Infrared observations of Comet Austin (1990 V) by the COBE/Diffuse Infrared Background Experiment

Details Infrared observations of Comet Austin (1990 V) by the COBE/Diffuse Infrared Background Experiment Infrared observations of Comet Austin (1990 V) by the COBE/Diffuse Infrared Background Experiment

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432l..71l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 432, no. 1, p L71-L74

Astronomy and Astrophysics

Astronomy

10

Austin Comet, Comet Tails, Dust, Infrared Imagery, Infrared Spectra, Cosmic Background Explorer Satellite, Infrared Astronomy, Mass Distribution, Particle Mass

Scientific paper

Comet Austin was observed by the Cosmic Background Explorer (COBE)/Diffuse Infrared Background Experiment (DIRBE) with broadband photometry at 1-240 micrometers during the comet's close passage by Earth in 1990 May. A 6 deg long (6 x 106 km) dust tail was found at 12 and 25 micrometers, with detailed structure due to variations in particle properties and mass-loss rate. The spectrum of the central 42 x 42 sq arcmin pixel was found to agree with that of a graybody of temperature 309 +/- 5 K and optical depth 7.3 +/- 10-8. Comparison with IUE and ground-based obervations indicates that particles of radius greater than 20 micrometers predominate by surface area. A mass-loss rate of 510 (+510/-205) kg/s and a total tail mass of 7 +/- 2 x 1010 kg was found for a model dust tail composed of Mie spheres with a differential particle mass distribution dn/d log m approx. m-0.63 and 2:1 silicate:amorphous carbon composition by mass.

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