Near-Infrared Coma Colors of Comet Hale-Bopp

Details Near-Infrared Coma Colors of Comet Hale-Bopp Near-Infrared Coma Colors of Comet Hale-Bopp

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0908b&link_type=abstract

American Astronomical Society, DPS meeting #28, #09.08; Bulletin of the American Astronomical Society, Vol. 28, p.1089

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Near-infrared images of Comet Hale-Bopp were obtained on 1996 April 27, 28 and 29 UT with a NICMOS III at the University of Arizona 2.3-meter Bok telescope. We used the standard J and H (1.25 and 1.63 microns respectively) bandpasses, and the "short" Ks (2.16 microns) bandpass. At the time of these observations the comet was approximately 4.6 AU from the Sun and 4.2 AU from the Earth, at a phase angle of -12 degrees. At these wavelengths the observed flux is dominated by scattering from dust particles. The images reveal clear structure in the distribution of the coma colors, with the bluest region located near but not coincident with the photocenter, as reported by other observers (e.g., Fomenkova et al. ACM 96). We are in the process of analyzing these observations. Preliminary results show the color gradient is similar to that observed in the coma of Comet Halley at these wavelengths by Campins, Rieke and Rieke 1989 (Icarus vol. 78, p54.)

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