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2010 RF12
is a near-Earth asteroid that passed between Earth and the Moon on September 8, 2010 at 21:12 UTC, approaching Earth within above Antarctica.〔(Harvard scientists keep an eye on wayward asteroids )〕
NASA's Near Earth Program estimates its size to be in diameter with a mass of around 500 tonnes.〔 will make many more close approaches to Earth, with the approach of September 5−6, 2095 having a 6% chance (1 in 16) of colliding with Earth.〔〔 The nominal JPL Earth approach in 2095 is 〔 with Earth having a radius of approximately . Due to the asteroid's relatively small size, there is little danger of harm arising from such an impact, rather there would be an impressive fireball as the rock air burst in the upper atmosphere.〔(How a Near-Earth Object Impact Might Affect Society, 9 January 2003, Clark R. Chapman, SwRI, Boulder CO USA )〕 The power of the airburst would be somewhere between the Sutter's Mill meteorite and the Chelyabinsk meteor. The nominal NEODyS orbit shows that the asteroid will pass from Earth on September 6, 2095, with an apparent magnitude of ~12.〔
The asteroid was discovered by the Catalina Sky Survey near Tucson, Arizona on September 5, 2010 along with 2010 RX30.〔(Second Asteroid to Buzz Earth Later Today )〕
==See also==
* , a similar-sized asteroid that passed Earth the same day
* , an Earth threatening S-IVB booster?
*
* List of asteroid close approaches to Earth, for other close approaches
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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