Ganymede

Ganymede (Jupiter III) is a moon of Jupiter, discovered by Galileo Galilei in 1610. It orbits Jupiter every 7.2 days and shines at about magnitude 4.6.

The largest moon in the Solar System, bigger than Mercury; its shadow on Jupiter is the easiest to see.

Other moons of Jupiter: Io, Europa, Callisto.

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