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Start Over Author "Soderblom, Jason M." Journal icarus
12 results on '"Soderblom, Jason M."'

10. Martian phase function: Modeling the visible to near-infrared surface photometric function using HST-WFPC2 data

Author

Soderblom, Jason M., Bell, James F., Hubbard, Min Y.H., and Wolff, Michael J.

Subjects
Hubble Space Telescope (Artificial satellite), Mars (Planet) -- Properties, Mars (Planet) -- Models, Photometry -- Methods, Image processing -- Methods, Astronomy, Earth sciences
Abstract

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.icarus.2006.05.006 Byline: Jason M. Soderblom (a), James F. Bell (a), Min Y.H. Hubbard (a), Michael J. Wolff (b) Keywords: Mars; surface; Photometry; Spectrophotometry Abstract: Images of Mars in the visible to near-infrared acquired from 1996 to 2005 using the Hubble Space Telescope WFPC2 have been used to model the martian surface photometric function at 502, 673, 953, and 1042 nm. These data range in spatial resolution from 12 to 70 km/pixel at the sub-Earth point, and in phase angle coverage from 0.34[degrees] to 40.5[degrees]. The WFPC2 images have been calibrated to radiance factor or I/F and projected to a cylindrical map for coregistration and comparison to similarly mapped spacecraft data sets of albedo, topography, thermal inertia, composition, and geology. We modeled the observed I/F as a function of phase angle using Minnaert, Lambert, lunar-Lambert, and Hapke photometric functions for numerous regions of interest binned into albedo units defined by Viking and TES albedo maps, and thermal-inertia units defined by TES thermal-inertia maps. Visibly opaque water-ice clouds and data acquired under high dust opacity conditions were excluded from the analysis. Our modeling suggests that under average to low atmospheric dust opacity conditions and over this range of phase angles, the photometric properties of the martian surface at 502, 673, 953, and 1042 nm are best modeled by lunar-Lambert functions with parameters derived for three surface units defined by low, moderate, and high TES bolometric albedos. Author Affiliation: (a) Department of Astronomy, Cornell University, Ithaca, NY 14853-6801, USA (b) Space Science Institute, 1540 30th Street, Suite 23, Boulder, CO 80303-1012, USA Article History: Received 31 August 2005; Revised 25 April 2006

Published
2006

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