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

    Lucchetti, A. and Cremonese, G. and Jorda, L. and Poulet, F. and Bibring, J.-P. and Pajola, M. and La Forgia, F. and Massironi, M. and El-Maarry, Mohamed Ramy and Oklay, N. and Sierks, H. and Barbieri, C. and Lamy, P. and Rodrigo, R. and Koschny, D. and Rickman, H. and Keller, H.U. and Agarwal, J. and A’Hearn, M.F. and Barucci, M.A. and Bertaux, J.-L. and Bertini, I. and Da Deppo, V. and Davidsson, B. and Debei, S. and De Cecco, M. and Fornasier, S. and Fulle, M. and Groussin, O. and Gutierrez, P.J. and Güttler, C. and Hviid, S.F. and Ip, W.-H. and Knollenberg, J. and Kramm, J.-R. and Kührt, E. and Küppers, M. and Lara, L.M. and Lazzarin, M. and Lopez Moreno, J. J. and Marzari, F. and Mottola, S. and Naletto, G. and Preusker, F. and Scholten, F. and Thomas, N. and Tubiana, C. and Vincent, J.-B. (2015) Characterization of the Abydos region through OSIRIS high-resolution images in support of CIVA measurements. Astronomy & Astrophysics 585 , L1. ISSN 0004-6361.

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    Abstract

    Context. 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.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): comets: general / comets: individual: 67P/Churyumov-Gerasimenko / methods: data analysis
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Administrator
    Date Deposited: 09 Nov 2018 14:44
    Last Modified: 09 Nov 2018 14:44
    URI: http://eprints.bbk.ac.uk/id/eprint/25023

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