The cometary contribution to planetary impact rates

Bibcode
2001ASSL..261..131R
Rickman, H.; Fernández, J. A.; Tancredi, G.; Licandro, J.
Referencia bibliográfica

In: Collisional processes in the solar system, ed. by: Mikhail Ya. Marov and Hans Rickman, Astrophysics and space science library, Volume 261, Dordrecht: Kluwer Academic Publishers, ISBN 0-7923-6946-7, 2001, p. 131 - 142

Fecha de publicación:
0
2001
Número de autores
4
Número de autores del IAC
0
Número de citas
7
Número de citas referidas
6
Descripción
We use statistics on the nuclear magnitudes of Jupiter Family comets to derive the number of km-sized members with perihelion distances less than 2 AU. When coupled with impact rates per comet taken from Levison et al. (2000), and with our estimate of the number of dormant comets in similar orbits yielding a dormant/active ratio of about 2, we find a terrestrial impact rate of about 1×10-6 per year. This is already significant (~20 - 50%) compared with the total estimated impact rate by km-sized bodies from cratering statistics, and we estimate that further contributions by Halley-type and long-period comets are also substantial. Thus, in broad agreement with a number of earlier investigators, we find that comets yield a large, perhaps dominant, contribution to km-sized terrestrial impactors.
Tipo
Sin árbitro
Cometas
Júpiter

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