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Cassini view of Rhea's anti-Saturnian hemisphere, showing the moon's two largest impact basins (Mamaldi above and left of center, and adjacent Tirawa to its upper right). At highest resolution, several long linear features are visible: halfway down from center is Harahvaiti Fossa, while near the limb left of the bottom is Koykamou Catena.
|Discovered by||G. D. Cassini|
|Discovery date||December 23, 1672|
|Alternative names||Saturn V|
|Orbital characteristics |
|Semi-major axis||527 108 km|
|Eccentricity||0.001 258 3|
|Orbital period||4.518 212 d|
|Inclination||0.345° (to Saturn's equator)|
|Mean radius||763.8 ± 1.0 km|
|Surface area||7 337 000 km²|
|Mass||(2.306 518 ± 0.000 353)×1021 kg (~3.9×10−4 Earths)|
|Mean density||1.236 ± 0.005 g/cm³|
|Equatorial surface gravity||0.265 m/s²|
|Escape velocity||0.635 km/s|
|Rotation period||4.518 212 d
Ring system [change]
Rhea may have a thin ring system with three narrow bands in a disk of solid particles. These would be the first rings seen around a moon. The discovery was announced in the journal Science on March 6, 2008.
- In US dictionary transcription, US dict: rē′·ə.
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