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(357439) 2004 BL86
,〔 provisionally known as , is a near-Earth asteroid estimated to be about in diameter.〔 It was discovered on 30 January 2004 by LINEAR.〔 It passed , or 3.1 lunar distances, from Earth on 26 January 2015 at 16:20 UTC.〔〔 During the 2015 approach it was determined to have a satellite.
== 2015 Earth approach ==
On 26–27 January 2015, the asteroid briefly peaked around apparent magnitude 9 and was near the celestial equator.〔 The asteroid was visible in telescopes with objectives of or larger; high-end binoculars under a dark sky may also have worked.〔 Near closest approach the asteroid was moving about 2.5 degrees per hour (2.5 arcseconds per second).〔〔 The asteroid came to opposition (furthest elongation in the sky from the Sun) on 27 January 2015 at 04:37 UTC.〔 Around 5:00 UTC, the asteroid was near M44 (the Beehive Cluster).〔
26 January 2015 approach of 3.1 lunar distances was the closest approach of for at least the next 200 years.〔〔 For comparison, about twice the size of , passed , or 1.3 lunar distances, from Earth on 31 October 2015.〔
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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