Orbital elements of the material surrounding comet 67P/Churyumov-Gerasimenko

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101696

Title:	Orbital elements of the material surrounding comet 67P/Churyumov-Gerasimenko
Authors:	葉永烜;Davidsson, B. J. R.;Gutiérrez, P. J.;Sierks, H.;Barbieri, C.;Lamy, P. L.;Rodrigo, R.;Koschny, D.;Rickman, H.;Keller, H. U.;Agarwal, J.;A’Hearn, M. F.;Barucci, M. A.;Bertaux, J.-L.;Bertini, I.;Bodewits, D.;Cremonese, G.;Da Deppo, V.;Debei, S.;De Cecco, M.;Fornasier, S.;Fulle, M.;Groussin, O.;Güttler, C.;Hviid, S. F.;Ip, W.-H.;Jorda, L.;Knollenberg, J.;Kovacs, G.;Kramm, J.-R.;Kührt, E.;Küppers, M.;La Forgia, F.;Lara, L. M.;Lazzarin, M.;Lopez Moreno, J. J.;Lowry, S.;Magrin, S.;Marzari, F.;Michalik, H.;Moissl-Fraund, R.;Naletto, G.;Oklay, N.;Pajola, M.;Snodgrass, C.;Thomas, N.;Tubiana, C.;Vincent, J.-B.
Contributors:	理學院天文研究所
Keywords:	astrometry;Astronomy and Astrophysics;Astrophysics;celestial mechanics;Clouds;Comet heads;Comet nuclei;Comets;comets: individual: 67P/Churyumov-Gerasimenko;Earth and Planetary Astrophysics;Grains;Orbital elements;Orbits;Photometry;Sciences of the Universe;Space and Planetary Science
Date:	2015-11-01
Issue Date:	2026-04-21 14:41:06 (UTC+8)
Publisher:	EDP Sciences
Abstract:	摘要： 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. 出版者： EDP Sciences 出版日期： 2015-11-01 出處： Astronomy & Astrophysics, 2015-11, Vol.583, p.A16- 資源來源： EDP Sciences 版權： CC0 1.0 - Universal 識別號： ISSN: 0004-6361 識別號： ISSN: 1432-0746 識別號： EISSN: 1432-0746 識別號： DOI: 10.1051/0004-6361/201525841
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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