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2009 WM1
is a near-Earth asteroid〔( smallbodies ) 13:52 9.10.11〕 that is estimated to be 280 metres in diameter with an estimated mass of 2.9 kg.〔 When the asteroid was first discovered for about a month it was briefly listed at a Torino Scale of 1 and a cumulative Palermo Scale of −0.87.〔 It was removed from the Sentry Risk Table on 26 June 2013.〔 will pass from Earth on 2059-Nov-23.〔 Even though has an Earth MOID of , the orbit and future close approaches are well determined with an orbital uncertainty of 1.〔 will pass Earth at a distance of to 0.069AU on 2199-Nov-23,〔 but since it is a close approach and the exact distance in uncertain, future close approaches after 2199 are uncertain. == 2014 passage == The 21 May 2014 Earth close approach of should allow a refinement to the orbit.〔 From 7 May 2014 until 2 June 2014 the asteroid will be brighter than apparent magnitude 20.〔 The asteroid will come to opposition on 18 May 2014 when it will be up all night.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「2009 WM1」の詳細全文を読む
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