The Solar System's eight planets, and its nine most likely dwarf planets, are known to be orbited by at least 297 natural satellites, or moons. At least 19 of them are large enough to be gravitationally rounded; of these, all are covered by a crust of ice except for Earth's Moon and Jupiter's Io.[1] Several of the largest ones are in hydrostatic equilibrium and would therefore be considered dwarf planets or planets if they were in direct orbit around the Sun and not in their current states (orbiting planets or dwarf planets).

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 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.

Moons by primary

Some moons, minor planets and comets of the Solar System to scale (major planets not 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 November 2019

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).[2] For a very short time in 1974, Mercury was thought to have a moon.

Venus also has no moons,[3] 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 more than 20 known co-orbitals, including the asteroids 3753 Cruithne and 469219 Kamoʻoalewa, and the occasional temporary satellite, like 2020 CD3; however, since they do not permanently 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 95 moons with known orbits; 72 of them have received permanent designations, and 57 have been named. Its eight regular moons are grouped into the planet-sized Galilean moons and the far smaller Amalthea group. They were named after lovers of Zeus, the Greek equivalent of Jupiter. Among them is Ganymede, the largest and most massive moon in the Solar System. Its 87 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 146 moons with known orbits; 66 of them have received permanent designations, and 63 have been named. 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 122 are irregular, and classified by their orbital characteristics into Inuit, Norse, and Gallic groups, and their names are chosen from the corresponding mythologies the groups are named after. 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 known moons, five of which are massive enough to have achieved hydrostatic equilibrium. There are 13 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 known moons; 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 seven 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] Eris has one large known moon, Dysnomia. Accurately determining its size is difficult: one indicative estimate of its radius is 350±57.5 km.[7]

Two objects were named as dwarf planets, under the expectation that they would prove to be so (though this remains uncertain). Haumea has two moons, Hiʻiaka and Namaka, of radii ~195 and ~100 km, respectively.[8] Makemake has one moon, discovered in April 2016.

A number of other objects in the Kuiper belt and scattered disk may turn out to be dwarf planets. Orcus, Quaoar, Gonggong, and Sedna are generally agreed to be dwarf planets among astronomers, and all but Sedna are known to have moons.[9] A number of other smaller objects, such as Salacia, Varda, and 2013 FY27, also have moons, although their dwarf planethood is more doubtful. This list includes all objects with a best estimated diameter above 700 km, including 2003 AZ84 whose satellite has not been seen since its initial discovery.

As of October 2022, 365 asteroid moons and 128 trans-Neptunian moons (including those of Pluto and the other dwarf planets) had been discovered.[10]

Summary – number of moons
Planet Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
Number of moons 0 0 1 2 95 146 27 14
Likely dwarf planets Ceres Orcus Pluto Haumea Quaoar Makemake Gonggong Eris Sedna
Number of moons 0 1 5 2 1 1 1 1 0
Possible dwarf planet candidates 2003 AZ84 Ixion Salacia 2002 MS4 Varda 2002 AW197 2013 FY27
Number of moons 1 0 1 0 1 0 1
Minor planet
See list

Due to Earth's varying distance from these planets (as well as their distance to the Sun), the limits at which we are able to detect new moons are very inconsistent. As the below graph demonstrates, the absolute magnitude (total inherent brightness, abbreviated H) of moons we have detected around planets peaks at H = 17 for Jupiter, H = 16 for Saturn, H = 13 for Uranus, and H = 11 for Neptune. Smaller moons may (and most likely do) exist around each of these planets, but are currently undetectable from Earth. Although spacecraft have visited all of these planets, Earth-based telescopes continue to outperform them in moon-detection ability due to their greater availability for wide-field surveys.

Planetary moons by absolute magnitude

List

This is a list of the recognized moons of the planets and of the largest potential dwarf planets of the Solar System, ordered by their official Roman numeral designations. Moons that do not yet have official Roman numeral designations (because their orbits are not yet known well enough) are listed after those that do.

The 19 moons that are known to be 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 a moon's speed depends both on the mass of its primary and its distance from it.

