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Themisto (moon)
Themisto (; from Greek: ''Θεμιστώ''), also known as , is a small prograde irregular satellite of Jupiter. It was discovered in 1975, lost, and rediscovered in 2000.
== Discovery and naming ==
Themisto was first discovered by Charles T. Kowal and Elizabeth Roemer on September 30, 1975, reported on October 3, 1975,〔(IAUC 2845: ''Probable New Satellite of Jupiter'' ) 1975 October 3 (discovery)〕 and designated . However, not enough observations were made to establish an orbit and it was subsequently lost. (See also lost minor planet.)
Themisto appeared as a footnote in astronomy textbooks into the 1980s. Then, in 2000, a seemingly new satellite was discovered by Scott S. Sheppard, David C. Jewitt, Yanga R. Fernández and Eugene A. Magnier, and was designated . It was soon confirmed that this was the same as the one observed in 1975.〔(IAUC 7525: ''S/1975 J 1 = S/2000 J 1'' ) 2000 November 25 (recovery)〕 This observation was immediately correlated with an observation on 6 August 2000 by the team of Brett J. Gladman, John J. Kavelaars, Jean-Marc Petit, Hans Scholl, Matthew J. Holman, Brian G. Marsden, Philip D. Nicholson and Joseph A. Burns, which was reported to the Minor Planet Center but not published as an IAU Circular (IAUC).〔(MPEC 2000-Y16: ''S/1975 J 1 = S/2000 J 1, S/1999 J 1'' ) 2000 December 19 (recovery and ephemeris)〕
In October 2002 it was officially named after Themisto,〔(IAUC 7998: ''Satellites of Jupiter'' ) 2002 October 22 (naming the moon)〕 daughter of the river god Inachus and lover of Zeus (Jupiter) in Greek mythology.
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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