Visibility of Halley's nucleus from the Giotto spacecraft

Statistics – Computation

Scientific paper

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Comet Nuclei, Giotto Mission, Halley'S Comet, Visibility, Albedo, Luminous Intensity, Modulation Transfer Function, Optical Thickness, Comets, Halley, Comet Nuclei, Giotto Mission, Spacecraft Observations, Optical Properties, Thickness, Calculations, Patterns, Comae, Dust, Models, Visible Light, Intensity, Atmosphere

Scientific paper

An effort is made to estimate the visibility of the patterns on the nucleus of Comet Halley from the Giotto spacecraft through the comet's dusty coma. The visibility computation is based on the theory of contrast reduction by a scattering and absorbing medium (a planetary atmosphere). It is shown that some details may be seen on the surface of the cometary nucleus even for an optical thickness as high as 2. It is noted that the surprisingly large apparent contrast for such large optical thicknesses can be explained by the strong forward scattering by the dust.

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