Orbital Evolution of Very Near-Earth Asteroids.

Details Orbital Evolution of Very Near-Earth Asteroids. Orbital Evolution of Very Near-Earth Asteroids.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1026n&link_type=abstract

American Astronomical Society, DPS meeting #28, #10.26; Bulletin of the American Astronomical Society, Vol. 28, p.1101

Astronomy and Astrophysics

Astronomy

Scientific paper

We recently examined the origin of the apparently anomalous population of Earth-approaching objects described by Rabinowitz et al., using a Monte-Carlo integration scheme. By its nature, this method accounts only for close planetary encounters, and not for Solar-System resonances. As these resonances are believed to be the primary mechanism for bringing asteroids to near-Earth space, this omission could be important. Therefore, we numerically integrated the orbits of 16 of these objects for 3x 10(6) y into the past using the RADAU integrator, considering the planets Venus--Neptune. We monitored close approaches to the Earth as well as secular resonances nu_5, nu_6, nu_ {16}, and the Kozai resonance. We also integrated 30 "clones" of each of the four "special" (very near-Earth and low eccentricity) objects for 2--10x 10(6) y. skip 5pt These orbit integrations show that secular resonances and Earth encounters mix the ``special population'' objects with Rabinowitz's expected population with a timescale of a few million years, which is much shorter than the collisional lifetimes of even these very small objects. Therefore, either, {1} The SSEAs are very young (possibly due to unusual delivery dynamics or to a recent event). {2} The observational biases are more complicated and severe than those calculated by Rabinowitz. {3} SSEAs are those objects from a special population that have not yet been perturbed into higher eccentricity orbits. Such objects must somehow be protected from planetary encounters to survive. Further integrations to determine the rate at which asteroids enter this "anomalous" zone are in progress.

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