| Proper Name | Callisto | | Designation | Jupiter IV | | Primary Planet | Jupiter | | Orbital Period | 16 days, 17 hours | | Distance from Jupiter | Semi-Major Axis: 1,882,700 km
Periapsis: 1,869,500 km
Apoapsis: 1,895,900 km | | Eccentricity | 0.0074 | | Rotation Period | 16 days, 17 hours (synchronous) | | Mean Diameter | 4,821 km
2,996 miles |
The outermost of the four Galilean moons of Jupiter circles its parent planet at a distance of a little under two million kilometres, making it nearly twice as distant from Jupiter as any of its three bright companion moons, Ganymede, Europa and Io. It has a dark surface speckled with bright craters, often surrounded by rings of material. Its largest surface feature is a wide circular region about six hundred kilometres in diameter, Valhalla, which is surrounded by circular patterns that extend outward across Callisto's surface.
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