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Geologic mapping of the Comet 67P/Churyumov-Gerasimenko's Northern Hemisphere

Lorenza Giacomini 1 Matteo Massironi 1 Mohamed R. El-Maarry 2 Luca Penasa 3 Maurizio Pajola 4 Nicholas Thomas 2 Stephen C. Lowry 5 Cesare Barbieri 6 Gabriele Cremonese 7 Francesca Ferri 3 Giampiero Naletto 8 Ivano Bertini 3 Fiorangela La Forgia 6 Mario Lazzarin 6 Francesco Marzari 6 Holger Sierks 9 Philippe L. Lamy 10 Rafael Rodrigo 11, 12 Hans Rickman 13, 14 Detlef Koschny 15 Horst U. Keller 16 Jessica Agarwal 9 Michael F. A'Hearn 17 Anne-Thérèse Auger 10 Maria Antonietta Barucci 18 Jean-Loup Bertaux 19 Sebastien Besse 20 Dennis Bodewits 17 Vania da Deppo 21 Björn Davidsson 14 Mariolino de Cecco 22 Stefano Debei 23 Sonia Fornasier 18 Marco Fulle 24 Olivier Groussin 10 Pedro J. Gutiérrez 25 Carsten Güttler 9 Stubbe F. Hviid 26 Wing-Huen Ip 27 Laurent Jorda 10 Jörg Knollenberg 26 Gabor Kovacs 9 J.-Rainer Kramm 9 Ekkehard Kührt 26 Michael Küppers 28 Luisa M. Lara 25 Jose J. Lopez Moreno 25 Sara Magrin 6 Harald Michalik 29 Nilda Oklay 9 Antoine Pommerol 2 Frank Preusker 26 Frank Scholten 26 Cecilia Tubiana 9 Jean-Baptiste Vincent 9
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : OSIRIS, the Scientific Imaging System onboard the Rosetta mission, has been acquiring images of the nucleus of the comet 67P/Churyumov-Gerasimenko since August 2014 with a resolution that allows a detailed analysis of its surface. Indeed, data reveal a complex surface morphology that is likely the expression of different processes that occurred at different times on the cometary nucleus. In order to characterize these different morphologies and better understand their distribution, we performed a geologic mapping of comet's 67P northern hemisphere in which features have been distinguished based on their morphological, textural and stratigraphic characteristics. For this purpose we used NAC images acquired on August and September 2014 with a spatial scale ranging from 1.2 to 2.4 m/pixel. Several different geologic units have been identified on the basis of their different surface textures, granulometry, and morphology. Some of these units are distinctive and localised, whereas others are more common and distributed all over the northern hemisphere. Moreover, different types of linear features have been distinguished on the basis of their morphology. Some of these lineaments have never been observed before on a comet and can offer important clues on the internal structures of the nucleus itself. The geologic mapping results presented here will allow us to better understand the processes that affected the nucleus’ surface and thus the origin and evolutionary history of comet 67P/Churyumov-Gerasimenko.
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Submitted on : Wednesday, December 9, 2020 - 8:49:43 PM
Last modification on : Tuesday, May 3, 2022 - 11:04:03 AM
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Lorenza Giacomini, Matteo Massironi, Mohamed R. El-Maarry, Luca Penasa, Maurizio Pajola, et al.. Geologic mapping of the Comet 67P/Churyumov-Gerasimenko's Northern Hemisphere. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 462 (Suppl. 1), pp.S352-S367. ⟨10.1093/mnras/stw2848⟩. ⟨insu-01393316⟩



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