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

Davidsson, B.J.R., Gutierrez, P.J., Sierks, H., Barbieri, C., Lamy, P.L., Rodrigo, R., Koschny, D., Rickman, H., Keller, H.U., Agarwal, J., and others. (2015) Orbital elements of the material surrounding comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics, 583 . (A16) 1-9. ISSN 0004-6361. (doi:10.1051/0004-6361/201525841) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://www.dx.doi.org/10.1051/0004-6361/201525841

Abstract

We investigate the dust coma within the Hill sphere of comet 67P/Churyumov-Gerasimenko. 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.

Item Type: Article
DOI/Identification number: 10.1051/0004-6361/201525841
Uncontrolled keywords: Astrometry, Celestial mechanics, Comets: individual: 67P/Churyumov-Gerasimenko, Astrophysics, Photometry, Space flight, 67p/churyumov-gerasimenko, Astrometry, Celestial mechanics, Comets: individual: 67P/Churyumov-Gerasimenko, European Space Agency, Improvement technique, Orbit determination, Osculating orbital elements, Orbits
Subjects: Q Science > QB Astronomy
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Stephen Lowry
Date Deposited: 23 Nov 2015 15:11 UTC
Last Modified: 29 May 2019 16:29 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52261 (The current URI for this page, for reference purposes)
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