Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt.........6b&link_type=abstract
Ph.D. Thesis Texas Univ., Austin.
Astronomy and Astrophysics
Astrophysics
Asteroid Belts, Asteroids, Collisions, Evolution (Development), Amplitudes, Angular Momentum, Astrophysics, Mathematical Models, Rotation, Surveys
Scientific paper
A major observational survey was conducted to investigate asteroid collisional evolution processes. Photoelectric observations of more than 100 small asteroids were obtained at the University of Texas McDonald Observatory and Cerro Tololo Inter-American Observatory on 150 nights between November, 1982 and February, 1985. These lightcurve data were used to determine shapes and rotational angular momenta of asteroids in six distinct dynamical regions: near the 3:1 resonance Kirkwood gap, Eos family members, Koronis family members, and three control groups. The survey data were analyzed to shed light on two major outstanding problems in solar system astrophysics: the collisional formation of the Kirkwood gaps and the collisional evolution of the Eos and Koronis families. It is concluded that inter-asteroid collisions are not an important process in clearing the Kirkwood gaps. The survey data show that Koronis and Eos families have distinctly different rotational properties from non-family asteroids and each other. A numerical model for asteroid collisions was developed to investigate the time evolution of rotational angular momentum. The modeling results imply that the Eos family is significantly more collisionally evolved than the Koronis family and is therefore probably older.
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