Callisto is the last of the four Galilean moons and unlike io, it's inactive and has a very old surface. The surface is mainly ice and has the highest impacted surface in our solar system.
Orbital period: 16.69 earth days
Orbital Speed: 8.20 km/s
Inclination: 0.19°
Mean Radius: 2,631.2 km
Circumference: 15,144.4 km
Mass: 1.0759 x 1023 kg
Surface Gravity: 1.24 m/s2
Apparent Magnitude: 5.65
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