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(391211) 2006 HZ51 : ウィキペディア英語版 | (391211) 2006 HZ51
is an 800 meter in diameter asteroid discovered on 27 April 2006 by the Catalina Sky Survey that with a 1.1 day observation arc was thought to have a 1 in 6 million chance of hitting Earth on 21 June 2008.〔 Further refinement of the orbit quickly eliminated the risk. The preliminary orbit solution was at first thought to have a period of 7 years and a perihelion of ~1.1 AU. (2006-H58, 28 April 2006, 2-day orbit ). ==References==
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