On the visibility of nuclei of dusty comets

Details On the visibility of nuclei of dusty comets On the visibility of nuclei of dusty comets

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...47..325h&link_type=abstract

(International Astronomical Union and American Astronomical Society, Colloquium on Comets: Gases, Ices, Grains, and Plasma, 61st

Astronomy and Astrophysics

Astronomy

14

Comet Nuclei, Halley'S Comet, Interplanetary Dust, Solar Radiation, Visibility, Albedo, Gas Dynamics, Optical Thickness, Particle Size Distribution, Comets, Comet Nuclei, Dust, Scattering, Grains, Radiation, Features, Reflectance, Surface, Intensity, Distribution, Distance, Solar Radiation, Halley Comet, Gases, Interactions, Models, Depth, Optical Properties, Parameters, Albedo, Flux

Scientific paper

The cometary nucleus visibility problem is discussed for the case of single scattering by dust grains, and it is found that the ratio of radiation scattered in the dust column above the surface, along with that reflected from the nucleus, determines the visibility of features on the nuclear surface. The visibility of the full nucleus against the dust foreground and background is described by a contrast parameter characterizing the ratio of radiation coming from the nuclear surface and that of the nuclear vicinity. Scattering calculations for the case of comet Halley at a heliocentric distance of 0.9 AU after perihelion are based on an isotropic dust distribution derived from hydrodynamic gas-dust interactions that result in a steep intensity increase just above the surface. For Newburn's nominal model of Halley, an optical depth of about 0.5 is found to impair the visibility of the nucleus.

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