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Geomorphology of the Imhotep region on comet 67P/Churyumov-Gerasimenko from OSIRIS observations

A.-T. Auger 1, 2 Olivier Groussin 1 Laurent Jorda 1 S. Bouley 3, 2 R. Gaskell 4 Philippe L. Lamy 1 C. Capanna 1 Nicholas Thomas 5 A. Pommerol 5 Holger Sierks 6 C. Barbieri 7 R. Rodrigo 8, 9 Detlef Koschny 10 Hans Rickman 11, 12 Horst U. Keller 13 Jessica Agarwal 6 Michael F. A'Hearn 14 M. A. Barucci 15 Jean-Loup Bertaux 16 Ivano Bertini 17 Gabriele Cremonese 18 Vania Da Deppo 19 Björn Davidsson 12 Stefano Debei 18 Mariolino De Cecco 20 M. R. El-Maarry 5 Sonia Fornasier 21, 15 Marco Fulle 22 Pedro J. Gutiérrez 23 Carsten Güttler 6 Stubbe Hviid 24 W.-H Ip 25 Jörg Knollenberg 24 J.-R. Kramm 6 Ekkehard Kührt 24 Michael Küppers 26 Florangela La Forgia 7 Luisa M. Lara 23 M. Lazzarin 7 Jose J. Lopez Moreno 23 S. Marchi 27 Francesco Marzari 7 Matteo Massironi 28, 17 Harald Michalik 29 Giampiero Naletto 30, 17, 19 Nilda Oklay 6 Maurizio Pajola 17 L. Sabau 31 Cécilia Tubiana 6 Jean-Baptiste Vincent 6 K.-P. Wenzel 10 
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Since August 2014, the OSIRIS Narrow Angle Camera (NAC) onboard the Rosetta spacecraft has acquired high spatial resolution images of the nucleus of comet 67P/Churyumov-Gerasimenko, down to the decimeter scale. This paper focuses on the Imhotep region, located on the largest lobe of the nucleus, near the equator. Aims. We map, inventory, and describe the geomorphology of the Imhotep region. We propose and discuss some processes to explain the formation and ongoing evolution of this region. Methods. We used OSIRIS NAC images, gravitational heights and slopes, and digital terrain models to map and measure the mor- phologies of Imhotep. Results. The Imhotep region presents a wide variety of terrains and morphologies: smooth and rocky terrains, bright areas, linear features, roundish features, and boulders. Gravity processes such as mass wasting and collapse play a significant role in the geomor- phological evolution of this region. Cometary processes initiate erosion and are responsible for the formation of degassing conduits that are revealed by elevated roundish features on the surface. We also propose a scenario for the formation and evolution of the Imhotep region; this implies the presence of large primordial voids inside the nucleus, resulting from its formation process.
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A.-T. Auger, Olivier Groussin, Laurent Jorda, S. Bouley, R. Gaskell, et al.. Geomorphology of the Imhotep region on comet 67P/Churyumov-Gerasimenko from OSIRIS observations. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 583, A35 (13 p.). ⟨10.1051/0004-6361/201525947⟩. ⟨insu-01205392⟩



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