The spectral appearance of comets from 5 to 20 micrometers: A survey of the data

Details The spectral appearance of comets from 5 to 20 micrometers: A survey of the data The spectral appearance of comets from 5 to 20 micrometers: A survey of the data

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ioch.rept..129b&link_type=abstract

In NASA, Washington, Infrared Observations of Comets Halley and Wilson and Properties of the Grains p 129-133 (SEE N89-13330 04-

Other

Cometary Atmospheres, Emission Spectra, Infrared Spectra, Thermal Emission, Astronomical Photometry, Filter Wheel Infrared Spectrometers, Gratings (Spectra), Spectrum Analysis

Scientific paper

Based on the concept of comets as being conglomerates of rocks and ices, it is expected that they reflect these components in their emission spectra. Silicate materials (rocks) are common in many astronomical environments and show prominent features at about 10 and 18 micrometers. Carbon should be abundant, but is much more difficult to detect spectroscopically since it has no strong features (except for the hydrogenated form). Ices are present in comets, but they are difficult to detect since they are volatile enough to dissipate when the comet is bright enough to be easily observed in the IR, with present equipment. There are other materials present in comets, but the ones listed above should be the most common and thus dominate the thermal IR spectrum. Most of the IR observations made on comets between 5 and 20 micrometers are summarized. They fall into three broad categories: (1) filter photometry; (2) circular variable filter wheel spectroscopy; and (3) spectra obtained with multidetector grating spectrometers.

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