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Iocaste ( ; Greek: ''Ιοκάστη''), 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 in 2000, and given the temporary designation .〔(IAUC 7555: ''Satellites of Jupiter'' ) January 5, 2001 (discovery)〕〔(MPEC 2001-A28: ''S/2000 J 2, S/2000 J 3, S/2000 J 4, S/2000 J 5, S/2000 J 6'' ) January 5, 2001 (discovery and ephemeris)〕 Iocaste orbits Jupiter at an average distance of 20,723 Mm in 609.427 days, at an inclination of 147° to the ecliptic (146° to Jupiter's equator) with an eccentricity of 0.2874. It was named in October 2002 after Jocasta,〔(IAUC 7998: ''Satellites of Jupiter'' ) 2002 October 22 (naming the moon)〕 the mother/wife of Oedipus in Greek mythology. Iocaste belongs to the Ananke group, believed to be the remnants of a break-up of a captured heliocentric asteroid.〔Sheppard, S. S.; Jewitt, D. C.; (''An Abundant Population of Small Irregular Satellites Around Jupiter'' ), Nature, Vol. 423 (May 2003), pp. 261–263〕〔Nesvorný, D.; Alvarellos, J. L. A.; Dones, L.; and Levison, H. F.; (''Orbital and Collisional Evolution of the Irregular Satellites'' ), The Astronomical Journal, Vol. 126 (2003), pp. 398–429〕 The satellite is about 5 kilometres in diameter〔Sheppard, S. S.; Jewitt, D. C.; Porco, C. C.; (''Jupiter's Outer Satellites and Trojans'' ), in ''Jupiter: The Planet, Satellites and Magnetosphere,'' edited by Fran Bagenal, Timothy E. Dowling, and William B. McKinnon, Cambridge Planetary Science, Vol. 1, Cambridge, UK: Cambridge University Press, ISBN 0-521-81808-7, 2004, pp. 263–280〕 and appears grey (colour indices B−V=0.63, R−V=0.36), similar to C-type asteroids.〔Grav, T.; Holman, M. J.; Gladman, B. J.; and Aksnes, K.; (''Photometric survey of the irregular satellites'' ), Icarus, Vol. 166 (2003), pp. 33–45〕 ==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「Iocaste (moon)」の詳細全文を読む スポンサード リンク
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