Comet C/2001 Q4 (NEAT)

Details Comet C/2001 Q4 (NEAT) Comet C/2001 Q4 (NEAT)

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iauc.8358....1c&link_type=abstract

IAU Circ., 8358, 1 (2004). Edited by Green, D. W. E.

Physics

2

Scientific paper

Further to IAUC 8351, W. J. Carpenter (University of Cincinnati), M. L. Sitko, R. W. Russell, and D. L. Kim report additional 3-13-micron spectrophotometry of C/2001 Q4, obtained on June 17.2 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 305 +/- 5 K was fit to the continuum flux at 5, 8.4, and 12 microns. This grain temperature is about 16 +/- 2 percent higher than that of an equilibrium blackbody at the heliocentric distance of the comet. The silicate-feature-to-continuum ratio was about 1.26 +/- 0.02 -- lower than the values of 1.65 reported on May 14.2 (IAUC 8342) and 1.43 reported for May 31.2 (IAUC 8351). During the period of observation, the strength of the silicate feature above the continuum was unchanged. The crystalline olivine feature at 11.2 microns continues to be present with approximately the same contrast as orginally seen. With our aperture, the comet has the following narrowband (about 0.25 micron) magnitudes and combined random errors: [3.7 microns] = 7.75 +0.45/-0.33, [4.7 microns] = 5.68 +0.20/-0.17, [5 microns] = 5.61 +0.23/-0.18, [8 microns] = 1.96 +/- 0.10, [10.5 microns] = 0.43 +/- 0.03, [12 microns] = 0.15 +/- 0.02."

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