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2014 RC
2014 RC is a small near-earth asteroid that made a close approach to Earth of (0.1 lunar distances) around 18:02 UTC on 7 September 2014.〔〔 It is the fastest rotating asteroid so far discovered. The asteroid briefly brightened to about apparent magnitude 11.5,〔 so it was not visible to the naked eye or common binoculars. At the peak brightness the asteroid had a declination of –47,〔 and was most easily visible over New Zealand. The asteroid is approximately the diameter of the Chelyabinsk meteor,〔 and passed almost as close to Earth as 367943 Duende (2012 DA14) did in 2013. During 2014, asteroids 2014 AA and have come closer to Earth. 2014 RC was removed from the JPL Sentry Risk Table on 5 September 2014 and there are no known possible impact dates in the next 100 years.〔 On 8 September 2115 the asteroid will pass about from the moon.〔 On 5 September 1973, the asteroid passed between and from Earth.〔
==Orbital shift==
During the 2014 Earth close approach the orbital period of 2014 RC was reduced from 600 days to 549 days.〔(【引用サイトリンク】Horizons output ">url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2014RC ) ("Ephemeris Type: Elements" PR value)〕 The orbital eccentricity decreased while the orbital inclination increased.
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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