Moon
Rhea
TypeMoon
Mass2.306 × 10²¹ kg
Diameter1,527 km
Orbital Radius527,000 km
Orbital Period4.518 days
Rotation Period108.4 hours
Known Moons0
Surface Gravity0.264 m/s²
Average Temp-174 °C
AtmosphereO2, CO2 (extremely thin)
Discovered ByWilliam Herschel
Discovery Year1786
About Rhea
The second largest moon of Saturn, an icy body with wispy bright fractures on its trailing side. Cassini detected an extremely thin oxygen exosphere in 2010. Magnetometer data in 2008 hinted at a possible ring, never confirmed. Interior may hide a layered core of rock and ice.
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