Satellites of planets
Satellite of Earth Satellites of Jupiter Satellites of Uranus
Satellites of Mars Satellites of Saturn Satellites of Neptune
Satellites of generally agreed dwarf planets
Satellite of Orcus Satellites of Pluto Satellites of Haumea
Satellite of Quaoar Satellite of Makemake Satellite of Gonggong
Satellite of Eris
Satellites of other dwarf planet candidates
Satellite of 2003 AZ84 Satellite of Salacia Satellite of Varda
Satellite of 2013 FY27
Name Image Parent Numeral Mean radius (km) Orbital semi-major axis (km) Sidereal period (d)
(r = retrograde)		 Discovery year Year Announced Discovered by Notes Ref(s)
Moon
EarthI (1)1,738384,39927.321582 PrehistoricPrehistory—Synchronous rotation (Binary)[11]
Phobos
MarsI (1)11.2679,3800.319 18771877HallSynchronous rotation[12][13][14]
Deimos
MarsII (2)6.2±0.1823,4601.262 18771877HallSynchronous rotation[12][13][14]
Io
JupiterI (1)1,821.6±0.5421,8001.769 16101610GalileoMain-group moon (Galilean)[14][15]
Europa
JupiterII (2)1,560.8±0.5671,1003.551 16101610GalileoMain-group moon (Galilean)[14][15]
Ganymede
JupiterIII (3)2,634.1±0.31,070,4007.155 16101610GalileoMain-group moon (Galilean)[14][15]
Callisto
JupiterIV (4)2,410.3±1.51,882,70016.69 16101610GalileoMain-group moon (Galilean)[14][15]
Amalthea
JupiterV (5)83.5±2181,4000.498 18921892BarnardInner moon (Amalthea)[13][14][16]
Himalia
JupiterVI (6)69.811,461,000250.56 19041905PerrinePrograde irregular (Himalia)[13][14][17][18]
Elara
JupiterVII (7)43 11,741,000259.64 19051905PerrinePrograde irregular (Himalia)[13][14][19]
Pasiphae
JupiterVIII (8)30 23,624,000743.63 (r) 19081908MelotteRetrograde irregular (Pasiphae)[13][14][20]
Sinope
JupiterIX (9)19 23,939,000758.90 (r) 19141914NicholsonRetrograde irregular (Pasiphae)[13][14][21]
Lysithea
JupiterX (10)18 11,717,000259.20 19381938NicholsonPrograde irregular (Himalia)[13][14][22]
Carme
JupiterXI (11)23 23,404,000734.17 (r) 19381938NicholsonRetrograde irregular (Carme)[13][14][22]
Ananke
JupiterXII (12)14 21,276,000629.77 (r) 19511951NicholsonRetrograde irregular (Ananke)[13][14][23]
Leda
JupiterXIII (13)10 11,165,000240.92 19741974KowalPrograde irregular (Himalia)[13][14][24]
Thebe
JupiterXIV (14)49.3±2.0221,9000.675 19791980Synnott (Voyager 1)Inner moon (Amalthea)[13][14][25]
Adrastea
JupiterXV (15)8.2±2.0129,0000.298 19791979Jewitt, Danielson (Voyager 1)Inner moon (Amalthea)[13][14][26]
Metis
JupiterXVI (16)21.5±2.0128,0000.295 19791980Synnott (Voyager 1)Inner moon (Amalthea)[13][14][27]
Callirrhoe
JupiterXVII (17)4.5 24,103,000758.77 (r) 19992000Scotti, Spahr, McMillan, Larsen, Montani, Gleason, GehrelsRetrograde irregular (Pasiphae)[13][14][28]
Themisto
JupiterXVIII (18)4 7,284,000130.02 1975/20001975/2000Kowal and Roemer (original); Sheppard, Jewitt, Fernández, Magnier (rediscovery)Prograde irregular (Themisto)[13][14][29][30]
Megaclite
JupiterXIX (19)2.7 23,493,000752.86 (r) 20002001Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Pasiphae)[13][14][31]
Taygete
JupiterXX (20)2.5 23,280,000732.41 (r) 20002001Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Carme)[13][14][31]
Chaldene
JupiterXXI (21)1.9 23,100,000723.72 (r) 20002001Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Carme)[13][14][31]
Harpalyke
JupiterXXII (22)2.2 20,858,000623.32 (r) 20002001Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Ananke)[13][14][31]
Kalyke
JupiterXXIII (23)2.6 23,483,000742.06 (r) 20002001Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Carme)[13][14][31]
Iocaste
JupiterXXIV (24)2.6 21,060,000631.60 (r) 20002001Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Ananke)[13][14][31]
Erinome
JupiterXXV (25)1.6 23,196,000728.46 (r) 20002001Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Carme)[13][14][31]
Isonoe
JupiterXXVI (26)1.9 23,155,000726.23 (r) 20002001Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Carme)[13][14][31]
Praxidike
JupiterXXVII (27)3.5 20,908,000625.39 (r) 20002001Sheppard, Jewitt, Fernández, Magnier, Dahm, EvansRetrograde irregular (Ananke)[13][14][31]
Autonoe
JupiterXXVIII (28)2 24,046,000760.95 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Pasiphae)
Thyone
JupiterXXIX (29)2 20,939,000627.21 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Ananke)[13][14][32]
Hermippe
JupiterXXX (30)2 21,131,000633.9 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Ananke)[13][14][32]
Aitne
JupiterXXXI (31)1.5 23,229,000730.18 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Carme)[13][14][32]
Eurydome
JupiterXXXII (32)1.5 22,865,000717.33 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Pasiphae)[13][14][32]
Euanthe
