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(392741) 2012 SQ31
, also known as 2004 PR107, 2009 YS20 and 2012 SQ31〔((392741) = 2004 PR107 = 2009 YS20 = 2012 SQ31 )〕 is an asteroid in the asteroid belt with an absolute magnitude (H) of 17.8.〔 It was discovered on August 11, 2004 by Cerro Tololo Inter-American Observatory,〔 and then lost due to a lack of follow-up observations.
With an observation arc of only 1 day (consisting of only two images), was thought to be a trans-Neptunian object with a semi-major axis (a) of 46 AU.〔 Mike Brown's website listed it as a likely a dwarf planet with an estimated diameter of 555 km.〔 It was rediscovered in 2009 as ,〔 but was not identified at the time as being related to . The lost asteroid was rediscovered as and determined to be a small, ~1-kilometer asteroid in the asteroid belt.〔 Precovery images from December 5, 2002 have been located.〔
==References==
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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