Airborne spectrophotometry of P/Halley from 16 to 30 microns
We report on the first medium resolution spectrophotometric observations of a comet ever obtained in the 16- to 30-μm region. Comet P/Halley was observed using the Cornell University 7-channel spectrometer (Δλ/λ ~ 0.02 on board the Kuiper Airborne Observatory on 1985 December 14.2. Measurements were made centered on the nuclear condensation. These observations show a complex spectrum which could not be fit with simple models. The 20 μm silicate feature, if present, is very weak; and a relatively narrow (Δλ ~ 0.5 μm), strong feature centered at approximately 28.4 μm is observed and attributed to dust emission.
Key wordsairborne infrared dust
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