JupiterXXXIII (33)1.5 20,797,000620.49 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Ananke)[13][14][32]
Euporie
JupiterXXXIV (34)1 19,304,000550.74 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Ananke)[13][14][32]
Orthosie
JupiterXXXV (35)1 20,720,000622.56 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Ananke)[13][14][32]
Sponde
JupiterXXXVI (36)1 23,487,000748.34 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Pasiphae)[13][14][32]
Kale
JupiterXXXVII (37)1 23,217,000729.47 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Carme)[13][14][32]
Pasithee
JupiterXXXVIII (38)1 23,004,000719.44 (r) 20012002Sheppard, Jewitt, KleynaRetrograde irregular (Carme)[13][14][32]
Hegemone JupiterXXXIX (39)1.5 23,577,000739.88 (r) 20032003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Pasiphae)[13][14]
Mneme
JupiterXL (40)1 21,035,000620.04 (r) 20032003Gladman, AllenRetrograde irregular (Ananke)[13][14]
Aoede JupiterXLI (41)2 23,980,000761.50 (r) 20032003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Pasiphae)[13][14]
Thelxinoe JupiterXLII (42)1 21,164,000628.09 (r) 20032004Sheppard, Jewitt, Kleyna, Gladman, Kavelaars, Petit, AllenRetrograde irregular (Ananke)[13][14]
Arche
JupiterXLIII (43)1.5 23,355,000731.95 (r) 20022002Sheppard, Meech, Hsieh, Tholen, TonryRetrograde irregular (Carme)[13][14][32]
Kallichore JupiterXLIV (44)1 23,288,000728.73 (r) 20032003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Carme)[13][14]
Helike
JupiterXLV (45)2 21,069,000626.32 (r) 20032003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Ananke)[13][14]
Carpo
JupiterXLVI (46)1.5 17,058,000456.30 20032003Sheppard, Gladman, Kavelaars, Petit, Allen, Jewitt, KleynaPrograde irregular (Carpo)[13][14]
Eukelade
JupiterXLVII (47)2 23,328,000730.47 (r) 20032003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Carme)[13][14]
Cyllene JupiterXLVIII (48)1 23,809,000752 (r) 20032003Sheppard, Jewitt, KleynaRetrograde irregular (Pasiphae)[13][14]
Kore
JupiterXLIX (49)1 24,543,000779.17 (r) 20032003Sheppard, Jewitt, KleynaRetrograde irregular (Pasiphae)[13][14]
Herse JupiterL (50)1 22,983,000714.51 (r) 20032003Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, AllenRetrograde irregular (Carme)[13][14]
S/2010 J 1
JupiterLI (51)1 23,314,300723.2 (r) 20102011Jacobson, Brozović, Gladman, AlexandersenRetrograde irregular (Carme)[33]
S/2010 J 2
JupiterLII (52)0.5 20,307,200588.1 (r) 20102011VeilletRetrograde irregular (Ananke)[33]
Dia
JupiterLIII (53)2 12,118,000287.0 20002001Sheppard, Jewitt, Kleyna, Fernández, HsiehPrograde irregular (Himalia)[33]
S/2016 J 1
JupiterLIV (54)1 20,595,500602.7 (r) 20162017SheppardRetrograde irregular (Ananke)[33]
S/2003 J 18
JupiterLV (55)1 20,274,000588.0 (r) 20032003Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, AllenRetrograde irregular (Ananke)[33]
S/2011 J 2 JupiterLVI (56)0.5 23,329,700726.8 (r) 20112012SheppardRetrograde irregular (Pasiphae)[33]
Eirene JupiterLVII (57)2 23,731,800759.7 (r) 20032003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Carme)[33]
Philophrosyne JupiterLVIII (58)1 22,820,000701.3 (r) 20032003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Pasiphae)[33]
S/2017 J 1
JupiterLIX (59)2 23,484,000734.2 (r) 20172017SheppardRetrograde irregular (Pasiphae)[33]
Eupheme
JupiterLX (60)1 21,199,710627.8 (r) 20032003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Ananke)[33]
S/2003 J 19 JupiterLXI (61)1 22,757,000697.6 (r) 20032003Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, AllenRetrograde irregular (Carme)[33]
Valetudo
JupiterLXII (62)0.5 18,928,100532.0 20162018SheppardPrograde irregular (Valetudo)[33]
S/2017 J 2
JupiterLXIII (63)1 23,241,000723.8 (r) 20172018SheppardRetrograde irregular (Carme)[33]
S/2017 J 3
JupiterLXIV (64)1 20,639,300605.8 (r) 20172018SheppardRetrograde irregular (Ananke)[33]
Pandia
JupiterLXV (65)1.5 11,494,800251.8 20172018SheppardPrograde irregular (Himalia)[33]
S/2017 J 5 JupiterLXVI (66)1 23,169,400720.5 (r) 20172018SheppardRetrograde irregular (Carme)[33]
S/2017 J 6 JupiterLXVII (67)1 22,394,700684.7 (r) 20172018SheppardRetrograde irregular (Pasiphae)[33]
S/2017 J 7 JupiterLXVIII (68)1 20,571,500602.8 (r) 20172018SheppardRetrograde irregular (Ananke)[33]
S/2017 J 8
JupiterLXIX (69)0.5 23,174,400720.7 (r) 20172018SheppardRetrograde irregular (Carme)[33]
S/2017 J 9 JupiterLXX (70)1 21,430,000640.9 (r) 20172018SheppardRetrograde irregular (Ananke)[33]
Ersa
JupiterLXXI (71)1.511,453,000250.4 20182018SheppardPrograde irregular (Himalia)[33]
S/2011 J 1 JupiterLXXII (72)0.5 20,155,300580.7 (r) 20112012SheppardRetrograde irregular (Carme)[33]
S/2003 J 2
