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Spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko from the OSIRIS instrument onboard the ROSETTA spacecraft

Fornasier, S. and Hasselmann, P. H. and Barucci, M.A. and Feller, C. and Besse, S. and Leyrat, C. and Lara, L. and Gutierrez, P. J. and Oklay, N. and Tubiana, C. and Scholten, F. and Sierks, H. and Barbieri, C. and Lamy, P. L. and Rodrigo, R. and Koschny, D. and Rickman, H. and Keller, H. U. and Agarwal, J. and A’Hearn, M. F. and Bertaux, J.-L. and Bertini, I. and Cremonese, G. and Da Deppo, V. and Davidsson, B. and Debei, S. and De Cecco, M. and Fulle, M. and Groussin, O. and Güttler, C. and Hviid, S. and Ip, W. and Jorda, L. and Knollenberg, J. and Kovacs, G. and Kramm, R. and Kührt, E. and Küppers, M. and La Forgia, F. and Lazzarin, M. and Lopez Moreno, J. J. and Marzari, F. and Matz, K.-D. and Michalik, H. and Moreno, F. and Mottola, S. and Naletto, G. and Pajola, M. and Pommerol, A. and Preusker, Frank and Shi, X. and Snodgrass, C. and Thomas, N. and Vincent, J.-B. (2015) Spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko from the OSIRIS instrument onboard the ROSETTA spacecraft. Astronomy & Astrophysics, 583, A30. EDP Sciences. DOI: 10.1051/0004-6361/201525901 ISSN 0004-6361

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Abstract

Context. The European Space Agency Rosetta mission is orbiting the comet 67P/Churyumov-Gerasimenko since August 2014, and it is now in the escort phase of the comet. A large complement of scientific experiments designed to complete the most detailed study of a comet ever attempted are on board Rosetta. Aims. In this work we present the results on the 67P nucleus photometric and spectrophotometric properties derived from the OSIRIS imaging system, constituted of a Wide Angle Camera (WAC) and a Narrow Angle Camera (NAC). The observations presented here were performed in the July- beginning of August 2014 timeframe, during the approach phase, when OSIRIS was mapping the surface of the comet with several filters at different phase angles (1.3°–54°), and with a resolution up to 2.1 m/px. Methods. The OSIRIS images were processed with the OSIRIS standard pipeline, then converted in I/F radiance factor and corrected for the illumination conditions at each pixel using the Lommel-Seeliger’s disk law. Colour cubes of the surface have been hence produced by stacking registered and illumination corrected images. Furthermore photometric analysis was performed both on integrated photometry in several filters, and on disk resolved images acquired with the NAC orange filter, centred at 649 nm, using Hapke modelling. Results. The disk-averaged phase function of the 67P nucleus shows a strong opposition surge with a G parameter value of - 0.13±0.01, in the HG system formalism, and an absolute magnitude H^_{v}(1, 1, 0) = 15.74±0.02 mag. The integrated spectrophotometry in 20 filters covering the 250-1000 nm wavelength range shows a red spectral behaviour, without clear absorption bands except for a potential absorption centred at ∼ 290 nm, possibly due to SO^_{2} ice. The nucleus shows an important phase reddening, with disk- averaged spectral slopes increasing from 11%/(100 nm) to 16%/(100 nm) in the 1.3°–54° phase angle range. The geometric albedo of the comet is 6.5±0.2% at 649 nm, with local variations up to ∼ 16% in the Hapi region. From the disk resolved images the spectral slope has been computed, together with local spectrophotometry, and three distinct groups of regions (blue, moderately red, and red) have been identified. The Hapi region is the brightest, the bluest in term of spectral slope, and the most active surface on the comet. Local spectrophotometry puts in evidence an enhancement of the flux in the 700-750 nm associated to coma emissions.

