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Comparison of USGS and DLR topographic models of Comet Borrelly and photometric applications

Kirk, R. L. and Howington-Kraus, E. and Soderblom, L. A. and Giese, B. and Oberst, J. (2004) Comparison of USGS and DLR topographic models of Comet Borrelly and photometric applications. Icarus, 167 (1), pp. 54-69. Elsevier. doi: 10.1016/j.icarus.2003.07.009. ISSN 0019-1035.

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Stereo analysis of images obtained during the 2001 flyby of Comet Borrelly by NASA's Deep Space 1 (DS1) probe allows us to quantify the shape and photometric behavior of the nucleus. The shape is complex, with planar facets corresponding to the dark, mottled regions of the surface whereas the bright, smooth regions are convexly curved. The photometric as well as textural differences between these regions can be explained in terms of topography (roughness) at and below the image resolution, without invoking significant variations in single-particle properties; the material on Borrelly's surface could be quite uniform. A statistical comparison of the digital elevation models (DEMs) produced from the three highest-resolution images independently at the USGS and DLR shows that their difference standard deviation is 120 m, consistent with a matching error of 0.20 pixel (similar to reported matching accuracies for many other stereo datasets). The DEMs also show some systematic differences attributable to manual versus automatic matching. Disk-resolved photometric modeling of the nucleus using the DEM shows that bright, smooth terrains on Borrelly are similar in roughness (Hapke roughness straight theta, small theta, Greek=20°) to C-type asteroid Mathilde but slightly brighter and more backscattering (single-scattering albedo w=0.056, Henyey–Greenstein phase parameter g=-0.32). The dark, mottled terrain is photometrically consistent with the same particles but with roughnesses as large as 60°. Intrinsically darker material is inconsistent with the phase behavior of these regions. Many local radiance variations are clearly related to topography, and others are consistent with a topographic explanation; one need not invoke albedo variations greater than a few tens of percent to explain the appearance of Borrelly.

Item URL in elib:https://elib.dlr.de/10908/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:Comparison of USGS and DLR topographic models of Comet Borrelly and photometric applications
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kirk, R. L.United States Geological Survey, Flagstaff, AZUNSPECIFIEDUNSPECIFIED
Howington-Kraus, E.United States Geological Survey, Flagstaff, AZUNSPECIFIEDUNSPECIFIED
Soderblom, L. A.United States Geological Survey, Flagstaff, AZUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 54-69
Keywords:Borrelly, small bodies, topography, photogrammetry, photometry
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: DLR-Beauftragter, elib
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 16:29

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