Ganymede is another of Jupiter's moons, one of the Galilean moons. It's composed of mostly silicate rock and icy water and is actually larger than mercury.
Orbital period: 7.15 earth days
Orbital Speed: 10.88 km/s
Inclination: 0.2°
Mean Radius: 2,631.2 km
Circumference: 16,532.3 km
Mass: 1.4819 × 1023 kg
Surface Gravity: 1.43 m/s2
Apparent Magnitude: 4.61
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