| Proper Name | Tethys | | Designation | Saturn III | | Primary Planet | Saturn | | Family / Class | Major moons (shares an orbit with Telesto and Calypso) | | Orbital Period | 1 days, 21 hours, 18 minutes | | Distance from Saturn | Semi-Major Axis: 294,619 km
Periapsis: 294,590, km
Apoapsis: 294,648 km | | Eccentricity | 0.0001 | | Rotation Period | 1 days, 21 hours, 18 minutes (synchronous orbit) | | Mean Diameter | 1,062.2 km
660.0 miles | | Notes | The fifth largest of Saturn's many moons, Tethys is composed largely from water ice, and is one of the most reflective bodies in the Solar System. It shares its orbital path with two much smaller moons, Telesto and Calypso. |
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