Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1399w&link_type=abstract
Lunar and Planetary Science, volume 27, page 1399
Physics
Accretion, Comets, Planetesimals, Solar Nebula
Scientific paper
The record of the formation of planetesimals from microscopic grains has been obscured in the asteroid belt by aqueous alteration, thermal metamorphism, and collisional processing. Comets, the most primitive members of the solar system, are more likely to preserve evidence of their accretion. The detection of comets in situ in the Kuiper belt shows that they originated as icy planetesimals in the outer Solar Nebula. Comets are physically and compositionally heterogenous; outbursts and jetting suggest a preferred scale for these inhomogeneities ~100 m. Models of the tidal disruption of S-L 9 suggest that the parent comet separated into a swarm of components ~100 m or smaller in size before reaccreting into the observed subnuclei. These properties may be due to their accretion in the presence of gas in the Solar Nebula, which tended to produce structure on this scale due to the size-dependence of drag-induced velocities.
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