Jupiter—1 20,554,400602.02 (r) 20032003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Ananke)[13][14]
S/2003 J 4
Jupiter—1 22,048,600668.85 (r) 20032003Sheppard, Jewitt, Kleyna, Fernández, HsiehRetrograde irregular (Pasiphae)[13][14]
S/2003 J 9
Jupiter—0.5 24,168,700767.6 (r) 20032003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Carme)[13][34]
S/2003 J 10
Jupiter—1 22,896,000707.78 (r) 20032003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Carme?)[13][14]
S/2003 J 12
Jupiter—0.5 21,557,700646.64 (r) 20032003Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Ananke)[13][14]
S/2003 J 16
Jupiter—1 20,512,500600.18 (r) 20032003Gladman, Sheppard, Jewitt, Kleyna, Kavelaars, Petit, AllenRetrograde irregular (Ananke)[13][35]
S/2003 J 23
Jupiter—1 24,678,100792.00 (r) 20032004Sheppard, Jewitt, Kleyna, FernándezRetrograde irregular (Pasiphae)[13][14]
S/2003 J 24 Jupiter—1.5 23,088,000715.4 (r) 20032021Sheppard, Jewitt, Kleyna, Gladman, VeilletRetrograde irregular (Carme)[36]
S/2011 J 3 Jupiter—1.5 11,797,200261.77 20112022SheppardPrograde irregular (Himalia)[37]
S/2016 J 3 Jupiter—1 22,213,500676.37 (r) 20162023SheppardRetrograde irregular (Carme)[38]
S/2016 J 4 Jupiter—1 23,664,100743.69 (r) 20162023SheppardRetrograde irregular (Pasiphae)[39]
S/2018 J 2 Jupiter—1.5 11,467,500250.88 20182022SheppardPrograde irregular (Himalia)[40]
S/2018 J 3 Jupiter—0.5 22,826,600704.56 (r) 20182023SheppardRetrograde irregular (Carme)[41]
S/2018 J 4 Jupiter—1 16,504,300433.16 20182023SheppardPrograde irregular (Carpo)[42]
S/2021 J 1 Jupiter—0.5 20,667,200606.99 (r) 20212023SheppardRetrograde irregular (Ananke)[43]
S/2021 J 2 Jupiter—0.5 21,140,600627.96 (r) 20212023SheppardRetrograde irregular (Ananke)[44]
S/2021 J 3 Jupiter—1 21,495,700643.85 (r) 20212023SheppardRetrograde irregular (Ananke)[45]
S/2021 J 4 Jupiter—0.5 22,946,700710.13 (r) 20212023SheppardRetrograde irregular (Carme)[46]
S/2021 J 5 Jupiter—1 22,831,800704.80 (r) 20212023Sheppard, Tholen, TrujilloRetrograde irregular (Carme)[47]
S/2021 J 6 Jupiter—0.5 23,427,200732.55 (r) 20212023Sheppard, Tholen, TrujilloRetrograde irregular (Carme)[48]
S/2022 J 1 Jupiter—0.5 22,015,500667.34 (r) 20222023SheppardRetrograde irregular (Carme)[49]
S/2022 J 2 Jupiter—0.5 22,413,200685.51 (r) 20222023SheppardRetrograde irregular (Carme)[50]
S/2022 J 3 Jupiter—0.5 20,912,400617.82 (r) 20222023SheppardRetrograde irregular (Ananke)[51]
Mimas
SaturnI (1)198.2±0.4185,5400.942 17891789HerschelMain-group moon[13][14]
Enceladus
SaturnII (2)252.1±0.2238,0401.370 17891789HerschelMain-group moon[13][14]
Tethys
SaturnIII (3)533.1±0.7294,6701.888 16841686CassiniMain-group moon (Sidera Lodoicea)[13][14]
Dione
SaturnIV (4)561.4±0.4377,4202.737 16841686CassiniMain-group moon (Sidera Lodoicea)[13][14]
Rhea
SaturnV (5)763.8±1.0527,0704.518 16721673CassiniMain-group moon (Sidera Lodoicea)[13][14]
Titan
SaturnVI (6)2,574.73±0.091,221,87015.95 16551656HuygensMain-group moon[13][14]
Hyperion
SaturnVII (7)1351,500,88021.28 18481848W.Bond, G. Bond, and LassellMain-group moon[13][14]
Iapetus
SaturnVIII (8)735.6±1.53,560,84079.33 16711673CassiniMain-group moon (Sidera Lodoicea)[13][14]
Phoebe
SaturnIX (9)106.5±0.712,947,780550.31 (r) 18981899PickeringRetrograde irregular (Norse)[13][14]
Janus
SaturnX (10)89.5±1.4151,4600.695 19661967Dollfus; Voyager 1 (confirmed)Inner moon (co-orbital)[13][14]
Epimetheus SaturnXI (11)58.1±1.8151,4100.694 19661967Walker; Voyager 1 (confirmed)Inner moon (co-orbital)[13][14]
Helene
SaturnXII (12)17.6±0.4377,4202.737 19801980Laques, LecacheuxMain-group trojan[13][14]
Telesto
SaturnXIII (13)12.4±0.4294,7101.888 19801980Smith, Reitsema, Larson, Fountain (Voyager 1)Main-group trojan[13][14]
Calypso
SaturnXIV (14)10.7±0.7294,7101.888 19801980Pascu, Seidelmann, Baum, CurrieMain-group trojan[13][14]
Atlas
SaturnXV (15)15.1±0.9137,6700.602 19801980Terrile (Voyager 1)Inner moon (shepherd)[13][14]
Prometheus
SaturnXVI (16)43.1±2.7139,3800.613 19801980Collins (Voyager 1)Inner moon (shepherd)[13][14]
Pandora
SaturnXVII (17)40.7±1.5141,7200.629 19801980Collins (Voyager 1)Inner moon (shepherd)[13][14]
Pan
SaturnXVIII (18)14.1133,5800.575 19811990Showalter (Voyager 2)Inner moon (shepherd)[13][14]
Ymir
SaturnXIX (19)9 23,140,4001,315.58 (r) 20002000GladmanRetrograde irregular (Norse)[13][14]
Paaliaq
SaturnXX (20)11 15,200,000686.95 20002000GladmanPrograde irregular (Inuit) (Paaliaq)[13][14]
Tarvos
SaturnXXI (21)7.5 17,983,000926.23 20002000Gladman, KavelaarsPrograde irregular (Gallic)[13][14]
Ijiraq
SaturnXXII (22)6 11,124,000451.42 20002000Gladman, KavelaarsPrograde irregular (Inuit) (Kiviuq)[13][14]
Suttungr
