Infrared monitoring of Halley's Comet

Details Infrared monitoring of Halley's Comet Infrared monitoring of Halley's Comet

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.365s&link_type=abstract

In ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters p 365-369 (SEE N87-26714

Astronomy and Astrophysics

Astronomy

Astronomical Photometry, Cosmic Dust, Halley'S Comet, Infrared Photometry, Infrared Spectra, Cometary Atmospheres, Continuous Spectra, Electron Energy, Energy Distribution, Light Scattering, Silicates, Space Observations (From Earth)

Scientific paper

Multiaperture photometry at 1 to 5 microns was obtained during 12 nights in the preperihelion phase of Halley's comet and during 4 nights in the postperihelion phase. In addition, 10 and 20 micron photometry was obtained on 3 November, when the comet was at 1.88 AU from the Sun. An analysis of JHK data indicates that Halley is typically redder than the Sun ((J-H)=0.54, (H-K)=0.17) and variable. Except for 4 November and 21 March, the multiaperture data is consistent with r to the minus 2 density distribution of scattering dust in the coma. The 10 micron silicate feature in emission is detected on 3 Nov. but the 8 to 20 micron energy distribution of the comet on that day cannot be fitted by dust at a single temperature if silicate dust is assumed.

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