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Photometric Modeling of a Cometary Nucleus: Taking Hapke Modeling to the LimitIn the past two decades, photometric models developed by Bruce Hapke have been fit to a wide range of bodies in the Solar System: The Moon, Mercury, several asteroids, and many icy and rocky satellites. These models have enabled comparative descriptions of the physical attributes of planetary surfaces, including macroscopic roughness, particle size and size-distribution, the single scattering albedo, and the compaction state of the optically active portion of the regolith. One challenging type of body to observe and model, a cometary nucleus, awaited the first space based mission to obtain images unobscured by coma. The NASA-JPL Deep Space 1 Mission (DS1) encountered the short-period Jupiter-family comet 19/P Borrelly on September 22, 2001, about 8 days after perihelion. Prior to its closest approach of 2171 km, the remote-sensing package on the spacecraft obtained 25 CCD images of the comet, representing the first closeup, unobscured view of a comet's nucleus. At closest approach, corresponding to a resolution of 47 meters per pixel, the intensity of the coma was less than 1% of that of the nucleus. An unprecedented range of high solar phase angles (52-89 degrees), viewing geometries that are in general attainable only when a comet is active, enabled the first quantitative and disk-resolved modeling of surface photometric physical parameters.
Document ID
Document Type
Conference Paper
Buratti, B. J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Hicks, M. D. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Soderblom, L. (Geological Survey Flagstaff, AZ United States)
Hillier, J. (Grays Harbor Community Coll. WA United States)
Britt, D. (Tennessee Univ. United States)
Date Acquired
August 20, 2013
Publication Date
January 1, 2002
Publication Information
Publication: Solar System Remote Sensing
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

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