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Rhea

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

Rhea in astronomy, one of the named moons, or natural satellites, of Saturn . Also known as Saturn V (or S5), Rhea is 950 mi (1530 km) in diameter, orbits Saturn at a mean distance of 327,487 mi (527,040 km), and has equal orbital and rotational periods of 4.517 earth days. The second largest of Saturn's moons, Rhea was discovered by the Italian-French astronomer Gian Domenico Cassini in 1672. Rhea's density of 1.3 means that it is composed primarily of water ice, rocky material making up about a third of its mass. Its leading hemisphere is highly reflective and heavily cratered, strongly resembling the cratered highlands of the moon, although Rhea's craters do not have high walls or a towering central peak; the trailing hemisphere is darker with bright wispy streaks and few impact craters.

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Rhea

A Dictionary of Astronomy | 1997 | Copyright

Rhea The second-largest satellite of Saturn, 1528 km in diameter; also known as Saturn V. Rhea orbits Saturn in 4.518 days at a distance of 527 100 km. Its axial rotation period is the same as its orbital period. It was discovered in 1672 by G. D.Cassini. Rhea has an icy surface saturated with impact craters, and shows broad, elongated wispy features of unknown origin on its trailing hemisphere.

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Rhea

A Dictionary of Earth Sciences | 1999 | | Copyright

Rhea (Saturn V) One of the major satellites of Saturn, with a radius of 764 km; mass 23.1 × 10²⁰ kg; mean density 1240 kg/m³; visual albedo 0.7. It was discovered in 1672 by G. D. Cassini.

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AILSA ALLABY and MICHAEL ALLABY. "Rhea." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Rhea." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O13-Rhea.html

AILSA ALLABY and MICHAEL ALLABY. "Rhea." A Dictionary of Earth Sciences. 1999. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Rhea.html

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