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2007 TU24
is an asteroid that was discovered by the Catalina Sky Survey in Arizona on October 11, 2007. Imaging radar has estimated that it is in diameter.〔 The asteroid passed 554,209 kilometer (344,370 mile or 1.4-lunar distance) from Earth on January 29, 2008, at 08:33 UTC. (At the time of the passage it was believed the closest for any known potentially hazardous asteroid (PHA) of this size before 2027,〔(Near-Earth Asteroid 2007 TU24 to Pass Close to Earth on Jan. 29 - Should be Observable with Modest Sized Telescopes )〕 but in 2010 was measured to be 400 meters in diameter.) At closest approach the asteroid had an apparent magnitude of 10.3 and was about 50 times fainter than the naked eye can see. It required about a telescope to be seen.〔
==Impact risk assessment==
From the date of discovery of asteroid on 11 October 2007, a total of 316 observations of it had been made by 31 January 2008, spanning 112 days.〔 Now the asteroid has an observation arc of about 3 years and the trajectory is well defined.〔 It was removed from the Sentry Risk Table on 4 December 2007 at 14:05 UTC.〔(NEOs Removed from Impact Risks Tables )〕
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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