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Calypso, in astronomy, one of the 18 named moons, or natural satellites, of Saturn. Also known as Saturn XIV (or S14), Calypso is a small, irregularly shaped (nonspherical) body measuring about 21 mi (34 km) by 13.5 mi (22 km) by 13.5 mi (22 km); it orbits Saturn at a mean distance of 183,093 mi (294,660 km), and has an orbital period of 1.8878 earth days : the rotational period is unknown but is assumed to be the same as the orbital period. Calypso was discovered in 1980 by a group led by a team at the Univ. of Arizona led by Bradford A. Smith from ground-based photographs taken with prototype cameras designed for the Hubble Space Telescope. Calypso is co-orbital with two other moons, Telesto and Tethys; that is, they orbit Saturn at the same distance. Calypso and Telesto are two of the smallest moons in the solar system.
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