Moon
Mimas
TypeMoon
Mass3.75 × 10¹⁹ kg
Diameter396 km
Orbital Radius185,500 km
Orbital Period0.942 days
Rotation Period22.6 hours
Known Moons0
Surface Gravity0.064 m/s²
Average Temp-200 °C
AtmosphereNone (exosphere)
Discovered ByWilliam Herschel
Discovery Year1789
About Mimas
Death Star lookalike with the 139 km Herschel crater spanning a third of its diameter. The impact nearly shattered the moon. A wobble in its rotation detected by Cassini revealed a young internal ocean beneath the ice, announced in 2024. The smallest body known to be rounded by its own gravity.
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