Infrared photometry of Comet P/Halley pre- and post-perihelion

Details Infrared photometry of Comet P/Halley pre- and post-perihelion Infrared photometry of Comet P/Halley pre- and post-perihelion

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...205..301d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 205, no. 1-2, Oct. 1988, p. 301-308. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

2

Brightness Temperature, Halley'S Comet, Infrared Photometry, Magnitude, Cometary Atmospheres, Least Squares Method, Light Curve, Spatial Distribution, Temporal Distribution

Scientific paper

Infrared photometry of comet P/Halley is presented over a period ranging from September 1985 to June 1986, pre- and post-perihelion. The behavior of the infrared magnitude as a function of the heliocentric distance is globally similar to the one of the visual magnitude. Short-term variations are observed in the intervals Dec. 25, 1985 - Jan. 3, 1986 and Feb. 17 - March 3, 1986. When the comet is in a quiescent state, the infrared flux increases linearly with the diaphragm size, which implies a dust expansion at constant velocity up to a distance to the nucleus of at least 10,000 km. The temperature measured in April 1986 ranges between 250 and 300K, in reasonable agreement with the expected equilibrium temperature of the grains.

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