SaturnXXIII (23)3.5 19,459,0001,016.67 (r) 20002000Gladman, KavelaarsRetrograde irregular (Norse)[13][14]
Kiviuq
SaturnXXIV (24)8 11,110,000449.22 20002000GladmanPrograde irregular (Inuit) (Kiviuq)[13][14]
Mundilfari
SaturnXXV (25)3.5 18,628,000952.77 (r) 20002000Gladman, KavelaarsRetrograde irregular (Norse)[13][14]
Albiorix
SaturnXXVI (26)16 16,182,000783.45 20002000Holman, SpahrPrograde irregular (Gallic)[13][14]
Skathi
SaturnXXVII (27)4 15,540,000728.20 (r) 20002000Gladman, KavelaarsRetrograde irregular (Norse)[13][14]
Erriapus
SaturnXXVIII (28)5 17,343,000871.19 20002000Gladman, KavelaarsPrograde irregular (Gallic)[13][14]
Siarnaq
SaturnXXIX (29)20 18,015,400896.44 20002000Gladman, KavelaarsPrograde irregular (Inuit) (Siarnaq)[13][14]
Thrymr
SaturnXXX (30)3.5 20,314,0001,094.11 (r) 20002000Gladman, KavelaarsRetrograde irregular (Norse)[13][14]
Narvi
SaturnXXXI (31)3.5 19,007,0001,003.86 (r) 20032003Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[13][14]
Methone
SaturnXXXII (32)1.45194,4401.010 20042004Porco, Charnoz, Brahic, Dones (Cassini–Huygens)Alkyonide moon[14]
Pallene
SaturnXXXIII (33)2.22212,2801.154 20042004Gordon, Murray, Beurle, et al. (Cassini–Huygens)Alkyonide moon[14]
Polydeuces
SaturnXXXIV (34)1.3377,2002.737 20042004Porco et al. (Cassini–Huygens)Main-group trojan[14]
Daphnis
SaturnXXXV (35)3.8±0.8136,5000.594 20052005Porco et al. (Cassini–Huygens)Inner moon (shepherd)[14]
Aegir SaturnXXXVI (36)3 20,751,0001,117.52 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[13][14]
Bebhionn
SaturnXXXVII (37)3 17,119,000834.84 20042005Sheppard, Jewitt, Kleyna, MarsdenPrograde irregular (Gallic)[13][14]
Bergelmir
SaturnXXXVIII (38)3 19,336,0001,005.74 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[13][14]
Bestla
SaturnXXXIX (39)3.5 20,192,0001,088.72 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[13][14]
Farbauti SaturnXL (40)2.5 20,377,0001,085.55 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[13][14]
Fenrir SaturnXLI (41)2 22,454,0001,260.35 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[13][14]
Fornjot
SaturnXLII (42)3 25,146,0001,494.2 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[13][14]
Hati
SaturnXLIII (43)3 19,846,0001,038.61 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[13][14]
Hyrrokkin
SaturnXLIV (44)4 18,437,000931.86 (r) 20042006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[14]
Kari
SaturnXLV (45)3.5 22,089,0001,230.97 (r) 20062006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[14]
Loge
SaturnXLVI (46)3 23,058,0001,311.36 (r) 20062006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[14]
Skoll
SaturnXLVII (47)3 17,665,000878.29 (r) 20062006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[14]
Surtur SaturnXLVIII (48)3 22,704,0001,297.36 (r) 20062006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[14]
Anthe
SaturnXLIX (49)0.9197,7001.0365 20072007Porco et al. (Cassini–Huygens)Alkyonide moon[52]
Jarnsaxa SaturnL (50)3 18,811,000964.74 (r) 20062006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[14]
Greip
SaturnLI (51)3 18,206,000921.19 (r) 20062006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[14]
Tarqeq
SaturnLII (52)3.5 18,009,000887.48 20072007Sheppard, Jewitt, KleynaPrograde irregular (Inuit) (Siarnaq)[14]
Aegaeon
SaturnLIII (53)0.33 167,5000.808 20082009Cassini Imaging Science Team Cassini–HuygensG-ring moonlet[53][54]
Gridr SaturnLIV (54)3 19,418,0001,010.55 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[55]
Angrboda SaturnLV (55)3 20,636,0001,107.13 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[56]
Skrymir SaturnLVI (56)4 21,163,0001,149.82 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[57]
Gerd SaturnLVII (57)4 21,174,0001,150.69 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[58]
S/2004 S 26 SaturnLVIII (58)4 26,676,0001,627.18 (r) 20042019Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[59]
Eggther SaturnLIX (59)6 19,976,0001,054.45 (r) 20042019Sheppard, Jewitt, Kleyna, Marsden, JacobsonRetrograde irregular (Norse)[60]
S/2004 S 29 SaturnLX (60)4 16,981,000826.44 20042019Sheppard, Jewitt, Kleyna, MarsdenPrograde irregular (Gallic)[61]
Beli SaturnLXI (61)3 20,396,0001,087.84 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[62]
Gunnlod SaturnLXII (62)4 21,214,0001,153.96 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[63]
Thiazzi SaturnLXIII (63)4 24,168,0001,403.18 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[64]
S/2004 S 34 SaturnLXIV (64)3 24,299,0001,414.59 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[65]
Alvaldi SaturnLXV (65)6 22,412,0001,253.08 (r) 20042019Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[66]
