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Comet 67P/Churyumov-Gerasimenko rotation changes derived from sublimation-induced torques

Kramer, T. and Läuter, M. and Hviid, Stubbe and Jorda, L. and Keller, H. U. and Kührt, Ekkehard (2019) Comet 67P/Churyumov-Gerasimenko rotation changes derived from sublimation-induced torques. Astronomy & Astrophysics, 630, A3. EDP Sciences. DOI: 10.1051/0004-6361/201834349 ISSN 0004-6361

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Official URL: https://www.aanda.org/articles/aa/abs/2019/10/aa34349-18/aa34349-18.html


Context. The change in rotation period and the orientation of the rotation axis of comet 67P/Churyumov-Gerasimenko (67P) can be deduced with high precision from images taken by the scientific imaging instruments on board the Rosetta mission. Non-gravitational forces are a natural explanation for these data. Aims. We describe observed changes in orientation of the rotation axis and the rotation period of 67P. We explain them based on a sublimation model with a best fit for the surface active fraction (model P). Torque effects of periodically changing gas emissions on the surface are considered. Methods. We solved the equation of state for the angular momentum in the inertial and the body-fixed frames and provide an analytic theory of the rotation changes in terms of Fourier coefficients, which are generally applicable to periodically forced rigid-body dynamics. Results. The torque-induced changes in rotation state constrain the physical properties of the surface, the sublimation rate, and the local active fraction of the surface. Conclusions. We determine a distribution of the local surface active fraction in agreement with the rotation properties, period, and orientation of 67P. The torque movement confirms that the sublimation increases faster than the insolation toward perihelion. The derived relatively uniform activity pattern is discussed in terms of related surface features.

Item URL in elib:https://elib.dlr.de/131870/
Document Type:Article
Title:Comet 67P/Churyumov-Gerasimenko rotation changes derived from sublimation-induced torques
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kramer, T.Zuse Institute Berlin, Supercomputing Division, Takustr. 7, 14195 Berlin, GermanyUNSPECIFIED
Läuter, M.Zuse Institute Berlin, Supercomputing Division, Takustr. 7, 14195 Berlin, GermanyUNSPECIFIED
Hviid, StubbeStubbe.Hviid (at) dlr.deUNSPECIFIED
Jorda, L.Laboratoire d’Astrophysique de Marseille, UMR7326 CNRS/Université Aix-Marseille, 38 rue Frédéric Joliot-Curie,UNSPECIFIED
Keller, H. U.horst.keller (at) dlr.deUNSPECIFIED
Kührt, EkkehardEkkehard.Kuehrt (at) dlr.deUNSPECIFIED
Date:7 January 2019
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1051/0004-6361/201834349
Page Range:A3
Publisher:EDP Sciences
Keywords:67P/Churyumov-Gerasimenko Comets Rosetta Rotation Activity
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: Hviid, Stubbe
Deposited On:04 Dec 2019 12:43
Last Modified:04 Dec 2019 12:43

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