TV experiment of the Vega mission: Photometry of the nucleus and the inner coma

Physics

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Comet Nuclei, Halley'S Comet, Satellite Television, Spectrophotometry, Vega Project, Albedo, Cosmic Dust, Morphology, Optical Thickness

Scientific paper

Vega photometry of comet Halley's nucleus reveals albedo = 0.04 wavelength independent in the range 0.5 to 0.9 microns. Dust production on the surface has strong horizontal inhomogeneities, with jets of different intensities and relatively transparent fields. Vertical optical thickness of dust is less than 0.1 outside the strongest jets. Part of the visible surface radiance inhomogeneities can be connected with the real surface structure (morphology and albedo differences). The angle dependence of radiance is like that for the Moon surface. Dust coma between 100 and 1000 km looks like a broad sunward oriented cone. There are differences in the structure of the features between images obtained by 2 probes with the time interval (72 hr).

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