Geirrod SaturnLXVI (66)4 21,908,0001,211.02 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[67]
S/2004 S 7 Saturn—3 20,999,0001,140.24 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse?)[13][14]
S/2004 S 12 Saturn—2.5 19,878,0001,046.19 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse)[13][14]
S/2004 S 13 Saturn—3 18,404,000933.48 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse?)[13][14]
S/2004 S 17 Saturn—2 19,447,0001,014.70 (r) 20042005Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse?)[13][14]
S/2004 S 21 Saturn—3 22,645,0001,272.61 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[68]
S/2004 S 24 Saturn—3 22,901,0001,294.25 20042019Sheppard, Jewitt, Kleyna, MarsdenPrograde irregular (group unknown, possibly Gallic)[69]
S/2004 S 28 Saturn—4 22,020,0001,220.31 (r) 20042019Sheppard, Jewitt, Kleyna, MarsdenRetrograde irregular (Norse?)[70]
S/2004 S 31 Saturn—4 17,568,000869.65 20042019Sheppard, Jewitt, Kleyna, MarsdenPrograde irregular (Inuit) (Siarnaq)[71]
S/2004 S 36 Saturn—3 23,192,0001,319.07 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[72]
S/2004 S 37 Saturn—4 15,892,000748.18 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[73]
S/2004 S 39 Saturn—3 23,575,0001,351.83 (r) 20042019Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[74]
S/2004 S 40 Saturn—2 16,075,600765.92 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[75]
S/2004 S 41 Saturn—2 18,095,000895.76 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[76]
S/2004 S 42 Saturn—2 18,240,800910.61 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[77]
S/2004 S 43 Saturn—2 18,935,000971.48 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[78]
S/2004 S 44 Saturn—2.5 19,515,4001,014.98 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[79]
S/2004 S 45 Saturn—2 19,693,6001,058.95 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[80]
S/2004 S 46 Saturn—1.5 20,513,0001,107.57 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[81]
S/2004 S 47 Saturn—2 16,050,600755.69 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[82]
S/2004 S 48 Saturn—2 22,136,7001,248.52 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[83]
S/2004 S 49 Saturn—2 22,399,7001,290.34 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[84]
S/2004 S 50 Saturn—1.5 22,346,0001,219.11 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[85]
S/2004 S 51 Saturn—2 25,208,2001,544.65 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[86]
S/2004 S 52 Saturn—1.5 26,448,1001,573.49 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[87]
S/2004 S 53 Saturn—2 23,279,8001,367.72 (r) 20042023Sheppard et al.Retrograde irregular (Norse)[88]
S/2005 S 4 Saturn—2.5 11,324,500448.63 20052023Sheppard et al.Prograde irregular (Inuit) (Kiviuq)[89]
S/2005 S 5 Saturn—1.5 21,366,2001,138.62 (r) 20052023Sheppard et al.Retrograde irregular (Norse)[90]
S/2006 S 1 Saturn—3 18,790,000963.37 (r) 20062006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[14]
S/2006 S 3 Saturn—3 22,096,0001,227.21 (r) 20062006Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[14]
S/2006 S 9 Saturn—1.5 14,406,600648.71 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[91]
S/2006 S 10 Saturn—1.5 18,979,900965.26 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[92]
S/2006 S 11 Saturn—1.5 19,711,9001,018.45 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[93]
S/2006 S 12 Saturn—2 19,569,8001,043.16 20062023Sheppard et al.Prograde irregular (group unknown, possibly Gallic)[94]
S/2006 S 13 Saturn—2 19,953,8001,061.74 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[95]
S/2006 S 14 Saturn—1.5 21,062,1001,150.64 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[96]
S/2006 S 15 Saturn—2 21,799,4001,183.57 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[97]
S/2006 S 16 Saturn—1.5 21,720,7001,217.36 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[98]
S/2006 S 17 Saturn—2 22,384,9001,262.48 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[99]
S/2006 S 18 Saturn—2 22,760,7001,324.09 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[100]
S/2006 S 19 Saturn—2 23,801,1001,324.68 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[101]
S/2006 S 20 Saturn—2.5 13,193,800563.89 (r) 20062023Sheppard et al.Retrograde irregular (Norse)[102]
S/2007 S 2 Saturn—3 16,725,000808.08 (r) 20072007Sheppard, Jewitt, KleynaRetrograde irregular (Norse)[14]
S/2007 S 3 Saturn—3 18,975,000977.8 (r) 20072007Sheppard, Jewitt, KleynaRetrograde irregular (Norse?)[14]
S/2007 S 5 Saturn—2 15,835,700748.50 (r) 20072023Sheppard et al.Retrograde irregular (Norse)[103]
