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Abstract: The number of known Earth crossing asteroids (ECAs) approaching the Earth within a distance of 0.1 AU during a time period of 150 yr is used to derive the intrinsic collision probability P_{i}. P_{i} strongly depends on the asteroid absolute magnitude H in the studied interval between 17.0 and 20.0. However, it is shown that the dependence may be strongly reduced after a higher percentage of the total population of ECAs up to a given H is known.
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Last update: June 23, 2005