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(also written 2014 HQ124) is a near-Earth asteroid roughly in diameter that passed 3.25 lunar distances (LD) from Earth on 8 June 2014.〔 It was discovered on 23 April 2014 by NEOWISE.〔 It is estimated that an impact event would produce the equivalent of 2,000 megatons of TNT and create a impact crater.〔 The news media misleadingly nicknamed it, ''The Beast''.〔https://twitter.com/AreciboRadar/status/475709720842366977〕 previously passed this close to Earth in 1952〔 and will not again until at least 2307.〔 Radar imaging suggests it may be a contact binary.〔 ==2014 close approach== On 6 June 2014, the asteroid brightened to about apparent magnitude 13.7 while in the southern constellation of Horologium.〔 Near its closest approach to Earth of 3.25 Lunar distances on 8 June 2014, the asteroid crossed the celestial equator, making it a northern hemisphere object. It however had an elongation of about 20 degrees from the Sun,〔 and was lost in astronomical twilight during the closest approach to Earth. The Goldstone Deep Space Network observed the asteroid later on 8 June 2014,〔 when the asteroid was between 3.6 and 3.8 lunar distances.〔 On average, an object about the size of will pass this close to Earth every few years.〔 Similar events, where other 100+ meter diameter asteroids have or will soon pass less than 4 LD from Earth, include: *4179 Toutatis (~3000 meters in diameter) passed 4.0 LD from Earth on 29 September 2004 * (~500 meters in diameter) passed 1.1 LD from Earth on 3 July 2006 * (~360 meters in diameter) passed 0.8 LD from Earth on 8 November 2011 * (~140 meters in diameter) passed 3.2 LD from Earth on 4 March 2014〔 * (~600 meters in diameter) passed 3.1 LD from Earth on 26 January 2015〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「2014 HQ124」の詳細全文を読む スポンサード リンク
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