Asteroid 2012 DA14
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The asteroid will not impact Earth on February 15, 2013. The uncertainty region of 2012 DA14 during planetary encounters is well determined through 2134.
2012 DA14 was removed from the Sentry Risk Table on 7 February 2013. There is no risk of impact in the next hundred years.
It is estimated that there are more than a million near-Earth asteroids smaller than 100 meters.
If it were to hit Earth in the distant future, it is estimated that it would enter the atmosphere at 12.7 km/s, and produce an air burst with the equivalent of 2.4 megatons of TNT at an altitude of roughly 10 kilometers (33,000 ft). The Tunguska event has been estimated at 3-20 megatons. Asteroids about 50 meters in diameter are expected to impact Earth once every 1200 years or so. Such an impact could be a city-killer, as asteroids larger than 35 meters across can pose a threat to a town or city.
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