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(164207) 2004 GU9 : ウィキペディア英語版 | (164207) 2004 GU9
is a small near-Earth asteroid in the Apollo asteroid family. It will be a quasi-satellite of Earth until around 2600.〔(Dynamical evolution of Earth’s quasi-satellites: 2004 GU9 and 2006 FV35 )〕 On 14 April 2004 (with less than a 1-day observation arc), the Sentry Risk Table showed 180 virtual impactors.〔(【引用サイトリンク】title=Major News about Minor Objects: Risk monitoring )〕 It was removed from the Sentry Risk Table 2 days later on 16 April 2004.〔(【引用サイトリンク】publisher=NASA/JPL Near-Earth Object Program Office )〕 now has a well determined orbit with an observation arc of 12 years. ==See also==
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