Understanding the Distribution of Near-Earth Asteroids-Reference-Cited by-同舟云学术

Understanding the Distribution of Near-Earth Asteroids

Published:2000-06-23 Issue:5474 Volume:288 Page:2190-2194
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Bottke William F.¹,Jedicke Robert²,Morbidelli Alessandro³,Petit Jean-Marc³,Gladman Brett³

Affiliation:

1. Center for Radiophysics and Space Research, Cornell University, Ithaca, NY 14853–6801, USA.

2. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA.

3. Observatoire de la Côte d'Azur, Boite Postale 4229, 06034 Nice Cedex 4, France.

Abstract

We have deduced the orbital and size distributions of the near-Earth asteroids (NEAs) by (i) numerically integrating NEAs from their source regions to their observed orbits, (ii) estimating the observational biases and size distribution associated with asteroids on those orbits, and (iii) creating a model population that can be fit to the known NEAs. We predict that there are ∼900 NEAs with absolute magnitude less than 18 (that is, kilometer-sized), of which 29, 65, and 6% reside on Amor, Apollo, and Aten orbits, respectively. These results suggest that roughly 40% of the kilometer-sized NEAs have been found. The remainder, on highly eccentric and inclined orbits, are more difficult to detect.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference66 articles.

1. NEAs have perihelion distances q ≤ 1.3 AU and aphelion distances Q ≥ 0.983 AU. NEA subgroups include the Amors (1.0167 AU < q ≤ 1.3 AU); Apollos ( a ≥ 1.0 AU q ≤ 1.0167 AU) and Atens ( a < 1.0 AU Q ≥ 0.983 AU). D. Rabinowitz E. Bowell E. M. Shoemaker K. Muinonen in Hazards due to Comets and Asteroids T. Gehrels Ed. (Univ. of Arizona Press Tucson AZ 1994) pp. 285–312.

2. L. A. McFadden D. J. Tholen G. J. Veeder in Asteroids II R. P. Binzel T. Gehrels M. S. Matthews Eds. (Univ. of Arizona Press Tucson AZ 1989) pp. 442–467.

3. See for instance the chapters by G. Neukum and B. A. Ivanov; O. B. Toon K. Zahnle R. P. Turco and C. Covey; and M. R. Rampino and B. M. Haggerty in Hazards due to Comets and Asteroids T. Gehrels Ed. (Univ. of Arizona Press Tucson AZ 1994) pp. 359–416 pp. 791–826 and pp. 827–858 respectively.

4. Chapman C. R., Morrison D., Nature 367, 33 (1994).

5. We used the April 2000 update of the public-domain asteroid orbit database “astorb.dat” found at also E. Bowell K. Muinonen and L. H. Wasserman in Asteroids Comets Meteors 1993 A. Milani M. DiMartino A. Cellino Eds. (Kluwer Dordrecht Netherlands 1994) pp. 477–481.

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