Istituto di Scienza e Tecnologie dell'Informazione     
Valsecchi G. B., Milani A., Rossi A., Tommei G. 2004 MN4 keyholes. In: IAU Symposium (Buzios, Rio De Janeiro, Brasil, 7 - 12 August, 2005).
Asteroid 2004 MN4 will undergo a very close encounter with the Earth in 2029. Although its orbit is rather well determined, the uncertainty in the 2029 encounter distance spans a few Earth radii. In any case, the asteroid orbit will suffer a very large perturbation, and the range of post-encounter orbital periods currently allowed by the available astrometry encompasses a number of mean motion resonances. This opens the door to the possibility of resonant returns, with both the asteroid and the Earth making an integer number of heliocentric revolutions, and coming back to collision, or near collision, within a few years. In the 2029 b-plane the small regions through which 2004 MN4 has to pass in order to end up impacting the Earth at a resonant return are called keyholes. We characterize those leading to impact at resonant returns in 2034, 2035, 2036 and 2037 both in the framework of the analytical theory of resonant returns, and by using state-of-the-art numerical integrations.
Subject Physical Sciences and Engineering
J.2 Physical Sciences and Engineering

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