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2007 CA19
(also written 2007 CA19) is a near-Earth asteroid. It led the impact hazard list, with a Torino Scale impact risk value of 1, for one week, ending on February 19, 2007. Before and after , 99942 Apophis was the object with the highest Palermo Scale rating. With an observation arc of 4.8 days, had a Palermo Scale of −0.88.〔 was discovered on February 11, 2007 by the Catalina Sky Survey at the University of University of Arizona. The object is estimated at 966 metres in diameter with a mass of a 1.2x1012 kg. Until February 15, it had an impact probability of 1/625000 for the day March 14, 2012.〔 Additional observations through February 19 decreased the impact probability to ~1 in 300 million, making it of negligible concern. It was removed from the Sentry Risk Table on February 22, 2007.〔 passed about from Venus on July 6, 1946.〔 == References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「2007 CA19」の詳細全文を読む
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