@article{8e9d72e20491418dbc80bac3f77fcbf0,
title = "Regional surface morphology of comet 67P/Churyumov-Gerasimenko from Rosetta/OSIRIS images: The southern hemisphere",
abstract = "Aims. The OSIRIS camera on board the Rosetta spacecraft has been acquiring images of the comet 67P/Churyumov-Gerasimenko (67P)'s nucleus since August 2014. Starting in May 2015, the southern hemisphere gradually became illuminated and was imaged for the first time. Here we present the regional morphology of the southern hemisphere, which serves as a companion to an earlier paper that presented the regional morphology of the northern hemisphere. Methods. We used OSIRIS images that were acquired at orbits ~45-125 km from the center of the comet (corresponding to spatial resolutions of ~0.8 to 2.3 m/pixel) coupled with the use of digital terrain models to define the different regions on the surface, and identify structural boundaries accurately. Results. Seven regions have been defined in the southern hemisphere bringing the total number of defined regions on the surface of the nucleus to 26. These classifications are mainly based on morphological and/or topographic boundaries. The southern hemisphere shows a remarkable dichotomy with its northern counterpart mainly because of the absence of wide-scale smooth terrains, dust coatings and large unambiguous depressions. As a result, the southern hemisphere closely resembles previously identified consolidated regions. An assessment of the overall morphology of comet 67P suggests that the comet's two lobes show surface heterogeneities manifested in different physical/mechanical characteristics, possibly extending to local (i.e., within a single region) scales.",
keywords = "Comets: general, Comets: individual: 67P/Churyumov-Gerasimenko, Methods: observational",
author = "El-Maarry, {M. R.} and N. Thomas and A. Gracia-Bern{\'a} and M. Pajola and Lee, {J. C.} and M. Massironi and B. Davidsson and S. Marchi and Keller, {H. U.} and Hviid, {S. F.} and S. Besse and H. Sierks and C. Barbieri and Lamy, {P. L.} and D. Koschny and H. Rickman and R. Rodrigo and A'Hearn, {M. F.} and Auger, {A. T.} and Barucci, {M. A.} and Bertaux, {J. L.} and I. Bertini and D. Bodewits and G. Cremonese and {Da Deppo}, V. and {De Cecco}, M. and S. Debei and C. G{\"u}ttler and S. Fornasier and M. Fulle and L. Giacomini and O. Groussin and Gutierrez, {P. J.} and Ip, {W. H.} and L. Jorda and J. Knollenberg and G. Kovacs and Kramm, {J. R.} and E. K{\"u}hrt and M. K{\"u}ppers and Lara, {L. M.} and M. Lazzarin and {Lopez Moreno}, {J. J.} and R. Marschall and F. Marzari and G. Naletto and N. Oklay and A. Pommerol and F. Preusker and F. Scholten and C. Tubiana and Vincent, {J. B.}",
note = "Funding Information: OSIRIS was built by a consortium of the Max-Planck-Institut f{\"u}r Sonnensystemforschung, in G{\"o}ttingen, Germany, CISAS-University of Padova, Italy, the Laboratoire d'Astrophysique de Marseille, France, the Instituto de Astrof{\'i}sica de Andalucia, CSIC, Granada, Spain, the Research and Scientific Support Department of the European Space Agency, Noordwijk, The Netherlands, The Instituto Nacional de T{\'e}cnica Aeroespacial, Madrid, Spain, the Universidad Polit{\'e}chnica de Madrid, Spain, the Department of Physics and Astronomy of Uppsala University, Sweden, and the Institut f{\"u}r Datentechnik und Kommunikationsnetze der Technischen Universit{\"a}t Braunschweig, Germany. The support of the national funding agencies of Germany (CNES), Italy (ASI), Spain (MEC), Sweden (SNSB), and the ESA Technical Directorate is gratefully acknowledged. We thank the ESA teams at ESAC, ESOC and ESTEC for their work in support of the Rosetta mission. Publisher Copyright: {\textcopyright} 2016 ESO.",
year = "2016",
month = sep,
day = "1",
doi = "10.1051/0004-6361/201628634",
language = "British English",
volume = "593",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
}