Physics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ioch.rept..147g&link_type=abstract
In NASA, Washington, Infrared Observations of Comets Halley and Wilson and Properties of the Grains p 147-149 (SEE N89-13330 04-
Physics
1
Comet Nuclei, Cosmic Dust, Halley'S Comet, Spectrophotometry, Continuums, Emission Spectra, Grain Size, Gratings (Spectra), Spectrum Analysis
Scientific paper
Observations of Comet Halley with a grating spectrometer on board the Kuiper Airborne Observatory on four nights in Dec. 1985 to Apr. 1986 are reported. Low resolution 20 to 65 micrometer spectra of the nucleus with a 40 arcsec FWHM beam was obtained on 17 Dec. 1985, and on 15 and 17 Apr. 1986. On 20 Dec. 1985, only a 20 to 35 micrometer spectrum was obtained. Most of the data have been discussed in a paper where the continuum was dealt with. In that paper, models were fit to the continuum that showed that more micron sized particles of grain similar to amorphous carbon were needed to fit the spectrum than were allowed by the Vega SP-2 mass distribution, or that a fraction of the grains had to be made out of a material whose absorption efficiency fell steeper than lambda-1 for lambda greater than 20 micrometers. Spectra was also presented taken at several points on the coma on 15 Apr. which showed that the overall shape to the spectrum is the same in the coma. Tabulated values of the data and calibration curves are available. The spectral features are discussed.
Campins Humberto C.
Glaccum William
Loewenstein Robert F.
Moseley Samuel Harvey
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