Callisto
Jupiter's heavily cratered outer Galilean moon.
Callisto is the second-largest moon of Jupiter and the third-largest in the Solar System, nearly as big as Mercury but with only about a third of its mass. It orbits Jupiter at about 1.88 million km and is the outermost Galilean moon.
Its surface is the oldest and most heavily cratered in the Solar System, with no sign of plate tectonics or volcanism.
Quick Facts
- Pronounced
- k
- ə
- ˈ
- l
- ɪ
- s
- t
- oʊ (kə, LIST, oh)
- Named after
- Καλλιστώ Kallistō
- Discoverer
- Galileo Galilei; Simon Marius
- Discovered
- 7 January 1610
- Periapsis
- 1.869 million km
- Apoapsis
- 1.897 million km
- Inclination
- 2.017° (to the ecliptic); 0.192° (to local Laplace planes)
- Satellite of
- Jupiter
More in Celestial Bodies & Worlds
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