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Close-up images of the final Philae landing site on comet 67P/Churyumov-Gerasimenko acquired by the ROLIS camera

Schröder, Stefan and Mottola, Stefano and Arnold, Gabriele and Grothues, H.-G. and Jaumann, R. and Keller, H. U. and Michaelis, Harald and Bibring, Jean-Pierre and Pelivan, Ivanka and Koncz, Alexander and Otto, Katharina A. and Remetean, E. and Souvannavong, F. and Dolives, B. (2016) Close-up images of the final Philae landing site on comet 67P/Churyumov-Gerasimenko acquired by the ROLIS camera. Icarus: International Journal of Solar System Studies, 285, pp. 263-274. Elsevier. DOI: 10.1016/j.icarus.2016.12.009 ISSN 0019-1035

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Official URL: http://www.sciencedirect.com/science/article/pii/S001910351630505X

Abstract

After coming to rest on the night side of comet 67P/Churyumov-Gerasimenko, the ROLIS camera on-board Rosetta’s Philae lander acquired five images of the surface below the lander, four of which were with the aid of LED illumination of different colors. The images confirm that Philae was perched on a sloped surface. A local horizon is visible in one corner of the image, beyond which we can see the coma. Having spent a full day on the surface Philae was commanded to lift and rotate, after which a final, sixth, LED image was acquired. The change in perspective allowed us to construct a shape model of the surface. The distance to the foreground was about 80 cm, much larger than the nominal 30 cm. This caused stray light, rather than directly reflected LED light, to dominate the image signal, complicating the analysis. The images show a lumpy surface with a roughness of apparently fractal nature. Its appearance is completely different from that of the first landing site, which was characterized by centimeter to meter-sized debris (Mottola et al., 2015). We recognize neither particles nor pores at the image resolution of 0.8 mm per pixel and large color variations are absent. The surface has a bi-modal brightness distribution that can be interpreted in terms of the degree of consolidation, a hypothesis that we support with experimental evidence. We propose the surface below the lander to consist of smooth, cracked plates with unconsolidated edges, similar to terrain seen in CIVA images.

Item URL in elib:https://elib.dlr.de/109444/
Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Close-up images of the final Philae landing site on comet 67P/Churyumov-Gerasimenko acquired by the ROLIS camera
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schröder, StefanStefanus.Schroeder (at) dlr.dehttps://orcid.org/0000-0003-0323-8324
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Grothues, H.-G.hg.grothues (at) dlr.deUNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Keller, H. U.igep tu braunschweigUNSPECIFIED
Michaelis, HaraldHarald.Michaelis (at) dlr.deUNSPECIFIED
Bibring, Jean-Pierreinstitut d'astrophysique spatialeUNSPECIFIED
Pelivan, IvankaIvanka.Pelivan (at) dlr.deUNSPECIFIED
Koncz, AlexanderAlexander.Koncz (at) dlr.deUNSPECIFIED
Otto, Katharina A.Katharina.Otto (at) dlr.dehttps://orcid.org/0000-0002-0675-1177
Remetean, E.centre national d'études spatiales, toulouse, franceUNSPECIFIED
Souvannavong, F.magellium, ramonville, saint-agne, franceUNSPECIFIED
Dolives, B.magellium, ramonville, saint-agne, franceUNSPECIFIED
Date:2016
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:285
DOI :10.1016/j.icarus.2016.12.009
Page Range:pp. 263-274
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Comet 67P/Churyumov-Gerasimenko; Comets; nucleus; Image processing; Photometry
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Lander
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Institute of Planetary Research > Planetary Geology
Institute of Planetary Research > Planetary Sensor Systems
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Schröder, Dr. Stefan
Deposited On:15 Dec 2016 09:41
Last Modified:31 Jul 2019 20:06

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