The spectrum of comet P/Halley from 3.0 to 4.0 microns

Details The spectrum of comet P/Halley from 3.0 to 4.0 microns The spectrum of comet P/Halley from 3.0 to 4.0 microns

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...184..329d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 184, no. 1-2, Oct. 1987, p. 329-332.

Astronomy and Astrophysics

Astronomy

33

Astronomical Spectroscopy, Halley'S Comet, Infrared Spectra, Molecular Spectra, Black Body Radiation, Emission Spectra, Hydrocarbons, Spectral Energy Distribution, Spectral Resolution, Comets, Halley, Spectroscopy, Spectra, Wavelengths, Astronomy, Infrared, Spectrophotometry, Emissions, Optical Properties, Symmetry, Hydrocarbons, Production Rates, Gases, Molecules, Formation, Source, Origin, Mixing, Earth-Based Observations, Telescope Methods, Carbonaceous Material

Scientific paper

Infrared observations of comet Halley have been obtained in the spectral range 3.0 - 4.0 μm, using a CVF spectrophotometer with a resolving power of 80. Observations carried out on 1986 March 28 show a number of emission features superimposed on a 300K blackbody continuum. The main feature is asymmetric and centered at 3.375 μm; another strong feature is seen at 3.5 μm. Observations made on 1985 Dec. 30 show no significant emission at 3.375 μm. The broad feature observed on March 28 is most likely due to the vibrational mode of the H-C bond in a large molecule. If the emission is due to gaseous hydrocarbon molecules, then their production rate is of the order of 1028s-1. The 3.5 μm feature, and possibly the weaker 3.58 μm feature could be due to H2CO, with a mixing ratio of a few percent with respect to H2O.

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