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Solar
Moon

Dione

Orbital elements

Semi-major axis
0.003 AU
Eccentricity
0.0022
Orbital period
2.7 days
Epoch · J2000
J2000

Physical properties

Mean radius
561 km
Mass
1.095 × 10²¹ kg
Density
1.478 g/cm³

Visual & observation

Geometric albedo
0.998

Discovery & classification

Discovered by
Giovanni Cassini
Discovery date
21 March 1684

Sources