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2010 TD54
is a small asteroid-like object that was discovered in an orbit that crossed through the Earth-moon system. It made its closest approach at 10:51, 12 October 2010 UTC (6:51 EDT a.m.). NASA reported its size as about 5 to 10 metres in diameter, possessing an absolute magnitude of 28.9;〔(JPL Small-Body Database Browser: (2010 TD54) )〕 its closest approach to Earth was about ,〔 one of the closest known approaches of an asteroid to Earth, at which time the object appeared about 14th magnitude. One of the Catalina Sky Survey telescopes north of Tucson, Arizona discovered it on 9 October 2010.〔
has an Earth Minimum orbit intersection distance (MOID) of .〔 It was removed from the Sentry Risk Table on 11 October 2010.〔 The asteroid may have passed from Earth in October 1979, but the nominal orbit suggests it passed millions of kilometres from Earth in 1979.〔
==See also==
* List of asteroid close approaches to Earth, for other close approaches
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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