(392741) 2012 SQ31
(392741) 2012 SQ31, also known as 2004 PR107, 2009 YS20 and 2012 SQ31<ref name=MPC>(392741) = 2004 PR107 = 2009 YS20 = 2012 SQ31</ref> is an asteroid in the asteroid belt with an absolute magnitude (H) of 17.8.<ref name=jpldata/> It was discovered on August 11, 2004 by Cerro Tololo Inter-American Observatory,<ref name="MPEC2004-R15"/> and then lost due to a lack of follow-up observations.
With an observation arc of only 1 day (consisting of only two images), 2004 PR107 was thought to be a trans-Neptunian object with a semi-major axis (a) of 46 AU.<ref name="MPEC2004-R15"/> Mike Brown's website listed it as a likely a dwarf planet with an estimated diameter of 555 km.<ref name=Wayback111018/> It was rediscovered in 2009 as 2009 YS20,<ref name=MPC/> but was not identified at the time as being related to 2004 PR107. The lost asteroid was rediscovered as 2012 SQ31 and determined to be a small, ~1-kilometer asteroid in the asteroid belt.<ref name=jpldata/> Precovery images from December 5, 2002 have been located.<ref name=MPC/>
(392741) 2012 SQ31 sections
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