Tethys

Tethys or Saturn III is a mid-sized moon of Saturn about 1,060 km (660 mi) across. It is named after the titan Tethys of Greek mythology.

Tethys has a low density of 0.98 g/cm³, indicating that it is made of water ice with just a small fraction of rock. Tethys’ calculated surface gravity is 0.147 m/s2(0.015g).

The surface of Tethys is very bright, being second brightest among the moons of Saturn after Enceladus, and neutral in color. Tethys is heavily cratered and cut by a number of large scale faults.