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(242450) 2004 QY2
is a large near-Earth asteroid and potentially hazardous object.〔 It has a well determined orbit with an observation arc of 7 years and an uncertainty parameter of 0.〔 It was discovered on 20 August 2004 by the Siding Spring Survey at an apparent magnitude of 16.5 using the Uppsala Southern Schmidt Telescope.〔
Based on an absolute magnitude of 15,〔 the asteroid has an estimated diameter of 3.5 to 7.7 km.〔 is one of the largest potentially hazardous asteroids (PHA) discovered.〔 it has the brightest absolute magnitude of any PHA since its discovery.〔 On 29 July 2012 it passed Earth at a distance of .〔
Given the estimated size of roughly 5km, is one of the largest objects to appear on the Sentry Risk Table.〔 It was removed from the Sentry Risk Table on 25 August 2004.〔
== References ==
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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