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Tethys (moon)

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Photo taken by Cassini-Huygens.

Tethys (pronounced TEE-this)[1][2] is a large moon of the planet Saturn.


It was discovered by Giovanni Domenico Cassini in 1684.[1][2] It was one of the first Saturnian moons discovered.

Physical characteristics

Mass, density and volume

Tethys' mass is 617,551,805,221,061,000,000 kg, its density is 0.973 g/cm3 and its volume is 634,264,255 km3.[3]

Craters and valleys

It has a very large crater on its surface, called Odysseus.[1] It is named after a Greek warrior king in Homer's two great works, The Iliad and The Odyssey.[1] There is also a very long valley called Ithaca Chasma. It is 100 km wide and 2000 km long.[1][2]

Orbit and rotation

Tethys takes 45.3 hours to orbit (go around) Saturn[2] and orbits Saturn 294,660 km away.[2] Tethys is tidally locked in phase with its parent planet - one side always faces toward Saturn.[1]