| Proper Name | Ganymede | | Designation | Jupiter III | | Primary Planet | Jupiter | | Family / Class | Galilean moons | | Orbital Period | 7 days, 4 hours | | Distance from Jupiter | Semi-Major Axis: 1,070,000 km
Periapsis: 1,069,000 km
Apoapsis: 1,072,000 km
| | Eccentricity | 0.0013 | | Rotation Period | 7 days, 4 hours (synchronous) | | Mean Diameter | 5,262 km
3,270 miles |
The immense moon Ganymede orbits its parent planet Jupiter among the four Galilean Moons. It is the largest moon in the Solar System, but more than that, its diameter is actually greater than that of the planet Mercury. Its surface is covered in warped ridges and grooves, showing a history of intense tectonic activity, and speckled with impact craters.
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