Other
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..101...64h&link_type=abstract
Icarus (ISSN 0019-1035), vol. 101, no. 1, p. 64-70.
Other
17
Austin Comet, Dust, Emission Spectra, Infrared Photometry, Infrared Spectroscopy, Mineralogy, Silicates, Comets, Austin, Spectroscopy, Photometry, Infrared, Wavelengths, Dust, Earth-Based Observations, Emissions, Composition, Mineralogy, Silicates, Comparisons, Magnitude, Spectra
Scientific paper
3-micron and 10-micron spectra and IR photometry of the dynamically new Comet Austin 1990 V were obtained for March-May 1990. An unusual 9-11 micron emission feature 15-20 percent above the continuum is evident at 0.78 AU postperihelion. The shape, in particular a peak at 11.06 micron, differs from that seen in Halley and several other comets, suggesting a difference in the mineralogy of the silicate grains. The 3.1-7.7 micron spectrum at 0.35 AU shows no obvious feature; feature/continuum contrast of the 3.36 micron emission feature is less than about 5 percent. Based on the IR photometry and a dust model weighted toward small grains, the dust production rate on 6 May at 0.78 AU was about 3 x 10 exp 5 g/s. The corresponding dust/gas mass ratio was about 0.1, classifying Austin as a dust-poor comet. This designation refers only to the relative dust cross section, not to the total mass.
Brooke Timothy Young
Hanner Martha S.
Lynch David K.
Russell Ray W.
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