Comet Halley - Spatial and temporal variability of the silicate emission feature

Details Comet Halley - Spatial and temporal variability of the silicate emission feature Comet Halley - Spatial and temporal variability of the silicate emission feature

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..695r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, Feb. 1991, p. 695-705.

Astronomy and Astrophysics

Astronomy

9

Emission Spectra, Halley'S Comet, Silicates, Variability, Astronomical Photometry, Astronomical Spectroscopy, Brightness Distribution, Infrared Telescopes, Interplanetary Dust, Thermal Emission, Comets, Halley, Silicate, Emissions, Photometry, Astronomy, Comae, Wavelengths, Earth-Based Observations, Infrared, Brightness, Timescale, Temperature, Dust, Parameters, Spectra, Distance

Scientific paper

Narrow- and broadband photometry of Comet Halley covering the wavelength range 2-20 microns was obtained at the NASA Infrared Telescope Facility (IRTF) both preperihelion (UT 1986 January 17 and 18) and postperihelion (UT 1986 March 3-5). Strong features at 10 and 20 microns, indicative of silicate emission, were evident in the data. In addition to day-to-day variations in brightness at all wavelengths, changes were observed in the strength of the silicate emission feature on timescales as short as 3 hr. While the strength of the 10-micron feature varied with location in the coma, no such variability was observed in the shape of this emission feature, in agreement with higher spectral resolution observations (Campins and Ryan, 1989). Calculated color temperatures indicate that brightness and temperature do not correlate directly, i.e., brighter did not necessarily imply hotter dust grains. These observations are used to refine a relation between the color temperature of the dust and the heliocentric distance derived by Tokunaga et al. (1988).

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