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Phase-curve analysis of comet 67P/Churyumov-Gerasimenko at small phase angles

Masoumzadeh, N and Kolokolova, L. and Tubiana, C. and El-Maarry, M. R. and Mottola, S and Güttler, C. and Snodgrass, C. and Sierks, H. and Naletto, G. and Lamy, P. L. and Rodrigo, R. and Koschny, D. and Davidsson, B. and Barucci, M. A. 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 Deller, J. and Fornasier, S. and Fulle, M. and Gutierrez, P. J. and Hasselmann, P. H. 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 Toth, I. (2019) Phase-curve analysis of comet 67P/Churyumov-Gerasimenko at small phase angles. Astronomy & Astrophysics, 630, A11. EDP Sciences. DOI: 10.1051/0004-6361/201834845 ISSN 0004-6361

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Official URL: https://www.aanda.org/articles/aa/abs/2019/10/aa34845-18/aa34845-18.html

Abstract

Aims. The Rosetta-OSIRIS images acquired at small phase angles in three wavelengths during the fly-by of the spacecraft on 9–10 April 2016 provided a unique opportunity to study the opposition effect on the surface of comet 67P/Churyumov-Gerasimenko (67P). Our goal is to study phase curves of the nucleus at small phase angles for a variety of surface structures to show the differences in their opposition effect and to determine which surface properties cause the differences. Methods. We used OSIRIS NAC images that cover the Ash-Khepry-Imhotep region to extract the phase curve, that is, the reflectance of the surface as a function of phase angle. We selected six regions of interest (ROIs) and derived the phase curves for each ROI. We fit a linear-exponential function to the phase curves. The resulting model parameters were then interpreted by spectrophotometric, geomorphological, and phase-ratio analyses, and by investigating the influence of structural and textural properties of the surface. Results. We find evidence for the opposition effect (deviation of the phase curve from linear behavior) in phase curves for all areas.We found an anticorrelation between the phase ratio and reflectance in a small phase angle range. This provides evidence for the shadowhiding effect. We conclude that the decrease in the slope of the phase ratio versus reflectance indicates a decrease in the proportion of shadowed regions and reduces the contribution of the shadow-hiding effect. Large uncertainties in the determination of the Opposition effect parameters with respect to wavelength do not allow us to conclusively claim coherent backscattering in the opposition effect phenomenon. Based on the two analyses, we conclude that the opposition effect of comet 67P in the Ash-Khepry-Imhotep region is mainly affected by shadow-hiding.

Item URL in elib:https://elib.dlr.de/131448/
Document Type:Article
Title:Phase-curve analysis of comet 67P/Churyumov-Gerasimenko at small phase angles
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Masoumzadeh, NMax-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Kolokolova, L.Department for Astronomy, University of Maryland, College Park,UNSPECIFIED
Tubiana, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
El-Maarry, M. R.Department of Earth and Planetary Sciences, Birkbeck College,University of London, London, UKUNSPECIFIED
Mottola, Sstefano.mottola (at) dlr.dehttps://orcid.org/0000-0002-0457-3872
Güttler, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 337077 Göttingen, GermanyUNSPECIFIED
Snodgrass, C.Planetary and Space Sciences, Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes, Buckinghamshire MK7 6AA, UKUNSPECIFIED
Sierks, H.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Naletto, G.Department of Information Engineering - University of Padova, Via Gradenigo 6, 35131 Padova, ItalyUNSPECIFIED
Lamy, P. L.Laboratoire d’Astrophysique de Marseille, UMR 7326, CNRS & Aix-Marseille Université, 13388 Marseille, FranceUNSPECIFIED
Rodrigo, R.Centro de Astrobiologa, CSIC-INTA, 28850 Torrejon de Ardoz, Madrid, Spain; International Space Science Institute, Hallerstrasse 6, 3012, Bern, SwitzerlandUNSPECIFIED
Koschny, D.Research and Scientific Support Department of the European Space Agency, ESTEC, Noordwijk, The NetherlandsUNSPECIFIED
Davidsson, B.Jet Propulsion Laboratory, M/S 183-301, 4800 Oak Grove Drive, Pasadena, CA 91109, USAUNSPECIFIED
Barucci, M. A.LESIA, Obs. de Paris, CNRS, Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon, FranceUNSPECIFIED
Bertaux, J.-L.LATMOS, CNRS/UVSQ/IPSL, 11 Boulevard d’Alembert, 78280 Guyancourt, FranceUNSPECIFIED
Bertini, I.Dipartimento di Astronomia and CISAS, Università di Padova, Padova, ItalyUNSPECIFIED
Bodewits, D.Physics Department, Auburn University, Auburn, AL 36849, USAUNSPECIFIED
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
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
Deller, J.Max-Planck Institut für Sonnensystemforschung, Goettingen, GermanyUNSPECIFIED
Fornasier, S.LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris, FranceUNSPECIFIED
Fulle, M.ISAS, International School for Advanced Studies, Trieste, ItalyUNSPECIFIED
Gutierrez, P. J.Instituto de Astrofísica de Andalucía – CSIC, 18080 Granada, SpainUNSPECIFIED
Hasselmann, P. H.LESIA – Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, FranceUNSPECIFIED
Ip, W.-H.Institute of Space Science, National Central University, Chung Li, 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.Department of Physics and Astronomy, Padova University, Vicolo dell’Osservatorio 3, 35122, Padova, ItalyUNSPECIFIED
Lopez-Moreno, J. J.Instituto de Astrofisica de Andalucia (CSIC), c/ Glorieta de la AstronomiaUNSPECIFIED
Marzari, F.Università di Padova, Department of Physics and Astronomy, Vicolo dell'Osservatorio 2, 35122 Padova, ItalyUNSPECIFIED
Shi, X.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Toth, I.MTA CSFK Konkoly Observatory of the Hungarian Academy of Sciences Budapest, Konkoly Thege M. ut 15–17. H1121 Budapest, HungaryUNSPECIFIED
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 :10.1051/0004-6361/201834845
Page Range:A11
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:comets: general – comets: individual: 67P/Churyumov-Gerasimenko – techniques: photometric – techniques: image processing
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
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:28 Nov 2019 09:39
Last Modified:28 Nov 2019 09:39

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