Structure and origin of cometary nuclei

Details Structure and origin of cometary nuclei Structure and origin of cometary nuclei

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8213035d&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Astronomical Models, Comet Nuclei, Cosmic Dust, Evolution (Development), Ice, Bolides, Brightness, Granular Materials, Irradiation, Meteorites, Oort Cloud, Orbits, Volatility

Scientific paper

There is strong evidence that a comet nucleus consists of a single object whose basic structure is Whipple's icy conglomerate. A number of cometary phenomena indicate that the nucleus is a low density, fragile object with a large degree of radial uniformity in structure and composition. Details of the ice-dust pattern are more uncertain. A working model is proposed which is based on theories of accumulation of larger objects from grains. This nucleus is a distorted spherical aggregate of a hierarchy of ice-dust cometesimals. These cometesimals retain some separate identity which lead to comet fragmentation when larger components break off. The outer layers of new comets were modified by cosmic ray irradiation in the Oort Cloud. The evidence for meteorite-comet association is still controversial. Current dynamical studies do not seem to require a cometary source of meteorites.

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