- Additional Information
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Additional Information
Short Description Rhea is the second-largest moon of Saturn and the ninth-largest moon in the Solar System. It is the second smallest body in the Solar System, after the asteroid and dwarf planet Ceres, for which precise measurements have confirmed a shape consistent with hydrostatic equilibrium. Rhea is named after the Titan Rhea of Greek mythology, the "mother of the gods". It is also designated Saturn V (being the fifth major moon going outward from the planet). Rhea is an icy body with a density of about 1.236 g/cm3. This low density indicates that it is made of ~25% rock (density ~3.25 g/cm3) and ~75% water ice (density ~0.93 g/cm3). Although Rhea is the ninth-largest moon, it is only the tenth-most-massive moon. On March 6, 2008, NASA announced that Rhea may have a tenuous ring system. This would mark the first discovery of rings about a moon. Rhea (moon) - Wikipedia, the free encyclopedia Discovered by Giovanni Domenico Cassini Discovery date December 23, 1672 Type Moon AddInfo Saturn V Satellite of Saturn Orbit Prograde Rotation Synchronous Satellites Has rings Atmosphere Trace Shape Equilibrium spheroid Geological activity In the past Apoapsis 06 527 570 km Periapsis 06 526 510 km Semi-major axis 06 527 108 km Distance from Sun 01 9.554 909 au /21 Eccentricity 0.001 258 3 Orbital period 4.518 212 days Orbital speed 01 8.48 km/s Inclination to the equator 000.345° Diameter/Size 04 1528.6 km Dimensions 1532.4 × 1525.6 × 1524.4 km Mass 1021×2.306 518 kg Density 01 1.236 g/cm3 Surface gravity 0.264 m/s2 Escape velocity 03 635 m/s Rotation period 4.518 212 days Axial tilt 0° Albedo geometric 0.949 Temperature min 02 53 K Temperature mean 02 73 K Temperature max 02 99 K Apparent magnitude 10 - Comments
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