S/2007 S 6 Saturn—1.5 18,544,900944.31 (r) 20072023Sheppard et al.Retrograde irregular (Norse)[104]
S/2007 S 7 Saturn—2 15,931,700742.79 (r) 20072023Sheppard et al.Retrograde irregular (Norse)[105]
S/2007 S 8 Saturn—2 17,049,000826.94 20072023Sheppard et al.Prograde irregular (Gallic)[106]
S/2007 S 9 Saturn—2 20,174,6001,099.69 (r) 20072023Sheppard et al.Retrograde irregular (Norse)[107]
S/2009 S 1
Saturn—0.15 117,0000.471 20092009Cassini Imaging Science Team Cassini–HuygensB-ring moonlet[108]
S/2019 S 1
Saturn—3 11,221,000443.8 20192021Ashton, Gladman, Petit, AlexandersenPrograde irregular (Inuit) (Kiviuq)[109]
S/2019 S 2 Saturn—1.5 16,559,900796.22 (r) 20192023Ashton et al.Retrograde irregular (Norse)[110]
S/2019 S 3 Saturn—2 17,077,200836.68 (r) 20192023Ashton et al.Retrograde irregular (Norse)[111]
S/2019 S 4 Saturn—1.5 17,956,700898.40 (r) 20192023Ashton et al.Retrograde irregular (Norse)[112]
S/2019 S 5 Saturn—1.5 19,076,900971.54 (r) 20192023Ashton et al.Retrograde irregular (Norse)[113]
S/2019 S 6 Saturn—2 18,198,700905.41 20192023Ashton et al.Prograde irregular (Inuit) (Siarnaq)[114]
S/2019 S 7 Saturn—2 20,181,3001,093.86 (r) 20192023Ashton et al.Retrograde irregular (Norse)[115]
S/2019 S 8 Saturn—2 20,284,4001,080.60 (r) 20192023Ashton et al.Retrograde irregular (Norse)[116]
S/2019 S 9 Saturn—2 20,359,0001,104.27 (r) 20192023Ashton et al.Retrograde irregular (Norse)[117]
S/2019 S 10 Saturn—1.5 20,713,4001,129.53 (r) 20192023Ashton et al.Retrograde irregular (Norse)[118]
S/2019 S 11 Saturn—2 20,663,7001,097.33 (r) 20192023Ashton et al.Retrograde irregular (Norse)[119]
S/2019 S 12 Saturn—2 20,904,5001,130.40 (r) 20192023Ashton et al.Retrograde irregular (Norse)[120]
S/2019 S 13 Saturn—1.5 20,965,8001,132.90 (r) 20192023Ashton et al.Retrograde irregular (Norse)[121]
S/2019 S 14 Saturn—2 17,853,000902.00 20192023Ashton et al.Prograde irregular (Inuit) (Siarnaq)[122]
S/2019 S 15 Saturn—1.5 21,189,7001,156.21 (r) 20192023Ashton et al.Retrograde irregular (Norse)[123]
S/2019 S 16 Saturn—1.5 23,266,7001,360.26 (r) 20192023Ashton et al.Retrograde irregular (Norse)[124]
S/2019 S 17 Saturn—2 22,724,1001,322.15 (r) 20192023Ashton et al.Retrograde irregular (Norse)[125]
S/2019 S 18 Saturn—1.5 23,140,7001,349.74 (r) 20192023Ashton et al.Retrograde irregular (Norse)[126]
S/2019 S 19 Saturn—1.5 23,047,2001,342.57 (r) 20192023Ashton et al.Retrograde irregular (Norse)[127]
S/2019 S 20 Saturn—1.5 23,678,6001,343.58 (r) 20192023Ashton et al.Retrograde irregular (Norse)[128]
S/2019 S 21 Saturn—2 26,439,0001,572.06 (r) 20192023Ashton et al.Retrograde irregular (Norse)[129]
S/2020 S 1 Saturn—2 11,338,700450.83 20202023Ashton et al.Prograde irregular (Inuit) (Kiviuq)[130]
S/2020 S 2 Saturn—1.5 17,869,300907.00 (r) 20202023Ashton et al.Retrograde irregular (Norse)[131]
S/2020 S 3 Saturn—1.5 18,054,700896.35 20202023Ashton et al.Prograde irregular (Inuit) (Siarnaq)[132]
S/2020 S 4 Saturn—1.5 18,235,500910.34 20202023Ashton et al.Prograde irregular (Gallic)[133]
S/2020 S 5 Saturn—1.5 18,391,300933.52 20202023Ashton et al.Prograde irregular (Inuit) (Siarnaq)[134]
S/2020 S 6 Saturn—1.5 21,265,3001,149.11 (r) 20202023Ashton et al.Retrograde irregular (Norse)[135]
S/2020 S 7 Saturn—1.5 17,400,000844.85 (r) 20202023Ashton et al.Retrograde irregular (Norse)[136]
S/2020 S 8 Saturn—1.5 21,966,7001,201.72 (r) 20202023Ashton et al.Retrograde irregular (Norse)[137]
S/2020 S 9 Saturn—2 25,434,1001,565.23 (r) 20202023Ashton et al.Retrograde irregular (Norse)[138]
S/2020 S 10 Saturn—1.5 25,314,8001,479.87 (r) 20202023Ashton et al.Retrograde irregular (Norse)[139]
Ariel
UranusI (1)578.9±0.6190,9002.520 18511851LassellMain-group moon[13][14]
Umbriel
UranusII (2)584.7±2.8266,0004.144 18511851LassellMain-group moon[13][14]
Titania
UranusIII (3)788.9±1.8436,3008.706 17871787HerschelMain-group moon[13][14]
Oberon
UranusIV (4)761.4±2.6583,50013.46 17871787HerschelMain-group moon[13][14]
Miranda
UranusV (5)235.8±0.7129,9001.413 19481949KuiperMain-group moon[13][14]
Cordelia
UranusVI (6)20.1±349,8000.335 19861986Terrile (Voyager 2)Inner moon (shepherd)[13][14]
Ophelia
UranusVII (7)21.4±453,8000.376 19861986Terrile (Voyager 2)Inner moon (shepherd)[13][14]
Bianca
UranusVIII (8)25.7±259,2000.435 19861986Smith (Voyager 2)Inner moon[13][14]
Cressida
UranusIX (9)39.8±261,8000.464 19861986Synnott (Voyager 2)Inner moon[13][14]
Desdemona
UranusX (10)32±462,7000.474 19861986Synnott (Voyager 2)Inner moon[13][14]
Juliet
UranusXI (11)46.8±464,4000.493 19861986Synnott (Voyager 2)Inner moon[13][14]
Portia
UranusXII (12)67.6±4.066,1000.513 19861986Synnott (Voyager 2)Inner moon[13][14]
