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Epimetheus(ĕp'əmē`thēəs), in Greek mythology: see PandoraPandora
, in Greek mythology, first woman on earth. Zeus ordered Hephaestus to create her as vengeance upon man and his benefactor, Prometheus. The gods endowed her with every charm, together with curiosity and deceit.
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Epimetheus,in astronomy, one of the named moons, or natural satellites, of SaturnSaturn,
in astronomy, 6th planet from the sun. Astronomical and Physical Characteristics of Saturn
Saturn's orbit lies between those of Jupiter and Uranus; its mean distance from the sun is c.886 million mi (1.
..... Click the link for more information. . Also known as Saturn XI (or S11), Epimetheus is an irregularly shaped (nonspherical) body measuring about 89 mi (144 km) by 67 mi (108 km) by 61 mi (98 km); it orbits Saturn at a mean distance of 94,090 mi (151,422 km) and has equal orbital and rotational periods of 0.6942 earth days. It was discovered by R. Walker, Stephen M. Larson, and John W. Fountain in 1978 and confirmed in 1980 by Dale P. Cruikshank at the Univ. of Hawaii at Manoa from Voyager 1 photographs. Its surface is cratered, with several craters more than 18 mi (30 km) in diameter, and marked with both large and small ridges, valleys, and grooves as well. Epimetheus and JanusJanus
, in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn X (or S10), Janus is an irregularly shaped (nonspherical) body measuring about 122 mi (196 km) by 119 mi (192 km) by 93 mi (150 km); it orbits Saturn at a mean distance of 94,120
..... Click the link for more information. are co-orbital; that is, they share the same average orbit. About every fourth year—at closest approach—the lower, faster satellite overtakes the other, they exchange angular momentum, and the lower one is boosted into the higher orbit while the higher one drops to the lower orbit. The two moons may have formed from the disruption of a single satellite early in the formation of Saturn's satellite system.
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Epimetheus(ep-ă-mee -th'ee-ŭs, -thooss) A small irregularly shaped satellite of Saturn. It is a coorbital satellite with Janus; they orbit between the F ring and G ring. There are two named craters on Epimetheus, Hilairea and Pollux. See Saturn's rings; Table 2, backmatter.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
A satellite of Saturn which orbits at a mean distance of 151,000 kilometers (94,000 miles), near Saturn's rings, in nearly the same orbit as Janus, and has an irregular shape with an average diameter of 120 kilometers (75 miles).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.