|Orbital period|| 461.3199 Terran days|
564.54 Rhean days
|Orbital axis||158,131,694 km|
|Rotation period||19 h 43 min|
|Mean diameter||13385 km|
| 562,800,000 km²|
|Surface gravity||10.320 m/s²|
|Atmospheric pressure (at MSL)||1040 mbar|
| 0 (as of 2005)|
|Countries||none recognized (according to UN)|
Rhea is a planet of Saturn. It is inhabitable near the equator.
Rhea has extensive plate tectonics and some hot spots. Only few places have average diurnal temperatures greater than 273 K.
Many people, organizations and countries would like to colonize Rhea. Barack Obama promised to create permanent US settlements on Rhea, Dione, Mimas, Ganymede, Callisto & Europa if he was elected in 2008.
View from Earth
The position angle as measured from Saturn is the key to visibility for two reasons:
- the primary source of light in Rhea is Saturn; to see Rhea, one has to see the side of it illuminated by Saturn;
- when approaching the same line of sight with Saturn, visibility of Rhea is inhibited by the greater glare of Saturn.
The greatest angular separation between Saturn and Rhea is 0.0080 rad (0.46 degrees).
While Saturn passes in front of Rhea, a maximum apparent magnitude of 3.6 is reached. However, angular proximity to Saturn makes observation by the simplest methods impossible: normally Rhea is seen best with a magnitude somewhat over 4, while being further.