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The backscattering ratio of comet 67P/Churyumov-Gerasimenko dust coma as seen by OSIRIS onboard Rosetta

Bertini, I. and La Forgia, Fiorangela and Tubiana, C. and Güttler, C. and Moreno, F. and Agarwal, J. and Munoz, O. and Mottola, S. and Ivanovsky, S. and Pajola, M. and Lucchetti, A. and Petropoulou, V. and Lazzarin, M. and Rotundi, A. and Bodewits, Dennis and Frattin, E. and Toth, I. and Masoumzadeh, Nafiseh and Kovacs, G. and Rinaldi, G. and Guirado, D. and Sierks, H. and Naletto, G. and Lamy, P. and Rodrigo, R. and Koschny, D. and Davidsson, B. and Barbieri, C. and Barucci, M. A. and Bertaux, J.-L. and Cambianica, P. and Cremonese, G. and Da Deppo, V. and Debei, S. and De Cecco, M. and Deller, J. and Ferrari, Sabrina and Ferri, F. and Fornasier, S. and Gutierrez, P.J. and Hasselmann, P. H. and Ip, W-H. and Keller, H. U. and Lara, L. M. and Lopez Moreno, J. and Marzari, F. and Massironi, M. and penasa, L. and Shi, X. (2018) The backscattering ratio of comet 67P/Churyumov-Gerasimenko dust coma as seen by OSIRIS onboard Rosetta. Monthly Notices of the Royal Astronomical Society, 482, pp. 2924-2933. Oxford University Press. DOI: 10.1093/mnras/sty2843 ISSN 0035-8711

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Official URL: https://doi.org/10.1093/mnras/sty2843


Remote sensing observations of dust particles ejected from comets provide important hints on the intimate nature of the materials composing these primitive objects. The measurement of dust coma backscattering ratio, BSR, defined as the ratio of the reflectance at phase angle 0° and 30°, helps tuning theoretical models aimed at solving the inverse scattering problem deriving information on the nature of the ejected particles. The Rosetta/OSIRIS camera sampled the coma phase function of comet 67P, with four series acquired at low phase angles from 2015 January to 2016 May. We also added previously published data to our analysis to increase the temporal resolution of our findings. We measured a BSR in the range ∼ [1.7–3.6], broader than the range found in literature from ground-based observations of other comets. We found that during the post-perihelion phase, the BSR is systematically larger than the classical cometary dust values only for nucleocentric distances smaller than ∼100 km. We explain this trend in terms of a cloud of chunks orbiting the nucleus at distances <100 km ejected during perihelion and slowly collapsing on the nucleus over a few months because of the coma gas drag. This also implies that the threshold particle size for the dust phase function to become similar to the nucleus phase function is between 2.5 mm and 0.1 m, taking into account previous Rosetta findings.

