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Rosetta/OSIRIS observations of the 67P nucleus during the April 2016 flyby: high-resolution spectrophotometry

Feller, C. and Fornasier, S. and Ferrari, S. and Hasselmann, P. H. and Barucci, A. and Massironi, M. and Deshapriya, J. D. P. and Sierks, H. and Naletto, G. and Lamy, P. L. and Rodrigo, R. and Koschny, D. and Davidsson, B. J. R. and Bertaux, J.-L. and Bertini, I. and Bodewits, D. and Cremonese, G. and Da Deppo, V. and Debei, S. and De Cecco, M. and Fulle, M. and Gutierrez, P. J. and Güttler, C. and Ip, W.-H. and Keller, H. U. and Lara, L. M. and Lazzarin, M. and Lopez-Moreno, J. J. and Marzari, F. and Shi, X. and Tubiana, C. and Gaskell, B. and La Forgia, F. and Lucchetti, A. and Mottola, S. and Pajola, M. and Preusker, F. and Scholten, F. (2019) Rosetta/OSIRIS observations of the 67P nucleus during the April 2016 flyby: high-resolution spectrophotometry. Astronomy & Astrophysics, 630, A9. EDP Sciences. DOI: 10.1051/0004-6361/201833807 ISSN 0004-6361

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Official URL: https://www.aanda.org/articles/aa/abs/2019/10/aa33807-18/aa33807-18.html

Abstract

Context. From August 2014 to September 2016, the Rosetta spacecraft followed comet 67P/Churyumov-Gerasimenko along its orbit. After the comet passed perihelion, Rosetta performed a flyby manoeuvre over the Imhotep-Khepry transition in April 2016. The OSIRIS/Narrow-Angle-Camera (NAC) acquired 112 observations with mainly three broadband filters (centered at 480, 649, and 743 nm) at a resolution of up to 0.53 m/px and for phase angles between 0.095° and 62°. Aims. We have investigated the morphological and spectrophotometrical properties of this area using the OSIRIS/NAC high-Resolution observations. Methods. We assembled the observations into coregistered color cubes. Using a 3D shape model, we produced the Illumination conditions and georeference for each observation. We mapped the observations of the transition to investigate its geomorphology. Observations were photometrically corrected using the Lommel–Seeliger disk law. Spectrophotometric analyses were performed on the coregistered color cubes. These data were used to estimate the local phase reddening. Results. The Imhotep-Khepry transition hosts numerous and varied types of terrains and features.We observe an association between a feature’s nature, its reflectance, and its spectral slopes. Fine material deposits exhibit an average reflectance and spectral slope, while terrains with diamictons, consolidated material, degraded outcrops, or features such as somber boulders present a lower-than-average reflectance and higher-than-average spectral slope. Bright surfaces present here a spectral behavior consistent with terrains enriched in water-ice. We find a phase-reddening slope of 0.064 ± 0.001%/100 nm/° at 2.7 au outbound, similar to the one obtained at 2.3 au inbound during the February 2015 flyby. Conclusions. Identified as the source region of multiple jets and a host of water-ice material, the Imhotep-Khepry transition appeared in April 2016, close to the frost line, to further harbor several potential locations with exposed water-ice material among its numerous different morphological terrain units.

