Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.121c&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 121-124 (SEE N
Physics
1
Cosmic Dust, Halley'S Comet, Infrared Spectra, Spectrophotometry, Airborne Equipment, Color, Particle Size Distribution, Silicates, Space Observations (From Earth), Vega Project
Scientific paper
Spectrophotometry from 5 to 9 microns (Δλ/λ ≡ 0.02) of comet Halley was obtained from the Kuiper Airborne Observatory in 1985 December 12.1 and 1986 April 8.6 and 10.5 UT. The December observations are the first ever made of a comet in this spectral region. Two spectral features are apparent in all the observations, one from 5.24 to 5.6 μm and the silicate emission feature which has an onset between 7 and 8 microns. There is no evidence for the 7.5 μm feature observed by the Vega 1 spacecraft; the large difference between the areal coverage viewed from the spacecraft and the airplane may explain the discrepancy. Color temperatures significantly higher than a blackbody indicate that small particles are abundant in the coma. Significant spatial and temporal variations in the spectrum were observed and show trends similar to those observed from the ground.
Allamandola Louis J.
Bregman Jesse D.
Campins Humberto
Cohen Martin
Rank David M.
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