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Helene (moon)
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Helene ( ; (ギリシア語:Ἑλένη)) is a moon of Saturn. It was discovered by Pierre Laques and Jean Lecacheux in 1980 from ground-based observations at Pic du Midi Observatory, and was designated . In 1988 it was officially named after Helen of Troy, who was the granddaughter of Cronus (Saturn) in Greek mythology. Helene is also designated (12), which it was given in 1982, and Dione B, because it is co-orbital with Dione and located in its leading Lagrangian point (). It is one of four known trojan moons.
== Exploration ==
Helene was initially observed from Earth in 1980, and ''Voyager'' flybys of Saturn in the early 1980s allowed much closer views. The ''Cassini–Huygens'' mission, which went into orbit around Saturn in 2004, provided still better views, and allowed more in-depth analysis of Helene, including views of the surface under different lighting conditions. Some of the closest images of Helene to date are from the ''Cassini'' spacecraft's 1800 km flyby on March 3, 2010, and another very successful imaging sequence occurred in June 2011. There have been many other approaches over the course of the ''Cassini'' mission, and future flybys may yield additional data.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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