Moon of Saturn
Diameter: 1060 km
Distance: 294660 km (mean)
Period: 1.888 days
Eccentricity: 0.0001
Inclination: 1.12°
Magnitude: 10.2

Discovered in 1684, Tethys' density is 0.97 times that of liquid water, which suggests that Tethys is composed almost entirely of water ice plus a small amount of rock. Tethys has two prominent features, a giant impact crater (240 km wide Odysseus) and a great valley, Ithaca Chasma, running roughly from the north pole to the south pole, 100km wide.