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Surface evolution of the Anhur region on comet 67P/Churyumov-Gerasimenko from high-resolution OSIRIS images

Fornasier, Sonia and Feller, Clement and Hasselmann, Pedro and Barucci, Maria A. and Sunshine, J.M. and Vincent, Jean-Baptiste and Shi, Xian and Sierks, Holger and Naletto, G. and Lamy, P. L. and Rodrigo, Rafael and Koschny, D. and Davidsson, Björn and Bertaux, Jean-Loup and Bertini, I. and Bodewits, D. and Cremonese, G. and Da Deppo, V. and Debei, S. and De Cecco, M. and Deller, Jakob and Ferrari, S. and Fulle, M. and Gutierrez, P. and Güttler, C. and Ip, W-H. and Jorda, L. and Keller, H. U. and Lara, M. L. and Lazzarin, M. and Lopez Moreno, J. J. and Lucchetti, A. and Marzari, F. and Mottola, S and Pajola, M. and Toth, I. and Tubiana, C. (2019) Surface evolution of the Anhur region on comet 67P/Churyumov-Gerasimenko from high-resolution OSIRIS images. Astronomy & Astrophysics, 630, A13. EDP Sciences. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/201834824

Abstract

Context. The southern hemisphere of comet 67P/Churyumov-Gerasimenko (67P) became observable by the Rosetta mission in March 2015, a few months before cometary southern vernal equinox. The Anhur region in the southern part of the comet’s larger lobe was found to be highly eroded, enriched in volatiles, and highly active. Aims. We analyze high-resolution images of the Anhur region pre- and post-perihelion acquired by the OSIRIS imaging system on board the Rosetta mission. The Narrow Angle Camera is particularly useful for studying the evolution in Anhur in terms of morphological changes and color variations. Methods. Radiance factor images processed by the OSIRIS pipeline were coregistered, reprojected onto the 3D shape model of the comet, and corrected for the illumination conditions. Results. We find a number of morphological changes in the Anhur region that are related to formation of new scarps; removal of dust coatings; localized resurfacing in some areas, including boulders displacements; and vanishing structures, which implies localized mass loss that we estimate to be higher than 50 million kg. The strongest changes took place in and nearby the Anhur canyon-like structure, where significant dust cover was removed, an entire structure vanished, and many boulders were rearranged. All such changes are potentially associated with one of the most intense outbursts registered by Rosetta during its observations, which occurred one day before perihelion passage. Moreover, in the niche at the foot of a new observed scarp, we also see evidence of water ice exposure that persisted for at least six months. The abundance of water ice, evaluated from a linear mixing model, is relatively high (>20%). Our results confirm that the Anhur region is volatile-rich and probably is the area on 67P with the most pristine exposures near perihelion.

