Moon of Saturn
Diameter: 415.6 km
Distance: 185520 km (mean)
Period: 0.942 days
Eccentricity: 0.021
Inclination: 1.57°
Magnitude: 12.8

Discovered by W. Herschel in 1789, Mimas is a moon of Saturn composed mostly of water ice with only a small amount of rock. Mimas is only 416 x 393 x 381 km large, but has a 130 km wide impact crater (named Herschel) with 5km high walls, up to 10km deep and with a central peak of 6km.