Origins for the near-earth asteroids

Details Origins for the near-earth asteroids Origins for the near-earth asteroids

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...257..779b&link_type=abstract

Science (ISSN 0036-8075), vol. 257, no. 5071, Aug. 7, 1992, p. 779-782. Research supported by Lowell Observatory.

Physics

33

Asteroids, Comet Nuclei, Light Curve, Rotation

Scientific paper

Because of their short dynamical lifetimes, the population of near-earth asteroids (NEAs) must be resupplied. Two sources have been hypothesized: main-belt asteroids and extinct comet nuclei. A new survey of physical properties for less than 5 kilometers diameter main-belt asteroids reveals that their spin rate and shape distributions are similar to those of NEAs, as is fully consistent with a main-belt origin for most NEAs. Physical data on comet nuclei are limited. If the existing sample is representative of the comet population, analysis of the asteroid and comet samples constrains the fraction of comet nuclei to between 0 and 40 percent of the total NEA population.

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