Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..402b&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, Apr. 1, 1979, p. 402-408.
Astronomy and Astrophysics
Astrophysics
60
Comet Nuclei, Ice Nuclei, Interplanetary Dust, Interplanetary Medium, Mass Distribution, Brightness, Mass Ratios, Perihelions, Size Determination, Dust, Mantle, Comets, Observations, Nuclei, Ice, Brightness, Models, Halley, Comet, Mass, Perihelion, Asymmetry, Water, Kohoutek, Mathematical Models
Scientific paper
A model of dust release and dust mantle development by cometary nuclei is developed to explain the brightness asymmetry observed in comets before and after perihelion. Assuming that the cometary nucleus consists of a uniform mixture of dust and volatile ices and taking into account the differential mass spectrum of the dust and the effect of nuclear gravity, it is shown that the factor which determines whether a comet will be brighter before or after perihelion is the mass ratio of dust to volatiles in the nucleus. If this ratio is greater than about two, the comet will be brighter on the inward path and not lose its mantle near perihelion. Applying the model to comet Halley (dust to volatiles ratio presumed to be less than two), it is predicted that the comet remains without a mantle until it reaches a heliocentric distance of 2.035 AU after perihelion and loses its mantle suddenly at a distance of about 1.45 AU on the inward path, causing it to be brighter after perihelion. Predictions of monochromatic brightness are found to be in fair agreement with total observed brightnesses.
Brin Glen David
Mendis Asoka D.
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