Callisto

Callisto (Jupiter IV) is a moon of Jupiter, discovered by Galileo Galilei in 1610. It orbits Jupiter every 16.7 days and shines at about magnitude 5.6.

Ancient, dark and cratered; it strays farthest from Jupiter, up to about 10′ away.

Other moons of Jupiter: Io, Europa, Ganymede.

Open AstroPilot to see where Callisto is next to Jupiter tonight and how easy it is with your telescope.