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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, F and Fulle, M. and Tubiana, C. and Güttler, C. and Moreno, F. and Agarwal, J. and Munoz, O. and Mottola, S. and Ivanovski, S. and Pajola, M. and Lucchetti, A. and Petropoulou, V. and Lazzari, M. and Rotundi, A. and Bodewits, D. and Frattin, E. and Toth, I. and Masoumzadeh, N 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, S. and Ferri, F. and Fornasier, S. and Gutiérrez, P.J. and Hasselmann, P.H. and Ip, W-H. and Keller, H.U. and Lara, L.M. and Moreno, J.J. Lopez and Marzari, F. and Massironi, M. and Penasa, L. and Shi, X. (2019) 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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Abstract

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/131577/
Document Type:Article
Title:The backscattering ratio of comet 67P/Churyumov-Gerasimenko dust coma as seen by OSIRIS onboard Rosetta
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bertini, I.dipartimento di astronomia, università di padova, padova, italyUNSPECIFIED
La Forgia, FDepartment of Physics and Astronomy “G. Galilei”, University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Fulle, M.INAF - Osservatorio Astronomico di Trieste, Trieste, ItalyUNSPECIFIED
Tubiana, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Güttler, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Moreno, F.Instituto de Astrofísica de Andalucía – CSIC, 18080 Granada, SpainUNSPECIFIED
Agarwal, J.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Munoz, O.Instituto de Astrofisica de Andalucia, CSIC, c/ Glorieta de la Astronomia s/n, 1800, Granada, SpainUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.dehttps://orcid.org/0000-0002-0457-3872
Ivanovski, S.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), Via Fosso del Cavaliere, 100, 0133 Rome, ItalyUNSPECIFIED
Pajola, M.INAF Osservatorio Astronomico di Padova, Padova , ItalyUNSPECIFIED
Lucchetti, A.Center of Studies and Activities for Space (CISAS) ‘G. Colombo’, Univer-UNSPECIFIED
Petropoulou, V.Center of Studies and Activities for Space, CISAS, ‘G. Colombo’, UniversityUNSPECIFIED
Lazzari, M.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Rotundi, A.INAF - Istituto di Astrofisica e Planetologia Spaziali, Area Ricerca Tor Vergata, Via Fosso del Cavaliere 100, 00133 Rome, ItalyUNSPECIFIED
Bodewits, D.Physics Department, Auburn University, Auburn, AL 36849, USAUNSPECIFIED
Frattin, E.INAF, Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5,UNSPECIFIED
Toth, I.Konkoly Observatory, MTA CSFK CSI, 1525 Budapest, HungaryUNSPECIFIED
Masoumzadeh, NMax-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Kovacs, G.Max-Planck Institut fuer Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Goettingen, GermanyUNSPECIFIED
Rinaldi, G.INAF – Istituto di Fisica dello Spazio Interplanetario, via del Fosso del Cavaliere 100, 00133 Roma, ItalyUNSPECIFIED
Guirado, D.Instituto de Astrofisica de Andalucia, CSIC, c/ Glorieta de la Astronomia s/n, 1800, Granada, SpainUNSPECIFIED
Sierks, H.Max-Planck Institut fuer Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Goettingen, GermanyUNSPECIFIED
Naletto, G.Centro di Ateneo di Studi ed Attività Spaziali, "Giuseppe Colombo" (CISAS), University of Padova, via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Lamy, P.Aix Marseille Université, CNRS, LAM (Laboratoire d’Astro- physique de Marseille) UMR 7326, 13388, Marseille, FranceUNSPECIFIED
Rodrigo, R.Centro de Astrobiologia (INTA-CSIC), 28850 Torrejan de Ardoz, Madrid, SpainUNSPECIFIED
Koschny, D.Research and Scientific Support Department, Directorate of Science and Robotic Exploration, ESA ESTEC, The NetherlandsUNSPECIFIED
Davidsson, B.Jet Propulsion Laboratory, M/S 183–401, 4800 Oak Grove Drive, Pasadena, CA 91109, USAUNSPECIFIED
Barbieri, C.University of Padova, Department of Physics and Astronomy, vicolo dell’Osservatorio 3, 35122, Padova, ItalyUNSPECIFIED
Barucci, M.A.LESIA - Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 92195 Meudon, FranceUNSPECIFIED
Bertaux, J-L.laboratoire atmosphères, milieux, observations spatiales, cnrs/uvsq/upmc, 11 boulevard d’alembert, 78280 guyancourt, franceUNSPECIFIED
Cambianica, P.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Cremonese, G.INAF-Astronomical Observatory of Padova, Vicolo dell’Osservatorio 5, 35131 Padova, e-mail: gabriele.cremonese (at) oapd.inaf.itUNSPECIFIED
Da Deppo, V.CNR-IFN UOS Padova LUXOR, via Trasea 7, 35131, Padova, ItalyUNSPECIFIED
Debei, S.Università di Padova, Center of Studies and Activities of Space (CISAS) "G.Colombo", Padova, ItalyUNSPECIFIED
De Cecco, M.UNITN, University of Trento, via Mesiano 77, 38100, Trento, ItalyUNSPECIFIED
Deller, J.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3,UNSPECIFIED
Ferrari, S.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Ferri, F.Center of Studies and Activities for Space (CISAS) ‘G. Colombo’, Univer-UNSPECIFIED
Fornasier, S.LESIA, Obs. de Paris, CNRS, Univ Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195 Meudon, FranceUNSPECIFIED
Gutiérrez, P.J.Instituto de Astrofisica de Andalucia-CSIC, Glorieta de la Astrono- mia, 18008 Granada, SpainUNSPECIFIED
Hasselmann, P.H.LESIA - Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 92195 Meudon, 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, Glorieta de la Astrono- mia, 18008 Granada, Spain, e-mail: lara (at) iaa.csic.esUNSPECIFIED
Moreno, J.J. Lopezinstituto de astrofisica de andalucia csic, glorieta de la astronomia, 18008, granada, spainUNSPECIFIED
Marzari, F.Department of Physics and Astronomy “G. Galilei”, University of Padova, ItalyUNSPECIFIED
Massironi, M.Dipartimento di Geoscienze, University of Padova, via G. Gradenigo 6, 35131 Padova, ItalyUNSPECIFIED
Penasa, L.Center of Studies and Activities for Space (CISAS) ‘G. Colombo’, Univer-UNSPECIFIED
Shi, X.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Date:2019
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:482
DOI :10.1093/mnras/sty2843
Page Range:pp. 2924-2933
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
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
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:02 Dec 2019 15:24
Last Modified:24 Mar 2020 13:09

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