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2014 UR116
(also known as 2008 XB) is an asteroid categorized as a near-Earth object and potentially hazardous asteroid with a diameter of roughly .〔 On 21 October 2014, the asteroid passed from Earth.〔 On 10 April 2047, the asteroid will safely pass from Earth.〔
Although some inaccurate press reports have suggested that it may pose an impact risk to Earth, the NASA/JPL Near Earth Object Program Office reported that it poses no risk of impact to any planet for at least 150 years.〔〔(【引用サイトリンク】title=NASA Says Asteroid 2014 UR116 Is Nothing to Be Afraid Of )〕 Between 1904 and 2174, the closest approach it makes to any planet was on 9 June 2008 when it passed from Mars.〔 The asteroid has never been listed on the Sentry Risk Table and has a well determined orbit with an observation arc of 6 years.〔
== Discovery ==
The asteroid was first detected ''(also see precovery)'' on 1 December 2008 by the Mount Lemmon Survey and received the provisional designation 2008 XB.〔 However, at an apparent magnitude of 20 and an assumed orbital eccentricity of 0.3, the object had a very short observation arc of less than 2 hours and 2008 XB became a lost minor planet.〔 It was only recovered as on 27 October 2014 by observers at the MASTER-II observatory in Kislovodsk, Russia. The body is now known to have an eccentricity of 0.72.〔
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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