Moon of Jupiter, one of the
Galeleian Moons.
Third largest moon in the solar system. The most heavily cratered object in the solar system, which is a title of dubious pride, I guess. The Valhalla crater is 3,000 km in diameter, which is a lot considering that the diameter of Callisto is 4,800 km.
Discovery: Jan 7, 1610 by Galileo Galilei
Diameter (km): 4,806
Mass (kg): 1.077e23
Mass (Earth = 1) 1,807e-2
Surface Gravity (Earth = 1): 0.127
Mean Distance from Jupiter (km): 1,883,000
Mean Distance From Jupiter (Rj): 26,6
Mean Distance from Sun (AU): 5.203
Orbital period (days): 16.68902
Rotational period (days): 16.68902
Density (gm/cm3) 1.86
Orbit Eccentricity: 0.007
Orbit Inclination (degrees): 0.281
Orbit Speed (km/sec): 8.21
Escape velocity (km/sec): 2.74
Visual Albedo: ?
Subsolar Temperature (K): ?
Equatorial Subsurface Temperature (K): ?
Surface Composition: Dirty Ice
Data from NASA