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2006 RH120
is a tiny near-Earth asteroid〔 with a diameter of about 2–3 meters〔 that ordinarily orbits the Sun but makes close approaches to the Earth–Moon system around every twenty years,〔 when it can temporarily enter Earth orbit through ''temporary satellite capture'' (TSC). Most recently, it was in Earth orbit from September 2006 to June 2007.〔(I. Klotz – Mystery Mini Moons: How Many Does Earth Have? (2012) – Discovery News )〕
Until given a minor planet designation on 18 February 2008,〔 the object was known as 6R10DB9, an internal identification number assigned by the Catalina Sky Survey.
== Discovery ==
was discovered on 14 September 2006 by the Schmidt camera of the Catalina Sky Survey in Arizona.〔(【引用サイトリンク】title=Distant Artificial Satellites Observation (DASO) Circular No. 68, 2006 Sept. 17, 16:59 UT )〕 "6R10DB9"〔 was the Catalina Sky Survey's own discovery designation for this object, which usually would only be used on the MPC's NEO Confirmation Page (NEOCP) until an IAU designation was applied, if the object was classified as a minor object. It was added on 14 September to the NEOCP and subsequently removed with the explanation that it "was not a minor planet".〔(【引用サイトリンク】title=Major News About Minor Objects, April 18, 2007 )〕 Preliminary orbital calculations indicated it was captured by Earth's gravity from solar orbit of a period of about 11 months, which is similar to that of many spent rocket boosters dating to the Apollo program of the 1960s and early 1970s. 6R10DB was assigned the designation on 18 February 2008.〔
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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