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(308242) 2005 GO21 : ウィキペディア英語版 | (308242) 2005 GO21
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 1 April 2005 by the Siding Spring Survey at an apparent magnitude of 18.1 using the Uppsala Southern Schmidt Telescope.〔 Based on an absolute magnitude of 16.4,〔 the asteroid has an estimated diameter of 1.6 km (within a factor of two).〔 is the largest potentially hazardous asteroid (PHA) discovered in 2005.〔 On 21 June 2012 it passed Earth at a distance of .〔 The 2012 passage was studied with radar using Goldstone and Arecibo.〔 == References ==
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