Results of infrared spectrometer experiment. 2: Infrared radiometry of nucleus of Halley's Comet

Details Results of infrared spectrometer experiment. 2: Infrared radiometry of nucleus of Halley's Comet Results of infrared spectrometer experiment. 2: Infrared radiometry of nucleus of Halley's Comet

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988rpsct...5...19n&link_type=abstract

In its JPRS Report: Science and Technology. USSR: Space p 19 (SEE N88-20312 13-12) Transl. into ENGLISH from Kosmicheskiye Issle

Physics

Comet Nuclei, Halley'S Comet, Infrared Spectroscopy, Vega Project, Brightness Temperature, Ice, Porosity, Spacecraft Instruments, Stratification

Scientific paper

The IR radiometry of the nucleus of Halley's Comet is discussed. Since the data processing is still continuing, the results obtained as of May 1987 are given. The experiment was carried out only on the Vega 1. The infrared spectrometer was mounted on the platform, which by means of a TV system directed the optical instruments on the center of cometary brightness. It was assumed that the brightness coincided with the nucleus. The color temperature was T equals 420 plus or minus 60 K. It was found that the brightness temperature at the hottest points of the nucleus is close to the color temperature. It was found that there is little or no ice at the surface of the nucleus. The ice is covered by a thin layer of dark matter having a low thermal conductivity and a considerable degree of porosity, making it possible for water vapor to diffuse through it. Real proof of the presence of a dark mantle was obtained for the first time in the Vega observations.

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