Ganymede - Ganymede (moon) Ganymede Image of Ganymede's...

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Ganymede (moon) Ganymede Image of Ganymede's anti-Jovian hemisphere taken by the Galileo probe. Lighter surfaces, such as in recent impacts, grooved terrain and the whitish north polar cap at upper right, are enriched in water ice. Discovery Discovered by Galileo Galilei Discovery date January 7, 1610 [1] [2] [3] Designations Alternate name(s) Jupiter III Adjective Ganymedian, Ganymedean Orbital characteristics Periapsis 1,069,200 km [b] Apoapsis 1,071,600 km [a] Semi-major axis 1,070,400 km [4] Eccentricity 0.0013 [4] Orbital period 7.15455296 d [4] Average orbital speed 10.880 km/s Inclination 0.20° (to Jupiter's equator) [4] Satellite of Jupiter Physical characteristics Mean radius 2634.1 ± 0.3 km (0.413 Earths) [5] Surface area 87.0 million km 2 (0.171
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Earths) [c] Volume 7.6 × 10 10 km 3 (0.0704 Earths) [d] Mass 1.4819 × 10 23 kg (0.025 Earths) [5] Mean density 1.936 g /cm 3 [5] Equatorial surface gravity 1.428 m/s 2 (0.146 g ) [e] Escape velocity 2.741 km/s [f] Rotation period
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Ganymede - Ganymede (moon) Ganymede Image of Ganymede's...

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