Moon
Phoebe
TypeMoon
Mass8.29 × 10¹⁸ kg
Diameter213 km
Orbital Radius12.9 million km
Orbital Period550.3 days
Rotation Period9.27 hours
Known Moons0
Surface Gravity0.039 m/s²
Average Temp-183 °C
AtmosphereNone
Discovered ByWilliam Pickering
Discovery Year1899
About Phoebe
The largest irregular moon of Saturn, orbiting backwards like a captured object. Cassini mapped it in 2004 before entering orbit, finding a layered interior of rock and ice. Likely a Centaur seized from the outer solar system. Its dust darkens the face of Iapetus.
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