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Solar System Exploration
Dione: Facts & Figures
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Discovered By
G.D. Cassini
Date of Discovery
Orbit Size Around Saturn (semi-major axis)
Metric: 377,415 km
English: 234,515 miles
Periapsis (closest)
Metric: 376,585 km
Apoapsis (farthest)
Metric: 378,245 km
Sidereal Orbit Period (Length of Year)
0.007493498 Earth years
2.737 Earth days
Orbit Circumference
Metric: 2,371,365.51 km
Average Orbit Velocity
Metric: 36,100.4 km/h
Orbit Eccentricity
Orbit Inclination
0.028 degree
Mean Radius
Metric: 561.7 km
Equatorial Circumference
Metric: 3,529.3 km
Metric: 742,338,322 km3
Metric: 1,095,745,430,185,280,000,000 kg
Scientific Notation: 1.0957 x 1021 kg
Metric: 1.476 g/cm3
Surface Area
Metric: 3,964,776.51 km2
Surface Gravity
Metric: 0.232 m/s2
Escape Velocity
Metric: 0.510228649 km/h
Rotation Period (Length of Day)
By Comparison: Synchronous with orbital period
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Last Updated: 12 Aug 2013