Space

Moons — The Major Moons of the Solar System

The major moons of the solar system in one sortable table — the top 25 by size for Jupiter, Saturn, and Uranus; every confirmed Neptunian moon; both Martian moons; Earth's Moon; and Pluto's Charon. Each row links to a per-moon page covering surface conditions, discovery, mission history, and the Greek / Roman / Shakespearean / Inuit / Norse naming conventions.

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All major moons

Name	Parent	Diameter (km)	Orbital radius (km)	Period (d)	Discovered	Discoverer
Luna	Earth	3475	384,400	27.32	prehistoric	Known to all of humanity
Phobos	Mars	22.4	9,376	0.319	1877	Asaph Hall
Deimos	Mars	12.4	23,463	1.263	1877	Asaph Hall
Metis	Jupiter	43	128,000	0.295	1979	Stephen P. Synnott (Voyager 2)
Adrastea	Jupiter	16	129,000	0.298	1979	David C. Jewitt (Voyager 2)
Amalthea	Jupiter	167	181,400	0.498	1892	Edward Emerson Barnard
Thebe	Jupiter	98	221,900	0.675	1979	Stephen P. Synnott (Voyager 1)
Io	Jupiter	3643	421,800	1.769	1610	Galileo Galilei
Europa	Jupiter	3122	671,100	3.551	1610	Galileo Galilei
Ganymede	Jupiter	5268	1,070,400	7.155	1610	Galileo Galilei
Callisto	Jupiter	4821	1,882,700	16.689	1610	Galileo Galilei
Themisto	Jupiter	8	7,507,000	130	1975, 2000	Charles Kowal & Elizabeth Roemer (1975); rediscovered 2000
Leda	Jupiter	22	11,165,000	240.9	1974	Charles T. Kowal
Himalia	Jupiter	139	11,460,000	250.6	1904	Charles Dillon Perrine
Lysithea	Jupiter	36	11,717,000	259.2	1938	Seth Barnes Nicholson
Elara	Jupiter	79	11,740,000	259.6	1905	Charles Dillon Perrine
Harpalyke	Jupiter	4	21,105,000	624.5	2000	Scott S. Sheppard et al.
Praxidike	Jupiter	7	21,148,000	625.3	2000	Scott S. Sheppard et al.
Iocaste	Jupiter	5	21,269,000	631.5	2000	Scott S. Sheppard et al.
Ananke	Jupiter	28	21,276,000	629.8	1951	Seth Barnes Nicholson
Erinome	Jupiter	3.2	23,196,000	724.4	2000	Scott S. Sheppard et al.
Taygete	Jupiter	5	23,360,000	732.4	2000	Scott S. Sheppard et al.
Carme	Jupiter	47	23,404,000	734.2	1938	Seth Barnes Nicholson
Kalyke	Jupiter	5	23,583,000	743	2000	Scott S. Sheppard et al.
Pasiphae	Jupiter	60	23,624,000	743.6	1908	Philibert Jacques Melotte
Megaclite	Jupiter	5	23,806,000	752.9	2000	Scott S. Sheppard et al.
Sinope	Jupiter	38	23,939,000	758.9	1914	Seth Barnes Nicholson
Callirrhoe	Jupiter	9	24,102,000	758.8	1999	James Scotti et al.
Pan	Saturn	28	133,584	0.575	1990	Mark R. Showalter (Voyager 2 images)
Daphnis	Saturn	8	136,504	0.594	2005	Cassini Imaging Science Team
Atlas	Saturn	30	137,670	0.602	1980	Richard Terrile (Voyager 1)
Prometheus	Saturn	86	139,380	0.613	1980	Stewart A. Collins (Voyager 1)
Pandora	Saturn	81	141,720	0.629	1980	Stewart A. Collins (Voyager 1)
Epimetheus	Saturn	116	151,410	0.694	1980	John Fountain & Stephen Larson
Janus	Saturn	179	151,460	0.695	1966	Audouin Dollfus
Mimas	Saturn	396	185,540	0.942	1789	William Herschel
Enceladus	Saturn	504	238,040	1.37	1789	William Herschel
Tethys	Saturn	1062	294,670	1.888	1684	Giovanni Domenico Cassini
Telesto	Saturn	24	294,710	1.888	1980	Bradford A. Smith et al.
Calypso	Saturn	21	294,710	1.888	1980	Daniel J. Pascu, P. Kenneth Seidelmann et al.
Dione	Saturn	1123	377,420	2.737	1684	Giovanni Domenico Cassini
Helene	Saturn	36	377,420	2.737	1980	Pierre Laques & Jean Lecacheux
Rhea	Saturn	1527	527,070	4.518	1672	Giovanni Domenico Cassini
Titan	Saturn	5150	1,221,870	15.95	1655	Christiaan Huygens
Hyperion	Saturn	270	1,481,000	21.28	1848	William Cranch Bond, George Phillips Bond, William Lassell
Iapetus	Saturn	1469	3,560,820	79.32	1671	Giovanni Domenico Cassini
Kiviuq	Saturn	16	11,365,000	449.2	2000	Brett J. Gladman et al.
Phoebe	Saturn	213	12,952,000	550.6	1899	William Henry Pickering
