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2012 TC4
is a Near-Earth Asteroid and Apollo asteroid that will make a close approach to Earth early on October 12, 2017 between 0.00008818 and 0.002896 AU (0.034 to 1.127 LD, 13200–433200 km, 8200-269200 mi.)
The asteroid, however, only has an observation arc of 7 days, between October 4, 2012, and October 11th, 2012, so the exact distance of its closest approach is uncertain. The asteroid has been known to make many close approaches to Earth in the past, including an approach of 0.000634 AU (0.247 LD, 94,800 km, 58,900 mi) on October 12, 2012, during which the asteroid was discovered.
==Rotation==
Studies of the asteroid's light curve found it to have a rotation period of approximately 12 minutes and 14 seconds,〔 relatively slow for the asteroid's size (10-20 meter) as small asteroids have been found to rotate much faster; asteroid 2014 RC, a similarly-sized NEO, has a rotation period of only 16 seconds.
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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