Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..260g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 260-274.
Astronomy and Astrophysics
Astrophysics
186
Cosmic Dust, Emission Spectra, Halley'S Comet, Infrared Spectra, Interstellar Matter, Silicates, Comet Nuclei, Planetary Evolution, Radiative Transfer
Scientific paper
The interstellar dust model of comets is numerically worked out to satisfy simultaneously several basic constraints provided by observations of Comet Halley, and to derive the porosity of coma dust. The observational constraints are (1) the strengths of the 3.4 and 9.7 micron emission bands, (2) the shape of the 9.7 micron band, (3) the amount of silicates relative to organic materials, and (4) the mass distribution of the dust. The method used involves precise calculations of temperatures and the emission characteristics of porous aggregates of interstellar dust as a function of their mass, porosity, and distance to the sun and the wavelength. The results indicate that coma dust has a porosity in the range 0.93-0.975, i.e., a packing factor of 0.07 or less, consistent with independent observations of comet densities of 0.6 to 0.26 g/cu cm and meteor densities of less than 0.2 g/cu cm.
Greenberg Mayo J.
Hage Joniek I.
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