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Geomorphology and Spectrophotometry of Philae’s Landing Site on Comet 67P Churyumov-Gerasimenko

La Forgia, F. and Giacomini, L. and Lazzarin, M. and Massironi, M. and Oklay, N. and Scholten, Frank and Pajola, M. and Bertini, I. and Cremonese, G. and Barbieri, C. and Naletto, G. and Simioni, E. and Preusker, Frank and Thomas, N. and Sierks, H. and Lamy, P. and Rodrigo, R. and Koschny, D. and Rickman, H. and Keller, H. U. and Agarwal, J. and Auger, A.-T. and A’Hearn, M. F. and Barucci, M. A. and Bertaux, J.-L. and Da Deppo, V. and Davidsson, B. and Besse, S. and Debei, S. and De Cecco, M. and El-Maarry, M. R. and Ferri, F. and Fornasier, S. and Fulle, M. and Groussin, O. and Gutiérrez, P. J. and Güttler, C. and Hall, I. and Hviid, S. and Ip, W.-H. and Jorda, L. and Knollenberg, J. and Kramm, J. R. and Kührt, E. and Küppers, M. and Lara, L.-M. and Magrin, S. and Marzari, F. and Michalik, H. and Lopez Moreno, J. J. and Mottola, S. and Pommerol, A. and Tubiana, C. and Vincent, J.-B. (2015) Geomorphology and Spectrophotometry of Philae’s Landing Site on Comet 67P Churyumov-Gerasimenko. Astronomy & Astrophysics, 583, A41. EDP Sciences. DOI: 10.1051/0004-6361/201525983 ISSN 0004-6361

Full text not available from this repository.

Abstract

Context. On 12 November 2014 the European mission Rosetta succeeded in deploying a lander, named Philae, on the surface of one of the smallest, low-gravity and more primitive bodies of the Solar System, the comet 67P/Churyumov-Gerasimenko (67P). Aims. The aim of this paper is to provide a comprehensive geomorphological and spectrophotometric analysis of the region where Philae landed in order to give an essential framework for the interpretation of its measurements. Methods. OSIRIS images, coupled with the 3D shape model based on stereo-photogrammetric analysis have been used to interpret the geomorphology of the site. Photometric modelling via Akimov’s parameter-less function has been used to correct the reflectance for the effects of the viewing and illumination conditions. Spectral analysis on co-registered colour cubes have been used to retrieve spectrophotometric properties. Results. The landing site shows a low average reflectance of 0.96% in the orange filter (λ = 649.2 nm) at about 63° phase angle and a global featureless spectrum with an average red spectral slope of 15.2%/100 nm between 480.7 nm (blue filter) and 882.1 nm (NearIR filter). The spatial analysis shows a well-established correlation between the geomorphological units and the photometric characteristics of the surface. In particular smooth deposits have highest reflectance and less steep spectrum if compared to the outcropping material across the area. Conclusions. We interpret the results as indications that Agilkia spectrophotometry is compatible with a composition of organic materials showing small local variegation. Texture and grain size effects alone can not explain the spectral variegation and space weathering is rather unlikely for short-period comets. We therefore conclude that the photometric variegation is due to a compositional differentiation. This might be tentatively interpreted as the effect of the efficient dust-transport processes acting on 67P (Thomas et al. submitted). High activity regions might be the original sources for smooth fine-grained materials which then covered Agilkia as a consequence of airfall of residual material. Further ROSETTA observations performed as the comet gets closer to the Sun would help interpreting the processes working at shaping the landing site and the overall nucleus.

