saturn
LIITarqeq3.5 18,009,000887.482007Sheppard, Jewitt, KleynaPrograde irregular (Inuit)[16]Saturn
LIIIAegaeon0.25 167,5000.8082008Cassini Imaging Science Team Cassini–HuygensG-ring moonlet[37]Saturn
—S/2004 S 73 20,999,0001,140.24 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse?)[15][16]Saturn
—S/2004 S 122.5 19,878,0001,046.19 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse?)[15][16]Saturn
—S/2004 S 133 18,404,000933.48 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse?)[15][16]Saturn
—S/2004 S 172 19,447,0001,014.70 (r)2004Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse?)[15][16]Saturn
—S/2006 S 13 18,790,000963.37 (r)2006Sheppard, Jewitt, KleynaRetrograde irregular (Norse?)[16]Saturn
—S/2006 S 33 22,096,0001,227.21 (r)2006Sheppard, Jewitt, KleynaRetrograde irregular (Norse?)[16]Saturn
—S/2007 S 23 16,725,000808.08 (r)2007Sheppard, Jewitt, KleynaRetrograde irregular (Norse?)[16]Saturn
—S/2007 S 33 18,975,000977.8 (r)2007Sheppard, Jewitt, KleynaRetrograde irregular (Norse?)[16]Saturn
—S/2009 S 10.15 117,0000.4712009Cassini Imaging Science Team Cassini–HuygensB-ring moonlet[38]Saturn
IAriel578.9 ± 0.6 190,9002.5201851LassellMain-group moon[15][16]Uranus
IIUmbriel584.7 ± 2.8 266,0004.1441851LassellMain-group moon[15][16]Uranus
IIITitania788.9 ± 1.8 436,3008.7061787HerschelMain-group moon[15][16]Uranus
IVOberon761.4 ± 2.6 583,50013.461787HerschelMain-group moon[15][16]Uranus
VMiranda235.8 ± 0.7 129,9001.4131948KuiperMain-group moon[15][16]Uranus
VICordelia20.1 ± 3 49,8000.3351986Terrile (Voyager 2)Inner moon (shepherd)[15][16]Uranus
VIIOphelia21.4 ± 4 53,8000.3761986Terrile (Voyager 2)Inner moon (shepherd)[15][16]Uranus
VIIIBianca25.7 ± 2 59,2000.4351986Smith (Voyager 2)Inner moon[15][16]Uranus
IXCressida39.8 ± 2 61,8000.4641986Synnott (Voyager 2)Inner moon[15][16]Uranus
XDesdemona32.0 ± 4 62,7000.4741986Synnott (Voyager 2)Inner moon[15][16]Uranus
XIJuliet46.8 ± 4 64,4000.4931986Synnott (Voyager 2)Inner moon[15][16]Uranus
XIIPortia67.6 ± 4 66,1000.5131986Synnott (Voyager 2)Inner moon[15][16]Uranus
XIIIRosalind36 ± 6 69,9000.5581986Synnott (Voyager 2)Inner moon[15][16]Uranus
XIVBelinda40.3 ± 8 75,3000.6241986Synnott (Voyager 2)Inner moon[15][16]Uranus
XVPuck81 ± 2 86,0000.7621985Synnott (Voyager 2)Inner moon[15][16]Uranus
XVICaliban49 7,231,100579.73 (r)1997Gladman, Nicholson, Burns, KavelaarsRetrograde irregular[15][16]Uranus
XVIISycorax75 12,179,4001,288.38 (r)1997Gladman, Nicholson, Burns, KavelaarsRetrograde irregular[15][16]Uranus
XVIIIProspero25 16,256,0001,978.29 (r)1999Gladman, Holman, Kavelaars, Petit, SchollRetrograde irregular[15][16]Uranus
XIXSetebos24 17,418,0002,225.21 (r)1999Gladman, Holman, Kavelaars, Petit, SchollRetrograde irregular[15][16]Uranus
