How Many Moons Does Each Planet Have?
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Our data has improved considerably in the last 20 years.
Mercury: no moons
Venus: no moons
Earth: 1 moon
Mars: 2 moons, Phobos, Deimos
Jupiter: 67 moons, some of which do not yet have proper names. The most famous are the Galilean moons, Io, Europa, Ganymede and Callisto.
Saturn: 62 moons, some of which do not yet have proper names. The most famous, by far, is Titan, which is significantly more massive than any other Saturnian moon.
Uranus: 27 moons, all of which are named after characters in the works of Shakespeare and Alexander Pope. Five are well known; Titania, Oberon, Miranda, Ariel, Umbriel
Neptune: 14 moons, the most massive by far being Triton.
While Pluto, Eris, Haumea, Orcus and Quaoar are considered dwarf planets, they nevertheless have moons.
Pluto: 5 moons, Charon, Nix, Hydra, Kerberos, Styx
Eris: 1 moon, Dysnomia
Haumea: 2 moons, Hi'iaka, Namaka
Orcus: 1 moon, Vanth
Quaoar: 1 moon, Weywot
All planets except Mercury and Venus have at least one moon. Saturn has the greatest number of moons—18. In 1995, the Hubble Space Telescope detected what appeared to be four additional moons of Saturn; however, that discovery has yet to be confirmed.
|Planet||Number of Moons||Names of Moons|
|Earth||1||The Moon (sometimes called Luna)|
|*Several other satellites have been reported but not confirmed.|
|Jupiter||16*||Metis, Adrastea, Amalthea, Thebe, Io, Europa, Ganymede, Callisto, Leda, Himalia, Lysithia, Elara, Ananke, Carme, Pasiphae, Sinope|
|Saturn||18*||Atlas, 1981S13 (unnamed as yet), Prometheus, Pandora, Epimetheus, Janus, Mimas, Enceladus, Ththys, Telesto, Calypso, Dione, Helene, Rhea, Titan, Hyperion, Iapetus, Phoebe|
|Uranus||15||Cordelia, Ophelia, Bianca, Cressida, Desdemona, Juliet, Portia, Rosalind, Belinda, Puck, Miranda, Ariel, Umbriel, Titania, Oberon|
|Neptune||8||Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, Triton, Nereid|
Sources: Famighetti, Robert, ed. World Almanac and Book of Facts 1996, pp. 279-80; The Universal Almanac 1992, pp. 17-22.
mercury and venus - 0
earth and pluto - 1
mars - 2
neptune - 8
uranus - 15
saturn - 16
jupiter - 18
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