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Tarvos ( ), or Saturn XXI, is a prograde irregular satellite of Saturn. It was discovered by John J. Kavelaars et al. on September 23, 2000, and given the temporary designation S/2000 S 4. The name, given in August 2003, is after Tarvos, a deity depicted as a bull god carrying three cranes alongside its back from Gaulish mythology.〔(IAUC 8177: ''Satellites of Jupiter, Saturn, Uranus'' ) August 8, 2003 (naming the moon)〕 Tarvos orbits Saturn at an average distance of 18 million km in 926 days and is about 15 km in diameter (assuming an albedo of 0.04). It has the most eccentric orbit around Saturn.〔 It is a member of the Gallic group of irregular satellites. With a similar orbit and displaying a similar light-red colour, Tarvos is thought to have its origin in the break-up of a common progenitor〔〔Gladman, B. J.; Nicholson, P. D.; Burns, J. A.; Kavelaars, J. J.; Marsden, B. G.; Holman, M. J.; Grav, T.; Hergenrother, C. W.; Petit, J.-M.; Jacobson, R. A.; and Gray, W. J.; (''Discovery of 12 satellites of Saturn exhibiting orbital clustering'' ), Nature, 412 (July 12, 2001), pp. 163–166〕 or to be a fragment of Albiorix.〔Grav, Tommy; and Bauer, J.; (''A deeper look at the colors of Saturnian irregular satellites'' )〕 == References == *Ephemeris (IAU-MPC NSES ) 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「Tarvos (moon)」の詳細全文を読む スポンサード リンク
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