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Lineaments on the Surface of the Consolidated Material of the Comet 67P/Churyumov−Gerasimenko Nucleus

Basilevsky, A.T. and Skorov, Y. and Hviid, S. and Krasilnikov, S.S. and Mall, U. and Keller, H. U. (2018) Lineaments on the Surface of the Consolidated Material of the Comet 67P/Churyumov−Gerasimenko Nucleus. Solar System Research, 52 (6), pp. 505-517. Springer. doi: 10.1134/S0038094618060011. ISSN 0038-0946.

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orphologic analysis of the fragments (500 × 500 pixels) of images of comet 67P/Churyumov−Gerasimenko obtained with the OSIRIS camera for 18 regions, where the consolidated material is exposed on the surface, has been carried out. In terms of resolution, the images form a series from 0.04 to 1.29 m/pixel; consequently, the areas covered by these fragments vary from 400 to ~400 000 m2. In all of the regions, lineaments resembling tension fractures—several dozens of structures per region—are seen; and their number scarcely changes when passing from high-resolution images to lower-resolution ones. It is clear that relatively small lineaments cease to be reliably distinguished when the image resolution worsens, but the largest and well-defined ones remain observable, while the number of larger lineaments grows proportionally to the survey area increasing. Undoubtedly, this is an observational effect, which was demonstrated by examples with an artificially worsened resolution. However, on the other hand, this means that the tension fractures of the consolidated nucleus material represent a hierarchic population of smaller (meters long) to larger (decameters and longer) features. The lineaments seen in the analyzed fragments of images were counted, their lengths were measured, and the spacings (the mean distances between lineaments) and, from them, the depths of penetration of fractures into the nucleus material were estimated. It has been shown that the mean length of lineaments within each studied region depend s on its area (which here correlates with the image resolution) and the depths of fracture penetration into the nucleus body depends on the mean length of lineaments. Both dependences are close to a power law. In the images of four regions covering the areas from 100 000 to 400 000 m2 with a resolution of 0.66−1.29 m/pixel, the structures that look like layering or sheet jointing are seen in addition to fracture lineaments. The tension fractures are apparently formed due to seasonal and diurnal variations of the temperature, while the nature of the formation of the layer-like structures is not yet fully understood.

Item URL in elib:https://elib.dlr.de/124696/
Document Type:Article
Title:Lineaments on the Surface of the Consolidated Material of the Comet 67P/Churyumov−Gerasimenko Nucleus
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Basilevsky, A.T.Vernadsky Institute for Geochemistry and Analytical Chemistry, RAS, Moscow, RussiaUNSPECIFIED
Skorov, Y.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 337077 Göttingen, GermanyUNSPECIFIED
Hviid, S.stubbe.hviid (at) dlr.deUNSPECIFIED
Krasilnikov, S.S.Vernadsky Institute of Geochemistry and Analytical Chemistry, RAS, Moscow, RussiaUNSPECIFIED
Mall, U.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Keller, H. U.horst.keller (at) dlr.deUNSPECIFIED
Journal or Publication Title:Solar System Research
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1134/S0038094618060011
Page Range:pp. 505-517
Keywords:Rosetta 67P Comets Lineaments, consolidated material, fracture, spacing, nucleus
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project ROSETTA Instruments
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Hviid, Stubbe
Deposited On:10 Dec 2018 14:22
Last Modified:06 Sep 2019 15:17

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