Other
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iauc.8361....2r&link_type=abstract
IAU Circ., 8361, 2 (2004). Edited by Green, D. W. E.
Other
1
Scientific paper
Further to IAUC 8358, R. W. Russell, D. L. Kim, M. L. Sitko, and W. J. Carpenter report 3-13-micron spectrophotometry of comet C/2003 K4, obtained on June 20.3 UT at Mt. Lemmon (integration times 90 min on the comet; reference star alpha Boo): "A continuum, smooth to within the signal-to-noise, was seen to rise from 3.5 to 8 microns, beyond which a weak silicate emission band may have been observed. An underlying blackbody continuum with a temperature of about 235 +/- 10 K was fit to the continuum fluxes at 8.4 and 12 microns. This grain temperature is about 22 +/- 5 percent higher than that of an equilibrium blackbody at the comet's heliocentric distance. Using the same wavelength region (10.34-10.71 microns) as for other, brighter comets in order to calculate a silicate- feature-to-continuum ratio, the possible silicate feature was about 1.10 +/- 0.05 times higher than the continuum, with the silicate- feature-to-continuum ratio > 1. The comet showed the following narrowband (about 0.25 micron) magnitudes and combined random errors: [8.0 microns] = 4.25 +/- 0.10; [10.5 microns] = 2.41 +/- 0.06; [12 microns] = 1.76 +/- 0.06. Due to the low flux level of the comet and the weakness of its silicate feature, no structure due to crystalline material was discernible."
Carpenter Jack W.
Kim Daryl L.
Russell Ray W.
Sitko Michael L.
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