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Semimajor Axis of Orbit 1,883,000 km
Siderial Revolution Period 16d 16h 32m
Orbit Eccentricity 0.007
Orbital Inclination 0.5
Radius 2400 km
Visual Magnitude 5.6

Callisto, the outermost of the Galilean satellites, is the most heavilly cratered object in the solar system. Its surface is made up entirely of ice, and its core of rock. The reason that Callisto is so heavilly cratered is that the satellite is geologically dead, with no way to renew the surface after impact craters. It is a very large satellite, 2,400 km in radius, only a little smaller than Ganymede.