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Callisto
Callisto-moon
Description
Satellite of Jupiter
Orbital period 17 days
Diameter: 4,821 km
Radius: 2,410 km
Discovered January 7, 1610
Discoverer(s) Galileo Galilei

Callisto is the second-largest moon of Jupiter, after Ganymede. It is the third-largest moon in the Solar System after Ganymede and Saturn's largest moon Titan, and the largest object in the Solar System not to be properly differentiated.