Mathematics – Logic
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.255g&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 255-263 (SEE N
Mathematics
Logic
Comet Nuclei, Cosmic Dust, Evolution (Development), Halley'S Comet, Refractory Materials, Albedo, Density Distribution, Mass Spectroscopy, Oort Cloud, Particle Size Distribution, Solar Heating
Scientific paper
The chemistry and morphological structure of a comet nucleus as an aggregate of interstellar dust is used to provide comparisons with comet Halley results: the density of the nucleus and of the dust; the dust cloud model and its consequences on the production of C(+) and CN in the coma by small organic grains; the surface albedo and the nucleus heat conductivity and high surface temperature; the appearance of 10 to the minus 14th to minus 17th power g dust particles along with higher masses; the mass spectra of dust and infrared spectroscopy as evidence for complex organic grain mantles (0.15 microns) and of very small (0.01 micron) carbonaceous and silicate grains; and the appearance of small grains resulting from breakup of larger grains. The cosmic ray dosage of a comet nucleus during its 4 1/2 billion yr in the Oort cloud appears to be many orders of magnitude less than the dosage of the pre-aggregated interstellar dust by ultraviolet photons except perhaps in the outer few meters of the nucleus of a new comet. It is shown that solar heating of the interior of a nucleus is lower than previously estimated.
Greenberg Mayo J.
Grim Ruud
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