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Thyone ( ; Greek: ''Θυώνη''), also known as , is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard, et al. in 2001, and given the temporary designation .〔(IAUC 7900: ''Satellites of Jupiter'' ) 2002 May 16 (discovery)〕〔(MPEC 2002-J54: ''Eleven New Satellites of Jupiter'' ) 2002 May (discovery and ephemeris)〕 Thyone is about 4 kilometres in diameter, and orbits Jupiter at an average distance of 21.406 million kilometres in 639.803 days, at an inclination of 147° to the ecliptic (147° to Jupiter's equator) with an eccentricity of 0.2526. Its average orbital speed is 2.43 km/s. It was named in August 2003 after Thyone, better known as Semele, mother of Dionysus in Greek mythology.〔(IAUC 8177: ''Satellites of Jupiter, Saturn, Uranus'' ) 2003 August (naming the moon)〕 Thyone belongs to the Ananke group, retrograde irregular moons which orbit Jupiter between 19.3 and 22.7 million kilometres, at inclinations of roughly 150°. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Thyone (moon)」の詳細全文を読む スポンサード リンク
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