Physics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iauc.8360....3r&link_type=abstract
IAU Circ., 8360, 3 (2004). Edited by Green, D. W. E.
Physics
Scientific paper
Further to IAUC 8358, R. W. Russell, D. L. Kim, M. L. Sitko, and W. J. Carpenter, report additional 3-13-micron spectrophotometry of C/2001 Q4, obtained on June 20.2 UT at Mt. Lemmon (integration time 45 min; reference star alpha Boo): "A smooth comet continuum was seen to rise from 3.5 to 8.4 microns, beyond which a moderate silicate emission band was observed. An underlying blackbody continuum with a temperature of about 315 +/- 5 K was fit to the continuum flux at 5, 8.4, and 12 microns. This grain temperature is about 21 +/- 2 percent higher than that of an equilibrium blackbody at the heliocentric distance of the comet. The silicate-feature-to-continuum ratio was 1.32 +/- 0.02 -- slightly greater than the value of 1.26 reported on June 17.2 (IAUC 8358), but still significantly less than that reported on May 31.2 (1.43; IAUC 8351) and May 14.2 (1.65; IAUC 8342). The crystalline olivine feature at 11.2 microns continues to be present with approximately the same contrast as originally seen. With our aperture, the comet has the following narrowband (about 0.25 micron) magnitudes and combined random errors: [3.7 microns] = 7.73 +/- 0.17, [4.7 microns] = 5.49 +/- 0.20, [5 microns] = 4.95 +/- 0.23, [8 microns] = 2.10 +/- 0.18, [10.5 microns] = 0.50 +/- 0.05, [12 microns] = 0.26 +/- 0.04."
Carpenter Jack W.
Kim Daryl L.
Russell Ray W.
Sitko Michael L.
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