Moon
Dione
TypeMoon
Mass1.095 × 10²¹ kg
Diameter1,123 km
Orbital Radius377,400 km
Orbital Period2.737 days
Rotation Period65.7 hours
Known Moons0
Surface Gravity0.232 m/s²
Average Temp-186 °C
AtmosphereNone (exosphere)
Discovered ByGiovanni Cassini
Discovery Year1684
About Dione
A cratered ice moon with towering bright cliffs called chasmata on its trailing side. Gravity data suggests a residual liquid ocean deep inside. Two tiny moons, Helene and Polydeuces, share its orbit at stable points. Cassini made five targeted flybys between 2005 and 2011.
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