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Catalogue POP – Notice individuelle de publication

Auger Anne-Thérèse, Groussin Olivier, Jorda Laurent, Bouley Sylvain, Gaskell Robert W., Lamy Philippe, Capanna Claire, Thomas Nicholas, Pommerol Antoine, Sierks Holger, Barbieri Cesare, Rodrigo Rafael, Koschny Detlef, Rickman Hans, Keller Horst Uwe, Agarwal Jessica, A'Hearn M. F., Barucci Maria Antonella, Bertaux Jean-Loup, Bertini Ivano, Cremonese Gabriele, Da Deppo Vania, Davidsson Björn, Debei Stefano, De Cecco M., El-Maarry Mohamed Ramy, Fornasier Sonia, Fulle Marco, Gutierrez Pedro J., Güttler Carsten, Hviid Stubbe F., Ip W., Knollenberg Jörg, Kramm Rainer, Kührt Ekkehard, Küppers Michael, La Forgia Fiorangela, Lara Luisa M., Lazzarin Monica, López-Moreno José J., Marchi Simone, Marzari Francesco, Massironi Matteo, Michalik Harald, Naletto Giampiero, Oklay Nilda, Pajola Maurizio, Sabau Lola, Tubiana Cecilia, Vincent Jean-Baptiste, Wenzel Klaus-Peter

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

Astronomy and Astrophysics, 2015, vol. 583

Référence DOI : 10.1051/0004-6361/201525947
Référence ADS : 2015A&A...583A..35A

Résumé :

Context. 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. <BR /> 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. <BR /> Methods: We used OSIRIS NAC images, gravitational heights and slopes, and digital terrain models to map and measure the morphologies of Imhotep. <BR /> 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 geomorphological 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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