Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..561c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Dec. 15, 1991, p. 561-574. Research supported by M
Astronomy and Astrophysics
Astronomy
73
Asteroid Belts, Infrared Astronomy Satellite, Size Distribution, Albedo, Orbital Mechanics
Scientific paper
A set of 4000 numbered asteroids from the main belt are examined in terms of size distribution with attention given to subsets of the objects that relate to family membership and semimajor axis range. The IRAS database is employed to estimate albedo and diameter, and non-IRAS procedures are used check the albedo estimates. Nonfamily asteroids tend toward distributions with a marked change in slope at diameters of about 150 km and with a differential power-law distribution exponent with values of about 3 for large objects down to about 1 for small objects. The findings are contradicted only by the Flora region in which the sample is complete to sizes as small as 18 km and with a steep slope at small sizes. The findings suggest that collisional evolution did not play a significant role in the asteroidal evolution and that the asteroids are fragments from catastrophic collisions.
Cellino Alberto
Farinella Paolo
Zappalá Vincenzo
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