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The nucleus of Comet Borrelly: a study of morphology and surface brightness

Oberst, J. and Giese, B. and Howington-Kraus, E. and Kirk, R. and Soderblom, L. and Buratti, C. and Hicks, M. and Nelson, R. and Britt, D. (2004) The nucleus of Comet Borrelly: a study of morphology and surface brightness. Icarus: International Journal of Solar System Studies, 167 (1), pp. 70-79. Elsevier. DOI: 10.1016/j.icarus.2003.05.001 ISSN 0019-1035

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Abstract

Stereo images obtained during the DS1 flyby were analyzed to derive a topographic model for the nucleus of Comet 19P/Borrelly for morphologic and photometric studies. The elongated nucleus has an overall concave shape, resembling a peanut, with the lower end tilted towards the camera. The bimodal character of surface-slopes and curvatures support the idea that the nucleus is a gravitational aggregate, consisting of two fragments in contact. Our photometric modeling suggests that topographic shading effects on Borrelly's surface are very minor (<10%) at the given resolution of the terrain model. Instead, albedo effects are thought to dominate Borrelly's large variations in surface brightness. With 90% of the visible surface having single scattering albedos between 0.008 and 0.024, Borrelly is confirmed to be among the darkest of the known Solar System objects. Photometrically corrected images emphasize that the nucleus has distinct, contiguous terrains covered with either bright or dark, smooth or mottled materials. Also, mapping of the changes in surface brightness with phase angle suggests that terrain roughness at subpixel scale is not uniform over the nucleus. High surface roughness is noted in particular near the transition between the upper and lower end of the nucleus, as well as near the presumed source region of Borrelly's main jets. Borrelly's surface is complex and characterized by distinct types of materials that have different compositional and/or physical properties.

Item URL in elib:https://elib.dlr.de/10904/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:The nucleus of Comet Borrelly: a study of morphology and surface brightness
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Oberst, J.UNSPECIFIEDUNSPECIFIED
Giese, B.UNSPECIFIEDUNSPECIFIED
Howington-Kraus, E.United States Geological Survey, Flagstaff, AZUNSPECIFIED
Kirk, R.United States Geological Survey, Flagstaff, AZUNSPECIFIED
Soderblom, L.United States Geological Survey, Flagstaff, AZUNSPECIFIED
Buratti, C.Jet Propulsion Laboratory, Pasadena, CAUNSPECIFIED
Hicks, M.Jet Propulsion Laboratory, Pasadena, CAUNSPECIFIED
Nelson, R.Jet Propulsion Laboratory, Pasadena, CAUNSPECIFIED
Britt, D.Department of Physics, The University of Central Florida, Orlando, USAUNSPECIFIED
Date:2004
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:167
DOI :10.1016/j.icarus.2003.05.001
Page Range:pp. 70-79
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:comets, nucleus, surfaces, topography, morphology, 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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