Item URL in elib:https://elib.dlr.de/124815/
Document Type:Article
Title:The backscattering ratio of comet 67P/Churyumov-Gerasimenko dust coma as seen by OSIRIS onboard Rosetta
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bertini, I.Dipartimento di Astronomia, Università di Padova, Padova, ItalyUNSPECIFIED
La Forgia, FiorangelaUniversity of Padova, Department of Physics and Astronomy, Vicolo dell'Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Tubiana, C.Max-Planck-Institut fuer Sonnensystemforschung, GermanyUNSPECIFIED
Güttler, C.Max-Planck-Institut für SonnensystemforschungUNSPECIFIED
Moreno, F.Instituto de Astrofísica de Andalucía, Consejo Superior de Investigaciones Científicas (CSIC), P.O. Box 3008, 18080 Granada, SpainUNSPECIFIED
Agarwal, J.Max-Planck-Institut für SonnensystemforschungUNSPECIFIED
Munoz, O.Institute of Astrophysics of Andalusia – CSIC, Glorieta de la AstronomiaUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Ivanovsky, S.Istituto di Astrofisica e Planetologia Spaziali, INAF, Via fosso del cavaliereUNSPECIFIED
Pajola, M.CISAS - Center for Studies and Activities for Space, University of PadovaUNSPECIFIED
Lucchetti, A.center of studies and activities for space, cisas, g. colombo, university of padova, via venezia 15, 35131, padova, italyUNSPECIFIED
Petropoulou, V.Center of Studies and Activities for Space, CISAS, ‘G. Colombo’, UniversityUNSPECIFIED
Lazzarin, M.Department of Astronomy, University of PaduaUNSPECIFIED
Rotundi, A.University of Naples, Naples, ItalyUNSPECIFIED
Bodewits, DennisDepartment of Astronomy, University of Maryland, College Park, MD 20742-2421, USAUNSPECIFIED
Frattin, E.INAF Osservatorio Astronomico di Padova, Padova, ItalyUNSPECIFIED
Toth, I.Konkoly Observatory, MTA CSFK CSIUNSPECIFIED
Masoumzadeh, NafisehMax Planck Institute for Solar System Research, Katlenburg-Lindau, GermanyUNSPECIFIED
Kovacs, G.Max–Planck–Institut für Sonnensystemforschung, Justus–von–UNSPECIFIED
Rinaldi, G.INAF – Istituto di Fisica dello Spazio Interplanetario, via del Fosso del Cavaliere 100, 00133 Roma, ItalyUNSPECIFIED
Guirado, D.Istituto di Astrofisica e Planetologia Spaziali, INAF, Via fosso del cavaliereUNSPECIFIED
Sierks, H.Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, GermanyUNSPECIFIED
Naletto, G.Università di Padova, Departimento di Elettronica et Informatica, Padova, ItalyUNSPECIFIED
Lamy, P.Laboratoire d'Astronomie Spatiale, Marseille, FranceUNSPECIFIED
Rodrigo, R.Instituto de Astrofísica de Andalucía – CSIC, Granada, SpainUNSPECIFIED
Koschny, D.Research and Scientific Support Department, European Space Agency, 2201 Noordwijk, The NetherlandsUNSPECIFIED
Davidsson, B.Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, SwedenUNSPECIFIED
Barbieri, C.University of Padova, Padova, ItalyUNSPECIFIED
Barucci, M. A.LESIA, Obs. de Paris, CNRS, Univ Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195 Meudon, FranceUNSPECIFIED
Bertaux, J.-L.Laboratoire Atmosphères, Milieux, Observations Spatiales, CNRS/UVSQ/UPMC, 11 boulevard d’Alembert, 78280 Guyancourt, FranceUNSPECIFIED
Cambianica, P.University of Padova, Padova, ItalyUNSPECIFIED
Cremonese, G.Osservatorio Astronomico, Padova, ItalyUNSPECIFIED
Da Deppo, V.Consiglio Nazionale delle Ricerche-Istituto Nazionale per la Fisica della Materia, Luxor, Padova, ItalyUNSPECIFIED
Debei, S.Università di Padova, Center of Studies and Activities of Space (CISAS) "G.Colombo", Padova, ItalyUNSPECIFIED
De Cecco, M.Università di Padova, Center of Studies and Activities of Space (CISAS) "G.Colombo", Padova, ItalyUNSPECIFIED
Deller, J.Max-Planck Institut für Sonnensystemforschung, Goettingen, GermanyUNSPECIFIED
Ferrari, SabrinaDipartimento di Geoscienze, Università degli studi di Padova, ItalyUNSPECIFIED
Ferri, F.University of Padova, Padova, ItalyUNSPECIFIED
Fornasier, S.Observatoire de Paris-Meudon, FranceUNSPECIFIED
Gutierrez, P.J.IAA-CSIC, Granada, SpainUNSPECIFIED
Hasselmann, P. H.LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIED
Ip, W-H.Institute for Space Science, National Central University, Chung Li, TaiwanUNSPECIFIED
Keller, H. U.horst.keller (at) dlr.deUNSPECIFIED
Lara, L. M.Instituto de Astrofisica de Andalucia, CSIC, Granada, SpainUNSPECIFIED
Lopez Moreno, J.Instituto de Astrofifica de Andalucia-Consejo Superior de Investigaciones Cientificas, Granada, SpainUNSPECIFIED
Marzari, F.Università di Padova, Departimento di Fisica, Padova, ItalyUNSPECIFIED
Massironi, M.University of Padova, ItalyUNSPECIFIED
penasa, L.center of studies and activities for Space CISAC, PadovaUNSPECIFIED
Shi, X.Technical University Berlin, Germany ; Shanghai Astronomical Observatory, Shanghai, China,UNSPECIFIED
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1093/mnras/sty2843
Page Range:pp. 2924-2933
Publisher:Oxford University Press
Keywords:scattering, methods: data analysis, techniques: image processing, techniques: photometric, comets: individual: 67P/Churyumov–Gerasimenko
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, R - Projekt ROSETTA Lander
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Stiebeler, Ulrike
Deposited On:12 Dec 2018 12:42
Last Modified:06 Sep 2019 15:17

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