The cometary nucleus as an aggregate of planetesimals

Details The cometary nucleus as an aggregate of planetesimals The cometary nucleus as an aggregate of planetesimals

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988icar...75..540y&link_type=abstract

Icarus (ISSN 0019-1035), vol. 75, Sept. 1988, p. 540-551. Research supported by the University of Tsukuba.

Computer Science

16

Comet Nuclei, Mass Spectroscopy, Protoplanets, Solar System, Oort Cloud, Spatial Distribution, Star Formation

Scientific paper

The present treatment of the properties of extant, primordial solar nebula-generated planetesimals and their aggregates, with a view to cometary origins, takes Greenberg et al.'s (1984) suggested formation of a small-mass planetesimal by the nonhomologous sedimentation of grains into account. It is noted that the mass of a planetesimal formed by gravitational instability of the dust layer is related to the total number of comets, and it is shown that the planetesimal's initial mass is 4 to 7 orders-of-magnitude smaller than that estimated by assuming complete grain sedimentation. The presence of a cometary cloud beyond the planetary region but closer than the Oort cloud is hypothesized.

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