Callisto
Moon
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Callisto, or Jupiter IV, is the second-largest moon of Jupiter, after Ganymede. In the Solar System it is the third-largest moon after Ganymede and Saturn's largest moon Titan, and as large as the smallest planet Mercury, though only about a third... Wikipedia
Orbital period: 17 days
Gravity: 1.236 m/s²
Radius: 1,497.7 mi
Discovered: January 7, 1610
Surface area: 7.30×107 km2 (0.143 Earths)
Discoverers: Galileo Galilei and Simon Marius
Age: 4.503 billion years
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