Rosalind
UranusXIII (13)36±669,9000.558 19861986Synnott (Voyager 2)Inner moon[13][14]
Belinda
UranusXIV (14)40.3±875,3000.624 19861986Synnott (Voyager 2)Inner moon[13][14]
Puck
UranusXV (15)81±286,0000.762 19851986Synnott (Voyager 2)Inner moon[13][14]
Caliban
UranusXVI (16)36.47,231,100579.73 (r) 19971997Gladman, Nicholson, Burns, KavelaarsRetrograde irregular[140][14]
Sycorax
UranusXVII (17)9312,179,4001,288.38 (r) 19971997Gladman, Nicholson, Burns, KavelaarsRetrograde irregular[140][14]
Prospero
UranusXVIII (18)25 16,256,0001,978.29 (r) 19991999Gladman, Holman, Kavelaars, Petit, SchollRetrograde irregular[13][14]
Setebos
UranusXIX (19)24 17,418,0002,225.21 (r) 19991999Gladman, Holman, Kavelaars, Petit, SchollRetrograde irregular[13][14]
Stephano
UranusXX (20)168,004,000677.36 (r) 19991999Gladman, Holman, Kavelaars, Petit, SchollRetrograde irregular[13][14]
Trinculo UranusXXI (21)9.58,504,000749.24 (r) 20012002Holman, Kavelaars, MilisavljevicRetrograde irregular[13][14]
Francisco UranusXXII (22)114,276,000266.56 (r) 20012003Holman, Kavelaars, Milisavljevic, GladmanRetrograde irregular[13][14]
Margaret
UranusXXIII (23)1014,345,0001,687.01 20032003Sheppard, JewittPrograde irregular[13][14]
Ferdinand
UranusXXIV (24)1020,901,0002,887.21 (r) 20012003Holman, Kavelaars, Milisavljevic, et al.Retrograde irregular[13][14]
Perdita
UranusXXV (25)15 76,4170.638 19861999/2003Karkoschka (Voyager 2)Inner moon[14]
Mab
UranusXXVI (26)1297,7360.923 20032003Showalter, LissauerInner moon[14]
Cupid
UranusXXVII (27)9 74,3920.613 20032003Showalter, LissauerInner moon[14]
Triton
NeptuneI (1)1,353.4±0.9354,8005.877 (r) 18461846LassellRetrograde irregular[13][14]
Nereid
NeptuneII (2)170±255,513,820360.14 19491949KuiperPrograde irregular[141][14]
Naiad
NeptuneIII (3)33±348,2240.294 19891989Terrile (Voyager 2)Inner moon[13][14]
Thalassa
NeptuneIV (4)41±350,0750.311 19891989Terrile (Voyager 2)Inner moon[13][14]
Despina
NeptuneV (5)78±4.752,5260.335 19891989Synnott (Voyager 2)Inner moon[13][14]
Galatea
NeptuneVI (6)88±461,9530.429 19891989Synnott (Voyager 2)Inner moon[13][14]
Larissa
NeptuneVII (7)97±373,5480.555 1981/19891981/1989Reitsema, Hubbard, Lebofsky, Tholen (Voyager 2)Inner moon[13][14]
Proteus
NeptuneVIII (8)210±7117,6471.122 19891989Synnott (Voyager 2)Inner moon[13][14]
Halimede
NeptuneIX (9)31 15,728,0001,879.71 (r) 20022003Holman, Kavelaars, Grav, Fraser, MilisavljevicRetrograde irregular[13][14]
Psamathe
NeptuneX (10)20 46,695,0009,115.91 (r) 20032003Jewitt, Kleyna, Sheppard, Holman, KavelaarsRetrograde irregular[13][14]
Sao
NeptuneXI (11)22 22,422,0002,914.07 20022003Holman, Kavelaars, Grav, Fraser, MilisavljevicPrograde irregular[13][14]
Laomedeia
NeptuneXII (12)21 23,571,0003,167.85 20022003Holman, Kavelaars, Grav, Fraser, MilisavljevicPrograde irregular[13][14]
Neso
NeptuneXIII (13)30 48,387,0009,740.73 (r) 20022003Holman, Kavelaars, Grav, Fraser, MilisavljevicRetrograde irregular[13][14]
Hippocamp NeptuneXIV (14)17.4105,2830.9362 2004/20132013Showalter et al.Inner moon[142]
Vanth OrcusI (1)221±59,000±99.539 20052007Brown & SuerSynchronous rotation (Binary)[143]
S/2005 (208996) 1
(208996) 2003 AZ84—72±127,200±300≈12 20052007Brown & Suerunrecovered natural satellite[144]
Charon PlutoI (1)606±0.519,5916.387 19781978ChristySynchronous rotation (Binary)[13][14]
Nix PlutoII (2)22.548,67124.85 20052005Weaver, Stern, Buie, et al.Chaotic rotation[13][14]
Hydra PlutoIII (3)27.564,69838.20 20052005Weaver, Stern, Buie, et al.Chaotic rotation[13][14]
Kerberos PlutoIV (4)757,72932.17 20112011Showalter (Hubble)Chaotic rotation[13][14][145][146]
Styx PlutoV (5)5.542,39320.16 20122012Showalter (Hubble)Chaotic rotation[13][14][147]
Actaea SalaciaI (1)142±55,724±275.494 20062006Noll et al.Binary system[143]
Hiʻiaka HaumeaI (1)≈160 49,88049.12 20052005Brown et al.assuming a chaotic rotation[8][148][149]
Namaka HaumeaII (2)≈8525,65718.2783 20052005Brown et al.assuming a chaotic rotation[8][148][149]
Weywot QuaoarI (1)40.5±5.5[150]14,500±80012.438 20062007BrownBinary system[150][151]
S/2015 (136472) 1 Makemake—≈87.5 >21,000>12.4 20152016Parker et al.[152][153]
Ilmarë VardaI (1)163±18[154]4,809±395.751 20092011Noll et al.Binary system[155]
S/2018 (532037) 1
(532037) 2013 FY27—≈95[156]>9,800 ± 40≈1920182018Sheppardlikely a prograde orbit[157]
Xiangliu GonggongI (1)<100[158]24,020±20025.221 20102016Marton, Kiss & Müllerassuming a prograde orbit[158]
Dysnomia
ErisI (1)350±60[7]37,273±6415.786 20052005Brown, Rabinowitz, Trujillo et al.Synchronous rotation (Binary)[159]

See also

References

  1. ↑ Ice in the Solar System – NASA
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