Diversity and similarity of comets

Details Diversity and similarity of comets Diversity and similarity of comets

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278...19d&link_type=abstract

In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 19-30(SEE N88-21884 14-91)

Computer Science

16

Chemical Composition, Chemical Evolution, Comets, Abundance, Brightness, Comet Nuclei, Comet Tails, Grain Size, Radiation Effects, Space Plasmas

Scientific paper

Although comets appear superficially very different, it is suspected that they were originally very similar. In particular, the elemental abundances of all pristine comets are likely to be "primitive", that is in solar abundance ratios for all elements including C, N, O, S, but with the exception of H (and assumedly He and Ne) that are severely depleted. The solid phase was originally in very fine grains, typically 0.1 μm or less, eventually sintered into larger grain clusters. The volatile phase contains H, C, N, O, S molecules frozen in the pores of the grain clusters; cosmic ray plus solar irradiation change the volatile to refractory ratio of the crust. Differences in dust tails and in plasma tails, in photometry between young and old comets and in the variable carbon depletion of the gas phase seem to be induced by the decay processes.

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