Photometric Modeling of a Cometary Nucleus: Taking Hapke Modeling to the Limit

Details Photometric Modeling of a Cometary Nucleus: Taking Hapke Modeling to the Limit Photometric Modeling of a Cometary Nucleus: Taking Hapke Modeling to the Limit

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002assl..278....7b&link_type=abstract

Solar System Remote Sensing, p. 7

Astronomy and Astrophysics

Astronomy

Comet Nuclei, Astronomical Models, Spectral Reflectance, Quantitative Analysis, Planetary Surfaces, Particle Size Distribution, Albedo, Surface Roughness

Scientific paper

In 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.

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