Optical image of a cometary nucleus: 1980 flyby of Comet Encke

Physics

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Comet Nuclei, Flyby Missions, Imaging Techniques, Astronomical Models, Brightness, Cosmic Dust, Electromagnetic Radiation, Mie Scattering, Onboard Equipment, Space Debris

Scientific paper

The feasibility was investigated of obtaining optical images of a cometary nucleus via a flyby of Comet Encke. A physical model of the dust cloud surrounding the nucleus was developed by using available physical data and theoretical knowledge of cometary physics. Using this model and a Mie scattering code, calculations were made of the absolute surface brightness of the dust in the line of sight of the on-board camera and the relative surface brightness of the dust compared to the nucleus. The brightness was calculated as a function of heliocentric distance and for different phase angles (sun-comet-spacecraft angle).

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