Paaliaq	Saturn	22	15,200,000	686.9	2000	Brett J. Gladman et al.
Albiorix	Saturn	32	16,182,000	783.5	2000	Matthew J. Holman
Tarvos	Saturn	15	17,983,000	944.2	2000	John J. Kavelaars et al.
Siarnaq	Saturn	40	18,016,000	895.5	2000	Brett J. Gladman et al.
Ymir	Saturn	18	23,040,000	1315.4	2000	Brett J. Gladman et al.
Cordelia	Uranus	40	49,770	0.335	1986	Richard J. Terrile (Voyager 2)
Ophelia	Uranus	43	53,760	0.376	1986	Richard J. Terrile (Voyager 2)
Bianca	Uranus	51	59,170	0.435	1986	Bradford A. Smith (Voyager 2)
Cressida	Uranus	80	61,770	0.464	1986	Stephen P. Synnott (Voyager 2)
Desdemona	Uranus	64	62,680	0.474	1986	Stephen P. Synnott (Voyager 2)
Juliet	Uranus	94	64,360	0.494	1986	Stephen P. Synnott (Voyager 2)
Portia	Uranus	135	66,100	0.513	1986	Stephen P. Synnott (Voyager 2)
Rosalind	Uranus	72	69,930	0.558	1986	Stephen P. Synnott (Voyager 2)
Belinda	Uranus	90	75,260	0.624	1986	Stephen P. Synnott (Voyager 2)
Perdita	Uranus	30	76,417	0.638	1986 (found 1999)	Erich Karkoschka (in Voyager 2 images)
Puck	Uranus	162	86,010	0.762	1985	Stephen P. Synnott (Voyager 2)
Miranda	Uranus	471	129,390	1.413	1948	Gerard P. Kuiper
Ariel	Uranus	1158	191,020	2.52	1851	William Lassell
Umbriel	Uranus	1169	266,000	4.144	1851	William Lassell
Titania	Uranus	1577	435,910	8.706	1787	William Herschel
Oberon	Uranus	1523	583,520	13.46	1787	William Herschel
Francisco	Uranus	22	4,276,000	266.6	2001	Matthew J. Holman et al.
Caliban	Uranus	72	7,231,000	579.7	1997	Brett J. Gladman et al.
Stephano	Uranus	32	8,004,000	677.5	1999	Brett J. Gladman, Matthew J. Holman et al.
Trinculo	Uranus	18	8,504,000	749.2	2001	Matthew J. Holman et al.
Sycorax	Uranus	165	12,179,000	1288.3	1997	Philip D. Nicholson, Brett J. Gladman et al.
Margaret	Uranus	20	14,345,000	1694.8	2003	Scott S. Sheppard et al.
Prospero	Uranus	50	16,276,000	1978.3	1999	Matthew J. Holman, John J. Kavelaars et al.
Setebos	Uranus	47	17,418,000	2225.2	1999	John J. Kavelaars et al.
Ferdinand	Uranus	20	20,901,000	2823.4	2001	Matthew J. Holman et al.
Naiad	Neptune	66	48,227	0.294	1989	Voyager 2 imaging team
Thalassa	Neptune	82	50,074	0.311	1989	Voyager 2 imaging team
Despina	Neptune	150	52,526	0.335	1989	Voyager 2 imaging team
Galatea	Neptune	175	61,953	0.429	1989	Voyager 2 imaging team
Larissa	Neptune	194	73,548	0.555	1989	Voyager 2 imaging team (Harold Reitsema observed 1981)
Hippocamp	Neptune	17	105,283	0.95	2013	Mark R. Showalter (Hubble Space Telescope)
Proteus	Neptune	420	117,647	1.122	1989	Voyager 2 imaging team
Triton	Neptune	2707	354,759	5.877	1846	William Lassell
Nereid	Neptune	340	5,513,400	360.13	1949	Gerard P. Kuiper
Halimede	Neptune	62	16,611,000	1879.7	2002	Matthew J. Holman et al.
Sao	Neptune	44	22,228,000	2912.7	2002	Matthew J. Holman et al.
Laomedeia	Neptune	42	23,567,000	3171.3	2002	Matthew J. Holman et al.
S/2002 N 5	Neptune	23	23,571,000	3169.6	2021	Scott S. Sheppard et al. (announced 2024)
Psamathe	Neptune	40	46,695,000	9128.7	2003	Scott S. Sheppard et al.
Neso	Neptune	60	50,258,000	9740.7	2002	Matthew J. Holman et al.
S/2021 N 1	Neptune	14	50,300,000	9750	2021	Scott S. Sheppard et al. (announced 2024)
Charon	Pluto (dwarf planet)	1212	19,591	6.387	1978	James W. Christy

Click any column header to sort. The default sort groups moons by parent planet, then by orbital radius. The roster covers the top 25 moons by size for Jupiter, Saturn, and Uranus; all 16 confirmed Neptunian moons; both Martian moons; Earth's Moon; and Pluto's Charon as the explicit dwarf-planet exception.

About the data

Diameter, mass, and orbital parameters from JPL Solar System Dynamics — Physical Parameters and JPL Satellite Discovery Circumstances. Naming from the IAU Working Group for Planetary System Nomenclature.