Orbital elements of the material surrounding comet 67P/Churyumov-Gerasimenko
Journal
Date Issued
2015
Author(s)
Davidsson, B. J. R.
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Gutiérrez, P. J.
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Sierks, H.
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Barbieri, C.
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Lamy, P. L.
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Rodrigo, R.
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Koschny, D.
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Rickman, H.
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Keller, H. U.
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Agarwal, J.
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A'Hearn, M. F.
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Barucci, M. A.
•
Bertaux, J. -L.
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Bertini, I.
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Bodewits, D.
•
•
Da Deppo, V.
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Debei, S.
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De Cecco, M.
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Fornasier, S.
•
•
Groussin, O.
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Güttler, C.
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Hviid, S. F.
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Ip, W. -H.
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Jorda, L.
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Knollenberg, J.
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Kovacs, G.
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Kramm, J. -R.
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Kührt, E.
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Küppers, M.
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La Forgia, F.
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Lara, L. M.
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Lazzarin, M.
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Lopez Moreno, J. J.
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Lowry, S.
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Magrin, S.
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Marzari, F.
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Michalik, H.
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Moissl-Fraund, R.
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Naletto, G.
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Oklay, N.
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•
Snodgrass, C.
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Thomas, N.
•
•
Vincent, J. -B.
Description
We are grateful to Herbert Raab for significant technical support on his software Astrometrica . OSIRIS was built by a consortium led by the Max–Planck–Institut für Sonnensystemforschung, Göttingen, Germany, in collaboration with CISAS, University of Padova, Italy, the Laboratoire d’Astrophysique de Marseille, France, the Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain, the Scientific Support Office of the European Space Agency, Noordwijk, The Netherlands, the Instituto Nacional de Técnica Aeroespacial, Madrid, Spain, the Universidad Politéchnica de Madrid, Spain, the Department of Physics and Astronomy of Uppsala University, Sweden, and the Institut für Datentechnik und Kommunikationsnetze der Technischen Universität Braunschweig, Germany. The support of the national funding agencies of Germany (DLR), France (CNES), Italy (ASI), Spain (MEC), Sweden (SNSB), and the ESA Technical Directorate is gratefully acknowledged. We thank the Rosetta Science Ground Segment at ESAC, the Rosetta Mission Operations Centre at ESOC and the Rosetta Project at ESTEC for their outstanding work that enabled the science return of the Rosetta Mission.
Abstract
Context. We investigate the dust coma within the Hill sphere of comet 67P/Churyumov-Gerasimenko. Aims: We aim to determine osculating orbital elements for individual distinguishable but unresolved slow-moving grains in the vicinity of the nucleus. In addition, we perform photometry and constrain grain sizes. Methods: We performed astrometry and photometry using images acquired by the OSIRIS Wide Angle Camera on the European Space Agency spacecraft Rosetta. Based on these measurements, we employed standard orbit determination and orbit improvement techniques. Results: Orbital elements and effective diameters of four grains were constrained, but we were unable to uniquely determine them. Two of the grains have light curves that indicate grain rotation. Conclusions: The four grains have diameters nominally in the range 0.14-0.50 m. For three of the grains, we found elliptic orbits, which is consistent with a cloud of bound particles around the nucleus. However, hyperbolic escape trajectories cannot be excluded for any of the grains, and for one grain this is the only known option. One grain may have originated from the surface shortly before observation. These results have possible implications for the understanding of the dispersal of the cloud of bound debris around comet nuclei, as well as for understanding the ejection of large grains far from the Sun.
Volume
583
Start page
A16
Issn Identifier
0004-6361
Ads BibCode
2015A&A...583A..16D
Rights
open.access
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