Item URL in elib:https://elib.dlr.de/97394/
Document Type:Article
Title:Geomorphology and Spectrophotometry of Philae’s Landing Site on Comet 67P Churyumov-Gerasimenko
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
La Forgia, F.Dipartimento di Fisica e Astronomia “G. Galilei”, University of Padova, vic. Osservatorio 3, 35122 Padova, Italy, E-Mail: fiorangela.laforgia (at) unipd.itUNSPECIFIED
Giacomini, L.Dipartimento di Geoscienze, University of Padova, via G. Gradenigo 6, 35131 Padova, ItalyUNSPECIFIED
Lazzarin, M.Dipartimento di Fisica e Astronomia “G. Galilei”, University of Padova, vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Massironi, M.Dipartimento di Geoscienze, University of Padova, via G. Gradenigo 6, 35131 Padova, ItalyUNSPECIFIED
Oklay, N.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Scholten, Frankfrank.scholten (at) dlr.deUNSPECIFIED
Pajola, M.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Bertini, I.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Cremonese, G.INAF Osservatorio Astronomico di Padova, vic. dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIED
Barbieri, C.Dipartimento di Fisica e Astronomia “G. Galilei”, University of Padova, vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Naletto, G.Department of Information Engineering, University of Padova, via Gradenigo 6/B, 35131 Padova, ItalyUNSPECIFIED
Simioni, E.INAF Osservatorio Astronomico di Padova, vic. dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Thomas, N.Physikalisches Institut der Universität Bern, Sidlerstr. 5, 3012 Bern, SwitzerlandUNSPECIFIED
Sierks, H.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Lamy, P.Aix Marseille Université, CNRS LAM (Laboratoire d’Astrophysique de Marseille), UMR 7326, 13388 Marseille, FranceUNSPECIFIED
Rodrigo, R.Centro de Astrobiología, CSIC-INTA, Torrejón de Ardoz, 28850 Madrid, SpainUNSPECIFIED
Koschny, D.Scientific Support Office, European Space Research and Technology Centre/ESA, Keplerlaan 1, Postbus 299, 2201 AZ Noordwijk ZH, The NetherlandsUNSPECIFIED
Rickman, H.PAS Space Research Centre, Bartycka 18A, 00716 Warszawa, PolandUNSPECIFIED
Keller, H. U.Institut für Geophysik und extraterrestrische Physik, TU Braunschweig, 38106 Braunschweig, GermanUNSPECIFIED
Agarwal, J.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Auger, A.-T.Aix Marseille Université, CNRS LAM (Laboratoire d’Astrophysique de Marseille), UMR 7326, 13388 Marseille, FranceUNSPECIFIED
A’Hearn, M. F.University of Maryland, Department of Astronomy, College Park, MD 20742-2421 USAUNSPECIFIED
Barucci, M. A.LESIA-Observatoire de Paris, CNRS, UPMC, Univ. Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Principal Cedex, FranceUNSPECIFIED
Bertaux, J.-L.LATMOS, CNRS/UVSQ/IPSL, 11 Boulevard d’Alembert, 78280 Guyancourt, FranceUNSPECIFIED
Da Deppo, V.CNR-IFN UOS Padova LUXOR, via Trasea 7, 35131 Padova, ItalyUNSPECIFIED
Davidsson, B.Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, SwedenUNSPECIFIED
Besse, S.Scientific Support Office, European Space Research and Technology Centre/ESA, Keplerlaan 1, Postbus 299, 2201 AZ Noordwijk ZH, The NetherlandsUNSPECIFIED
Debei, S.Department of Industrial Engineering, University of Padova, Via Venezia 1, 35131 Padova, ItalyUNSPECIFIED
De Cecco, M.University of Trento, via Sommarive 9, 38123 Trento, ItalyUNSPECIFIED
El-Maarry, M. R.Physikalisches Institut der Universität Bern, Sidlerstr. 5, 3012 Bern, SwitzerlandUNSPECIFIED
Ferri, F.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Fornasier, S.LESIA-Observatoire de Paris, CNRS, UPMC, Univ. Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Principal Cedex, FranceUNSPECIFIED
Fulle, M.INAF Osservatorio Astronomico di Trieste, Via Tiepolo 11, 34014 Trieste, ItalyUNSPECIFIED
Groussin, O.Aix Marseille Université, CNRS LAM (Laboratoire d’Astrophysique de Marseille), UMR 7326, 13388 Marseille, FranceUNSPECIFIED
Gutiérrez, P. J.Instituto de Astrofísica de Andalucía-CSIC, 18008 Granada, SpainUNSPECIFIED
Güttler, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Hall, I.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Hviid, S.stubbe.hviid (at) dlr.deUNSPECIFIED
Ip, W.-H.Graduate Institute of Astronomy, National Central University, 300 Chung-Da Rd Chung-Li 32054, TaiwanUNSPECIFIED
Jorda, L.Aix Marseille Université, CNRS LAM (Laboratoire d’Astrophysique de Marseille), UMR 7326, 13388 Marseille, FranceUNSPECIFIED
Knollenberg, J.joerg.knollenberg (at) dlr.deUNSPECIFIED
Kramm, J. R.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Küppers, M.Operations Department European Space Astronomy Centre/ESA, P.O. Box 78, 28691 Villanueva de la Cañada, Madrid, SpainUNSPECIFIED
Lara, L.-M.Instituto de Astrofísica de Andalucía-CSIC, 18008 Granada, SpainUNSPECIFIED
Magrin, S.Dipartimento di Fisica e Astronomia “G. Galilei”, University of Padova, vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Marzari, F.Dipartimento di Fisica e Astronomia “G. Galilei”, University of Padova, vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Michalik, H.Institut für Datentechnik und Kommunikationsnetze der TU Braunschweig, Hans-Sommer-Str. 66, 38106 Braunschweig, GermanyUNSPECIFIED
Lopez Moreno, J. J.Instituto de Astrofísica de Andalucía-CSIC, 18008 Granada, SpainUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Pommerol, A.Physikalisches Institut der Universität Bern, Sidlerstr. 5, 3012 Bern, SwitzerlandUNSPECIFIED
Tubiana, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Vincent, J.-B.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Date:2015
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:583
DOI :10.1051/0004-6361/201525983
Page Range:A41
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:comets, 67P/C-G, photometry, variegation, geomorphology
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Institute of Planetary Research > Planetary Geodesy
Deposited By: Bründl, Tara-Marie
Deposited On:08 Dec 2015 13:32
Last Modified:01 Dec 2018 19:51

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