Item URL in elib:https://elib.dlr.de/131415/
Document Type:Article
Title:Rosetta/OSIRIS observations of the 67P nucleus during the April 2016 flyby: high-resolution spectrophotometry
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Feller, C.LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIED
Fornasier, S.LESIA, Obs. de Paris, CNRS, Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon, FranceUNSPECIFIED
Ferrari, S.Center of Studies and Activities for Space, CISAS, ‘G. Colombo’, UniversityUNSPECIFIED
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, A.LESIA Observatoire de Paris-Meudon, Meudon, FranceUNSPECIFIED
Massironi, M.Dipartimento di Geoscienze, Università di Padova, Padua, ItalyUNSPECIFIED
Deshapriya, J. D. P.LESIA, Observatoire de Paris, PSL Research University, CNRS, Univ. ParisUNSPECIFIED
Sierks, H.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Naletto, G.Univ. of Padova, Dept. of Information Engineering, Padova, ItalyUNSPECIFIED
Lamy, P. L.Laboratoire d’Astrophysique de Marseille, UMR 7326, CNRS & Aix-Marseille Université, 13388 Marseille, FranceUNSPECIFIED
Rodrigo, R.Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille), FranceUNSPECIFIED
Koschny, D.Scientific Support Office, European Space Research and Technology Centre/ESA, Keplerlaan 1, Postbus 299, 2201 AZ Noordwijk ZH, The NetherlandsUNSPECIFIED
Davidsson, B. J. R.Department of Astronomy a. Space Physics, Uppsala, bjorn.davidsson (at) physics.uu.seUNSPECIFIED
Bertaux, J.-L.laboratoire atmosphères, milieux, observations spatiales, cnrs/uvsq/upmc, 11 boulevard d’alembert, 78280 guyancourt, franceUNSPECIFIED
Bertini, I.dipartimento di astronomia, università di padova, padova, italyUNSPECIFIED
Bodewits, D.Physics Department, Auburn University, Auburn, AL 36849, USAUNSPECIFIED
Cremonese, G.INAF Osservatorio Astronomico di Padova, Padova , ItalyUNSPECIFIED
Da Deppo, V.CNR-IFN UOS Padova LUXOR, Padova, ItalyUNSPECIFIED
Debei, S.Department of Industrial Engineering University of Padova Via Venezia, Padova, ItalyUNSPECIFIED
De Cecco, M.Department of Industrial Engineering – University of Padova, viaUNSPECIFIED
Fulle, M.inaf – osservatorio astronomico di trieste, via tiepolo 11, 34143 trieste, italyUNSPECIFIED
Gutierrez, P. J.Instituto de Astrofísica de Andalucía – CSIC, 18080 Granada, SpainUNSPECIFIED
Güttler, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 337077 Göttingen, GermanyUNSPECIFIED
Ip, W.-H.National Central University, Jhongli, Taoyuan, TaiwanUNSPECIFIED
Keller, H. U.horst.keller (at) dlr.deUNSPECIFIED
Lara, L. M.Instituto de Astrofisica de Andalucía (CSIC), Glorieta de la As- tronomía s/n, 18008 Granada, SpainUNSPECIFIED
Lazzarin, M.Università di Padova, Department of Physics and Astronomy, Vicolo dell'Osservatorio 2, 35122 Padova, ItalyUNSPECIFIED
Lopez-Moreno, J. J.Instituto de Astrofisica de Andalucia, CSIC, Granada, SpainUNSPECIFIED
Marzari, F.Department of Physics and Astronomy “G. Galilei”, University of Padova, ItalyUNSPECIFIED
Shi, X.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
Gaskell, B.Planetary Science InstituteUNSPECIFIED
La Forgia, F.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Lucchetti, A.Astronomical Observatory of Padova – INAF, Vicolo dell’Osservatorio 5,UNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.dehttps://orcid.org/0000-0002-0457-3872
Pajola, M.INAF Osservatorio Astronomico di Padova, Padova , ItalyUNSPECIFIED
Preusker, F.Frank.Preusker (at) dlr.deUNSPECIFIED
Scholten, F.Frank.scholten (at) dlr.deUNSPECIFIED
Date:2019
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:630
DOI :10.1051/0004-6361/201833807
Page Range:A9
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:space vehicles – space vehicles: instruments – comets: individual: 67P/Churyumov–Gerasimenko – techniques: image processing – methods: data analysis
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 > Planetary Geodesy
Institute of Planetary Research > Asteroids and Comets
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:28 Nov 2019 09:32
Last Modified:18 Mar 2020 15:09

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