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(309239) 2007 RW10
, also written (309239) 2007 RW10, is a temporary quasi-satellite of Neptune.〔 Observed from Neptune, it would appear to go around it during one Neptunian year but it actually orbits the Sun, not Neptune.
==Discovery, orbit and physical properties==
was discovered by the Palomar Distant Solar System Survey on September 9, 2007.〔(【引用サイトリンク】url=http://www.minorplanetcenter.net/mpec/K07/K07X06.html )〕 At the time of discovery, this minor body was believed to be a Neptune trojan,〔(【引用サイトリンク】url=http://www.boulder.swri.edu/ekonews/issues/past/n055/html/index.html )〕 but it is no longer listed as such.〔(【引用サイトリンク】url=http://www.boulder.swri.edu/ekonews/issues/past/n056/html/index.html )〕〔Minor Planet Center (List Of Neptune Trojans ) (2007-12-01)〕 The Jet Propulsion Laboratory classifies as trans-Neptunian object but
the Minor Planet Center includes the object among centaurs. It moves
in an orbit with an inclination of 36.1°, a semi-major axis of 30.32 AU, and an eccentricity of 0.2996.〔(【引用サイトリンク】url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007RW10 )〕 Herschel-PACS observations indicate that it has a diameter of 247 km.〔
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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