Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.317s&link_type=abstract
The Exploration of Halley's Comet. Volume 2: Dust and Nucleus Proceedings of the 20th ESLAB Symposium held in Heidelberg, West G
Astronomy and Astrophysics
Astronomy
Scientific paper
The first TV images of the comet Halley were obtained 4 March, 1986 by 'Vega-1' and 7 March by 'Vega-2' and last was received 11 March. About 1500 images are in the collection of VEGA mission now, some of these were obtained on distances 8000 - 9000 km from the nucleus. First time the cometary nucleus was observed as a spatially resolved body. Calibration imaging of Jupiter was made before the encounter to provide possibilities of the absolute photometry. Albedo of nucleus ≡0.04 was found. Dust production on the surface has strong horizontal inhomogeneities, their jets of different intensities and relative transparent fields. Vertical optical thickness of dust is <0.1 outside the strongest jets. Some 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 the one found for the Moon surface. Dust coma on the distances between 100 and 1000 km looks as broad sunward oriented cone.
Avanesov G. A.
Moroz Vasiliy Ivanovich
Sagdeev Roal'd. Z.
Shamis V. A.
Smith Brett
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