8- to 13-micron spectroscopy of Comet Levy 1990 XX

Details 8- to 13-micron spectroscopy of Comet Levy 1990 XX 8- to 13-micron spectroscopy of Comet Levy 1990 XX

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar..100..197l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 100, no. 1, p. 197-202.

Physics

28

Comets, Infrared Spectra, Infrared Spectroscopy, Space Infrared Telescope Facility, Black Body Radiation, Silicates

Scientific paper

The results are reported of IR spectroscopy of Comet Levy 1990 XX over a three-day period when the comet was about 1.54 AU from the sun roughly 70 days before perihelion. Comet Levy 1990 XX was bright, and for at least part of its inbound journey toward perihelion, active. At a distance of 1.54 AU from the sun it showed strong structured silicate emission with peaks or shoulders at 9.8 and 11.2 microns. These features resemble those of Comets P/Halley and Bradfield 1987 XXIX. The comet was variable in brightness. Specifically, the contrast of the silicate features changed by a factor of two relative to the continuum level and showed some evidence for a shape change as well.

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