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(436724) 2011 UW158
, provisionally known as 2011 UW158, is a near-Earth asteroid and potentially hazardous object.〔 It was discovered in 2011 from the Pan-STARRS observatory at Haleakala, Hawaii, U.S.A.
The asteroid was listed as level 1 in the Torino Scale on 4 November 2011, 9 days after its discovery,〔(【引用サイトリンク】title=2011 UW158 Impact Risk )〕 but was removed two weeks later.〔(【引用サイトリンク】title=NEOs Removed from Impact Risks Tables )〕
In July 2015, it made a close approach to Earth, attracting the interest of astronomers. It has an unusually short rotation period of 37 minutes, suggesting it is a large boulder rather than a rubble pile.〔(【引用サイトリンク】url=http://astronomynow.com/2015/07/19/first-detailed-images-of-rare-asteroid-to-pass-close-by-earth-on-19-july/ )〕 It also attracted the media and even by firms such as Planetary Resources〔(【引用サイトリンク】url=http://news.sky.com/story/1521488/mining-firm-aiming-for-platinum-loaded-asteroid )〕 for its alleged content of precious metals worth as high as 5 trillion U.S. dollars.〔(【引用サイトリンク】url=http://www.mirror.co.uk/news/world-news/uw-158-watch-live-asteroid-worth-6097254 )〕〔(【引用サイトリンク】title=What you can expect to see as a £3 trillion asteroid passes Earth tonight )〕〔(【引用サイトリンク】title=$5 Trillion Dollar Asteroid Makes Close Approach to Earth )〕 Users at (Space Exploration ) StackExchange have denied these estimations as being ''orders of magnitude too high''.〔(【引用サイトリンク】title=How is it known that asteroid 2011 UW158 has so much platinum? )〕
== 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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