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(417634) 2006 XG1
(417634) 2006 XG1 (also written 2006 XG1) is a near-Earth asteroid that had a low but non-zero probability of impacting Earth on October 31, 2041.〔 Originally listed with a Torino Scale hazard rating of 0, this was raised to a rating of 1 on December 22, 2006 as a result of additional observations and refinement of the orbital calculations.〔 However, on January 9, 2007 it was returned to a rating of 0. It was removed from the Sentry Risk Table on February 7, 2007.〔 It is now known that the asteroid will not make a close approach to the Earth in 2041.〔 On October 31, 2041 the asteroid will be from the Earth.〔〔
was discovered on September 20, 2006 by the University of Arizona's Catalina Sky Survey using a Schmidt–Cassegrain telescope.〔 The object is estimated to be between 600 and 1300 meters by NEODyS, and approximately 670 meters by the JPL Sentry System. The estimated mass is 4.2×1011 kg.
passed from asteroid 87 Sylvia on 1969 June 20.〔
== 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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