Istituto di Scienza e Tecnologie dell'Informazione     
Valsecchi G. B., Rossi A., Milani A., Chesley S. Collision probability: a new analytical derivation. In: Mathematics and Astronomy: a joint long journey (Madrid, Spain, 23-27 november 2009). Proceedings, vol. 1283 pp. 231 - 238. de Leˇn M., de Diego D.M., Ros R.M (eds.). (AIP Conference Proceedings). American Institute of Physics, 2010.
We characterize the region in orbital elements space containing collisions solutions of a small body with a planet, in the framework of the analytical theory of close encounters. This allows us to derive an analytical estimate of the probability of collision somewhat different from the well-known one given by Ípik.
Subject Near Earth Asteroids
Collision probability
Impact risk
J.2 Physical Sciences and Engineering

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