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Characterization of the Abydos region through OSIRIS high-resolution images in support of CIVA measurements

Alice Lucchetti 1, 2 Gabriele Cremonese 2 Laurent Jorda 3 François Poulet 4 Jean-Pierre Bibring 4 Maurizio Pajola 1 Fiorangela La Forgia 5 Matteo Massironi 6 Mohamed El-Maarry 7 Nilda Oklay 8 Holger Sierks 8 Cesare Barbieri 5 Philippe Lamy 3 Rafael Rodrigo 9, 10 Detlef Koschny 11 Hans Rickman 12, 13 Horst U. Keller 14 Jessica Agarwal 7 Michael F. A'Hearn 15 Maria Antonietta Barucci 16 Jean-Loup Bertaux 17 Ivano Bertini 1 Vania da Deppo 18 Björn Davidsson 12 Stefano Debei 19 Mariolino de Cecco 20 Sonia Fornasier 16 Marco Fulle 21 Olivier Groussin 3 Pedro J. Gutiérrez 22 Carsten Güttler 8 Stubbe F. Hviid 23 Wing-Huen Ip 24 Jörg Knollenberg 23 J.-Rainer Kramm 8 Ekkehard Kührt 23 Michael Küppers 25 Luisa Lara 22 Monica Lazzarin 5 Jose Lopez-Moreno 22 Francesco Marzari 5 Stefano Mottola 23 Giampiero Naletto 26, 1 Frank Preusker 23 Frank Scholten 23 Nicolas Thomas 7 Cécilia Tubiana 8 Jean-Baptiste Vincent 8 
Abstract : On 12 November 2014, the European mission Rosetta delivered the Philae lander on the nucleus of comet 67P/Churyumov-Gerasimenko (67P). After the first touchdown, the lander bounced three times before finally landing at a site named Abydos. Aims. We provide a morphologically detailed analysis of the Abydos landing site to support Philae’s measurements and to give context for the interpretation of the images coming from the Comet Infrared and Visible Analyser (CIVA) camera system onboard the lander. Methods. We used images acquired by the OSIRIS Narrow Angle Camera (NAC) on 6 December 2014 to perform the analysis of the Abydos landing site, which provided the geomorphological map, the gravitational slope map, the size-frequency distribution of the boulders. We also computed the albedo and spectral reddening maps. Results. The morphological analysis of the region could suggest that Philae is located on a primordial terrain. The Abydos site is surrounded by two layered and fractured outcrops and presents a 0.02 km2 talus deposit rich in boulders. The boulder size frequency distribution gives a cumulative power-law index of −4.0 + 0.3/ − 0.4, which is correlated with gravitational events triggered by sublimation and/or thermal fracturing causing regressive erosion. The average value of the albedo is 5.8% at λ1= 480.7 nm and 7.4% at λ2= 649.2 nm, which is similar to the global albedos derived by OSIRIS and CIVA, respectively.
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Alice Lucchetti, Gabriele Cremonese, Laurent Jorda, François Poulet, Jean-Pierre Bibring, et al.. Characterization of the Abydos region through OSIRIS high-resolution images in support of CIVA measurements. Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 585, L1 (5 p.). ⟨10.1051/0004-6361/201527330⟩. ⟨insu-01234274⟩



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