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(29075) 1950 DA
(29075) 1950 DA is a near-Earth asteroid. Among asteroids more than 1 km in diameter, it is notable for having the highest known probability of impacting Earth.〔 In 2002, it had the highest Palermo rating with a value of 0.17 for a possible collision in 2880.〔 In 2013, the odds of an Earth impact in 2880 were estimated as 1 in 4,000 (0.025%) with a Palermo rating of −0.83.〔 In 2014, the odds of an Earth impact were further reduced to only 1 in 20,000 (0.005%) with a Palermo rating of −1.81.〔 (29075) 1950 DA is not assigned a Torino scale rating, because the 2880 date is over 100 years in the future.
==Discovery and name==
(29075) 1950 DA was first discovered on February 23, 1950, by Carl A. Wirtanen at Lick Observatory.〔 It was observed for seventeen days〔 and then lost because the short observation arc resulted in large uncertainties in Wirtanen's orbital solution. On December 31, 2000, it was recovered as and two hours later was recognized as (29075) 1950 DA.〔
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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