Near-Infrared Imaging Spectrophotometry Of Comet C/1995 O1 (Hale-Bopp) Near Perihelion |
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Authors: | Harker David E Woodward Charles E McMURTRY Craig W Goetz J A Pipher J L Forrest W J |
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Institution: | (1) Wyoming Infrared Observatory, Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071-3905, USA;(2) Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA |
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Abstract: | We present 1- to 5-μm broadband and CVF images of comet Hale-Bopp taken 1997 February 10.5 UT, 50 days before perihelion.
All the images exhibit a nonspherical coma with a bright “ridge” in the direction of the dust tail approximately 10″ from
the coma. Synthetic aperture spectrophotometry implies that the optically important grains are of a radius ≤0.4 μm; smallest
radius for any comet seen to date. The variation of the integrated surface brightness with radial distance from the coma (ρ)
in all the images closely follows the “steady state” ρ−1 model for comet dust ablation (Gehrz and Ney, 1992). The near-infrared colors taken along the dust tail are not constant
implying the dust grain properties vary with coma distance.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Comet dust infrared spectra |
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