Item URL in elib:https://elib.dlr.de/97176/
Document Type:Article
Title:Spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko from the OSIRIS instrument onboard the ROSETTA spacecraft
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fornasier, S.LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, France e-mail: sonia.fornasier (at) obspm.frUNSPECIFIED
Hasselmann, P. H.LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIED
Barucci, M.A.LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIED
Feller, C.LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIED
Besse, S.Research and Scientific Support Department, European Space Agency, 2201 Noordwijk, The NetherlandsUNSPECIFIED
Leyrat, C.LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIED
Lara, L.Instituto de Astrofísica de Andalucía – CSIC, 18080 Granada, SpainUNSPECIFIED
Gutierrez, P. J.Instituto de Astrofísica de Andalucía – CSIC, 18080 Granada, SpainUNSPECIFIED
Oklay, N.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Tubiana, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Scholten, F.Institute of Planetary Research, DLR, Rutherfordstrasse 2, 12489 Berlin, GermanyUNSPECIFIED
Sierks, H.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Barbieri, C.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Lamy, P. L.Laboratoire d’Astrophysique de Marseille UMR 7326, CNRS & Aix Marseille Université, 13388 Marseille Cedex 13, FranceUNSPECIFIED
Rodrigo, R.Centro de Astrobiología, CSIC-INTA, 28850 Torrejón de Ardoz, Madrid, SpainUNSPECIFIED
Koschny, D.Research and Scientific Support Department, European Space Agency, 2201 Noordwijk, The NetherlandsUNSPECIFIED
Rickman, H.Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, SwedenUNSPECIFIED
Keller, H. U.Institute for Geophysics and Extraterrestrial Physics, TU Braunschweig, 38106 Braunschweig, GermanyUNSPECIFIED
Agarwal, J.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
A’Hearn, M. F.Department for Astronomy, University of Maryland, College Park, MD 20742-2421, USAUNSPECIFIED
Bertaux, J.-L.LATMOS, CNRS/UVSQ/IPSL, 11 Boulevard d’Alembert, 78280 Guyancourt, FranceUNSPECIFIED
Bertini, I.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Cremonese, G.INAF–Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIED
Da Deppo, V.CNR–IFN UOS Padova LUXOR, Via Trasea 7, 35131 Padova, ItalyUNSPECIFIED
Davidsson, B.Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, SwedenUNSPECIFIED
Debei, S.Department of Mechanical Engineering – University of Padova, Via Venezia 1, 35131 Padova, ItalyUNSPECIFIED
De Cecco, M.UNITN, Universitá di Trento, Via Mesiano, 77, 38100 Trento, ItalyUNSPECIFIED
Fulle, M.INAF – Osservatorio Astronomico di Trieste, via Tiepolo 11, 34143 Trieste, ItalyUNSPECIFIED
Groussin, O.Laboratoire d’Astrophysique de Marseille UMR 7326, CNRS & Aix Marseille Université, 13388 Marseille Cedex 13, FranceUNSPECIFIED
Güttler, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Hviid, S.stubbe.hviid (at) dlr.deUNSPECIFIED
Ip, W.Institute for Space Science, National Central University, 32054 Chung-Li, TaiwanUNSPECIFIED
Jorda, L.Laboratoire d’Astrophysique de Marseille UMR 7326, CNRS & Aix Marseille Université, 13388 Marseille Cedex 13, FranceUNSPECIFIED
Knollenberg, J.joerg.knollenberg (at) dlr.deUNSPECIFIED
Kovacs, G.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Kramm, R.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Küppers, M.ESA/ESAC, PO Box 78, 28691 Villanueva de la Cañada, SpainUNSPECIFIED
La Forgia, F.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Lazzarin, M.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Lopez Moreno, J. J.Instituto de Astrofísica de Andalucía – CSIC, 18080 Granada, SpainUNSPECIFIED
Marzari, F.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Matz, K.-D.klaus-dieter.matz (at) dlr.deUNSPECIFIED
Michalik, H.Institut für Datentechnik und Kommunikationsnetze, 38106 Braun- schweig, GermanyUNSPECIFIED
Moreno, F.Instituto de Astrofísica de Andalucía – CSIC, 18080 Granada, SpainUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Naletto, G.Department of Information Engineering - University of Padova, Via Gradenigo 6, 35131 Padova, ItalyUNSPECIFIED
Pajola, M.Center of Studies and Activities for Space (CISAS) "G. Colombo", University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Pommerol, A.Physikalisches Institut, Sidlerstrasse 5, University of Bern, CH-3012 Bern, SwitzerlandUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Shi, X.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Snodgrass, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Thomas, N.Physikalisches Institut, Sidlerstrasse 5, University of Bern, CH-3012 Bern, SwitzerlandUNSPECIFIED
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 :10.1051/0004-6361/201525901
Page Range:A30
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:Comet, 67P/Churyumov-Gerasimenko, data analysis, photometric
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
Institute of Planetary Research > Planetary Geology
Deposited By: Bründl, Tara-Marie
Deposited On:08 Dec 2015 13:22
Last Modified:08 Mar 2018 18:22

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