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Solar System Exploration
Ganymede: Facts & Figures
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Discovered By
Galileo Galilei
Date of Discovery
Orbit Size Around Jupiter (semi-major axis)
Metric: 1,070,400 km
Periapsis (closest)
Metric: 1,069,008 km
Apoapsis (farthest)
Metric: 1,071,792 km
Sidereal Orbit Period (Length of Year)
0.019589322 Earth years
7.15455296 Earth days
Orbit Circumference
Metric: 6,725,518.71 km
Average Orbit Velocity
Metric: 39,165.6 km/h
Orbit Eccentricity
Orbit Inclination
0.177 degree
Mean Radius
Metric: 2,631.2 km
Equatorial Circumference
Metric: 16,532.3 km
Metric: 76,304,506,998 km3
Metric: 148,185,846,875,052,000,000,000 kg
Scientific Notation: 1.4819 x 1023 kg
Metric: 1.942 g/cm3
Surface Area
Metric: 86,999,665.93 km2
Surface Gravity
Metric: 1.428 m/s2
Escape Velocity
Metric: 9,869 km/h
English: 6,133 mph
Scientific Notation: 2742 m/s
Sidereal Rotation Period (Length of Day)
7.155 Earth days
By Comparison: Synchronous with orbital period
Atmospheric Constituents
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Last Updated: 12 Aug 2013