Hilda Collisional Family Probably Affected by Planetary Migration

Details Hilda Collisional Family Probably Affected by Planetary Migration Hilda Collisional Family Probably Affected by Planetary Migration

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.0409b&link_type=abstract

American Astronomical Society, DPS meeting #42, #4.09; Bulletin of the American Astronomical Society, Vol. 42, p.949

Astronomy and Astrophysics

Astronomy

Scientific paper

We study long-term orbital evolution and also physical properties of the resonant family among Hilda asteroids (located in the J3/2 resonance with Jupiter). In case of 1st order resonances a systematic drift in eccentricity occurs due to the Yarkovsky/YORP effect, which enables us to determine the age more than 3.5 Gyr for the Hilda family. We constructed an N-body model for this purpose, which includes gravitational perturbation of planets, Yarkovsky drift and an updated YORP model for the evolution of spin axes.
The dynamics of the oldest asteroid families might be driven by planetary migration, which likely occurred 3.8 Gyr ago, and we test this possibility by various migration scenarios. The Hilda family is perturbed mainly by secondary resonances between Jupiter-Saturn 1:2 frequency and frequency of librations in the J3/2 resonance. Our results indicate that: 1) the family was created at the time, when Jupiter and Saturn were already far from a compact 1:2 configuration; 2) the migration of Uranus and Neptune was very fast, with a few Myr timescale.
We finally address two alternative hypotheses: 1) initial velocity field was extremely anisotropic; 2) small members of the family have higher albedos, but we find neither of them likely.

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