XXStephano10 8,004,000677.36 (r)1999Gladman, Holman, Kavelaars, Petit, SchollRetrograde irregular[15][16]Uranus
XXITrinculo5 8,504,000749.24 (r)2001Holman, Kavelaars, MilisavljevicRetrograde irregular[15][16]Uranus
XXIIFrancisco6 4,276,000266.56 (r)2001Holman, Kavelaars, Milisavljevic, GladmanRetrograde irregular[15][16]Uranus
XXIIIMargaret5.5 14,345,0001,687.012003Sheppard, JewittPrograde irregular[15][16]Uranus
XXIVFerdinand6 20,901,0002,887.21 (r)2001Holman, Kavelaars, Milisavljevic, et al.Retrograde irregular[15][16]Uranus
XXVPerdita10 76,4170.6381986Karkoschka (Voyager 2)Inner moon[16]Uranus
XXVIMab5 97,7360.9232003Showalter, LissauerInner moon[16]Uranus
XXVIICupid5 74,3920.6132003Showalter, LissauerInner moon[16]Uranus
ITriton1353.4 ± 0.9 354,8005.877 (r)1846LassellRetrograde irregular[15][16]Neptune
IINereid170 ± 25 5,513,820360.141949KuiperPrograde irregular[15][16]Neptune
IIINaiad33 ± 3 48,2270.2941989Terrile (Voyager 2)Inner moon[15][16]Neptune
IVThalassa41 ± 3 50,0750.3111989Terrile (Voyager 2)Inner moon[15][16]Neptune
VDespina75 ± 3 52,5260.3351989Synnott (Voyager 2)Inner moon[15][16]Neptune
VIGalatea88 ± 4 61,9530.4291989Synnott (Voyager 2)Inner moon[15][16]Neptune
VIILarissa97 ± 3 73,5480.5551982Reitsema, Hubbard, Lebofsky, Tholen (Voyager 2)Inner moon[15][16]Neptune
VIIIProteus210 ± 7 117,6471.1221989Synnott (Voyager 2)Inner moon[15][16]Neptune
IXHalimede31 15,728,0001,879.71 (r)2002Holman, Kavelaars, Grav, Fraser, MilisavljevicRetrograde irregular[15][16]Neptune
XPsamathe20 46,695,0009,115.91 (r)2003Jewitt, Kleyna, Sheppard, Holman, KavelaarsRetrograde irregular[15][16]Neptune
XISao22 22,422,0002,914.072002Holman, Kavelaars, Grav, Fraser, MilisavljevicPrograde irregular[15][16]Neptune
XIILaomedeia21 23,571,0003,167.852002Holman, Kavelaars, Grav, Fraser, MilisavljevicPrograde irregular[15][16]Neptune
XIIINeso30 48,387,0009,373.99 (r)2002Holman, Kavelaars, Grav, Fraser, MilisavljevicRetrograde irregular[15][16]Neptune
XIVS/2004 N 18–10105,2830.93622013Showalter et al.Inner moon[39]Neptune
ICharon603.6 ± 1.4 19,5916.3871978Christy[15][16]Pluto
IINix23.0 ± 2 48,67124.852005Weaver, Stern, Buie, et al.[15][16]Pluto
IIIHydra30.5 ± 4 64,69838.202005Weaver, Stern, Buie, et al.[15][16]Pluto
IVKerberos14.0 57,72932.172011Showalter (Hubble)[15][16][40][41]Pluto
VStyx10.042,39320.162012Showalter (Hubble)[15][16][42]Pluto
IHiʻiaka~160 49,500 ± 40049.12 ± 0.032005Brown et al.[7][43]Haumea
IINamaka~8539,000 (r)34.7 ± 0.1
if e = 0		2005Brown et al.[7][43]Haumea
—S/2015 (136472) 1~80 2016Parker et al.[44]Makemake
IDysnomia257± 110[9]37,370 ± 15015.774 ± 0.0022005Brown, Rabinowitz, Trujillo et al.SDO moon[45][46][47]Eris

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