Item URL in elib:https://elib.dlr.de/129398/
Document Type:Article
Title:Surface evolution of the Anhur region on comet 67P/Churyumov-Gerasimenko from high-resolution OSIRIS images
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fornasier, SoniaLESIA-Observatoire de Paris, CNRS, Université Pierre et Marie Curie, Universite Paris Diderot, 5 place Jules Janssen, 92195 Meudon, FranceUNSPECIFIED
Feller, ClementLESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIED
Hasselmann, PedroLESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIED
Barucci, Maria A.LESIA-Observatoire de Paris, CNRS, UPMC, Univ. Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195, Meudon Principal Cedex, France; Univ. Paris Diderot, Sorbonne Paris Cité, 4 rue Elsa Morante, 75205, Paris Cedex 13, FranceUNSPECIFIED
Sunshine, J.M.Department of Astronomy, University of Maryland, College Park, Maryland 20742, USAUNSPECIFIED
Vincent, Jean-BaptisteJean-Baptiste.Vincent (at) dlr.dehttps://orcid.org/0000-0001-6575-3079
Shi, Xianmax-planck-institut für sonnensystemforschung, justus-von-liebig-weg 3, 37077 göttingenUNSPECIFIED
Sierks, HolgerMax-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, GermanyUNSPECIFIED
Naletto, G.Department of Information Engineering, University of Padova, via Gradenigo 6/B, 35131, Padova, ItalyUNSPECIFIED
Lamy, P. L.Aix Marseille Université, CNRS LAM (Laboratoire d'Astrophysique de Marseille), UMR 7326, 13388, Marseille, FranceUNSPECIFIED
Rodrigo, RafaelInstituto de Astrofisica de Andalucia, CSIC, Granada, SpainUNSPECIFIED
Koschny, D.European Space Research and Technology Centre, European Space Agency, Keplerlaan 1, NL-2201 AZ Noordwijk, the NetherlandsUNSPECIFIED
Davidsson, Björnjpl, PasadenaUNSPECIFIED
Bertaux, Jean-LoupLATMOS, CNRS/UVSQ/IPSL, 11 boulevard d'Alembert, 78280, Guyancourt, FranceUNSPECIFIED
Bertini, I.Centro di Ateneo di Studi ed Attivitá Spaziali "Giuseppe Colombo" , University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Bodewits, D.Physics Department, Auburn University, Auburn, AL 36849, USAUNSPECIFIED
Cremonese, G.INAF/OAPD, Padova, ItalyUNSPECIFIED
Da Deppo, V.CNR-IFN UOS Padova LUXOR, ItalyUNSPECIFIED
Debei, S.Department of Mech. Engineering University of Padova, via Venezia 1, 35131 Padova, ItalyUNSPECIFIED
De Cecco, M.Università di Padova, Center of Studies and Activities of Space (CISAS) "G.Colombo", Padova, ItalyUNSPECIFIED
Deller, JakobMax-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3,UNSPECIFIED
Ferrari, S.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Fulle, M.INAF - Osservatorio Astronomico, Via Tiepolo 11, 34143, Trieste, ItalyUNSPECIFIED
Gutierrez, P.IAA-CSIC, Granada, SpainUNSPECIFIED
Güttler, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, GermanyUNSPECIFIED
Ip, W-H.Institute for Space Science, National Central University, Chung Li, TaiwanUNSPECIFIED
Jorda, L.Laboratoire d’Astrophysique de Marseille UMR 7326, CNRS & Aix Marseille Université, 13388 Marseille Cedex 13, FranceUNSPECIFIED
Keller, H. U.Institute for Geophysics and Extraterrestrial Physics, TU Braunschweig, 38106, GermanyUNSPECIFIED
Lara, M. L.Instituto de Astrofísica de Andalucía (CSIC), c/ Glorieta de la Astronomía s/n, 18008 Granada, Spain.UNSPECIFIED
Lazzarin, M.University of Padova, Department of Physics and Astronomy, vicolo dell’Osservatorio 3, 35122, Padova, ItalyUNSPECIFIED
Lopez Moreno, J. J.Instituto de Astrofisica de Andalucia-CSIC, Granada, SpainUNSPECIFIED
Lucchetti, A.Center of Studies and Activities for Space (CISAS) ‘G. Colombo’, Univer-UNSPECIFIED
Marzari, F.Dipartimento di Fisica e Astronomia “G. Galilei”, University of Padova, vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Mottola, Sstefano.mottola (at) dlr.dehttps://orcid.org/0000-0002-0457-3872
Pajola, M.CISAS - Center for Studies and Activities for Space, University of PadovaUNSPECIFIED
Toth, I.Observatory of the Hungarian Academy of Sciences, Budapest, HungaryUNSPECIFIED
Tubiana, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, GermanyUNSPECIFIED
Date:October 2019
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:630
Page Range:A13
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:comets, 67P/Churyumov-Gerasimenko, photometry, imaging spectroscopy
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 Instrumente
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Vincent, Jean-Baptiste
Deposited On:02 Dec 2019 13:25
Last Modified:02 Dec 2019 13:25

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