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2000 SG344
(also written 2000 SG344) is a small Aten asteroid discovered in 2000. It is estimated have a diameter of 37 meters (twice that of the Chelyabinsk meteor) and a mass of (71,000 tonnes).〔
Because of its very Earth-like orbit and the fact that it would have been near the Earth in 1971 (coinciding with the Apollo program), there was speculation that might not be an Asteroid but actually a man made object such as an S-IVB booster stage from a Saturn V rocket. (cf. J002E3, the S-IVB booster of Apollo 12 which was mistaken for an asteroid.)
==Possible impacts with Earth==
Until December 2004, it was considered to have the highest (though still very low) likelihood of any near-Earth object to impact Earth in the next 100 years. It is ranked a zero on the Torino Scale of impact risk because of its small size (the scale is 0–10) and is listed on Sentry Risk Table. It was briefly surpassed in December 2004 by 99942 Apophis (which at the time was known only by its provisional designation ). The smaller asteroids and have a greater chance of impacting Earth.
Based on 31 observations of made from May 1999 to October 2000, there is about a 1 in 417 chance that it will collide with Earth between 2069 and 2113. Assuming the object is a rocky asteroid, the impact energy released would be an estimated 1.1 megatons of TNT,〔 which would create an impact crater approximately wide assuming it does not explode in the atmosphere
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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