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Orbit: 527,040 km from Saturn
Orbital period: 108 hours
Gravity: 0.264 m/s²
Circumference: 4,802 km
Diameter: 1530 km
Mass: 2.49e21 kg

Rhea is the second-largest moon of Saturn and the ninth largest moon in the Solar System. It was discovered in 1672 by Giovanni Domenico Cassini.

Though somewhat larger, Rhea is otherwise very similar to   Dione. They both have similar compositions,   albedo  features   and varied terrain. Both       rotate synchronously  and have dissimilar leading       and trailing hemispheres.

Rhea is composed primarily of water ice with rock making up less than 1/3 of   its mass.

The leading hemisphere is heavily cratered  and  uniformly bright (left). Like Callisto, the  craters       lack the high relief features seen on the Moon and Mercury.

On the  trailing hemisphere there is a network       of bright swaths on a dark  background and few visible craters       (right).

Rhea’s history is probably very similar to Dione’s.


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