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Possible interpretation of the precession of comet 67P/Churyumov-Gerasimenko

Gutierrez, P.J. and Jorda, L and Gaskell, R.W. and Davidsson, B. J. R. and Capanna, C. and Hviid, Stubbe and Keller, H. U. and Maquet, L. and Mottola, Stefano and Preusker, Frank and Scholten, Frank and Lara López, Luisa M. and Moreno, F. and Rodrigo, R. and Sierks, H. and Barbieri, C. and Lamy, P. L. and Koschny, Detlef and Rickman, H. and Agarwal, J. and A'Hearn, M. F. and Auger, Anne-Therese and Barucci, M. A. and Bertaux, Jean-Loup and Bertini, I. and Cremonese, G. and Da Deppo, V. and Debei, S. and De Cecco, M. and El-Maarry, M. R. and Fornasier, S. and Fulle, M. and Groussin, Olivier and Gutierrez-Marques, P. and Güttler, C. and Ip, Wing-Huen and Knollenberg, Jörg and Kramm, J. R. and Kührt, Ekkehard and Küppers, Michael and La Forgia, Fiorangela and Lazzarin, Monica and Lopez-Moreno, J. J. and Magrin, S. and Marchi, Simone and Marzari, F. and Naletto, G. and Oklay, N. and Pajola, Maurizio and Pommerol, Antoine and Sabau, D. and Thomas, N. and Toth, I. and Tubiana, C. and Vincent, J.B. (2016) Possible interpretation of the precession of comet 67P/Churyumov-Gerasimenko. Astronomy & Astrophysics. EDP Sciences. DOI: 10.1051/0004-6361/201528029 ISSN 0004-6361

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Abstract

Context. Data derived from the reconstruction of the nucleus shape of comet 67P/Churyumov-Gerasimenko (67P) from images of the OSIRIS camera onboard ROSETTA show evidence that the nucleus rotates in complex mode. First, the orientation of the spin axis is not fixed in an inertial reference frame, which suggests a precessing motion around the angular momentum vector with a periodicity of approximately 257 h ± 12 h.Second, periodograms of the right ascension and declination (RA/Dec) coordinates of the body-frame Z axis show a very significant (higher than 99.99%) periodicity at 276 h ± 12 h, different from the rotational period of 12.40 h as previously determined from light-curve analysis. Aims. The main goal is to interpret the data and associated periodicities of the spin axis orientation in space. Methods. We analyzed the spin axis orientation in space and associated periodicities and compared them with solutions of Euler equations under the assumption that the body rotates in torque-free conditions. Statistical tests comparing the observationally derived spin axis orientation with the outcome from simulations were applied to determine the most likely inertia moments, excitation level, and periods. Results. Under the assumption that the body is solid-rigid and rotates in torque-free conditions, the most likely interpretation is that 67P is spinning around the principal axis with the highest inertia moment with a period of about 13 h. At the same time, the comet precesses around the angular momentum vector with a period of about 6.35 h. While the rotating period of such a body would be about 12.4 h, RA/Dec coordinates of the spin axis would have a periodicity of about 270 h as a result of the combination of the two aforementioned motions. Conclusions. The most direct and simple interpretation of the complex rotation of 67P requires a ratio of inertia moments significantly higher than that of a homogeneous body.

Item URL in elib:https://elib.dlr.de/109895/
Document Type:Article
Title:Possible interpretation of the precession of comet 67P/Churyumov-Gerasimenko
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gutierrez, P.J.IAA-CSIC, Granada, SpainUNSPECIFIED
Jorda, LLAM, MarseilleUNSPECIFIED
Gaskell, R.W.Planetary Science Institute, Tucson, AZ, USAUNSPECIFIED
Davidsson, B. J. R.Department of Astronomy a. Space Physics, UppsalaUNSPECIFIED
Capanna, C.Laboratoire d'Astrophysique de Marseille, FranceUNSPECIFIED
Hviid, StubbeStubbe.Hviid (at) dlr.deUNSPECIFIED
Keller, H. U.IGEP TU BraunschweigUNSPECIFIED
Maquet, L.IMCCE, Observatoire de Paris, UMR8028 CNRS, F-75014 Paris, FranceUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Scholten, FrankFrank.Scholten (at) dlr.deUNSPECIFIED
Lara López, Luisa M.IAA-CSIC Granada, SpainUNSPECIFIED
Moreno, F.Instituto de Astrofísica de Andalucía, Consejo Superior de Investigaciones Científicas (CSIC), P.O. Box 3008, 18080 Granada, SpainUNSPECIFIED
Rodrigo, R.Centro de Astrobiologa, CSIC-INTA, 28850 Torrejon de Ardoz, Madrid, Spain; International Space Science Institute, Hallerstrasse 6, 3012, Bern, SwitzerlandUNSPECIFIED
Sierks, H.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Barbieri, C.University of Padova, Padova, ItalyUNSPECIFIED
Lamy, P. L.Aix-Marseille Universite, CNRS, LAMUNSPECIFIED
Koschny, DetlefESTEC, The NetherlandsUNSPECIFIED
Rickman, H.Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden; PAS Space Research Center, Bartycka 18A, 00-716 Warsaw, PolandUNSPECIFIED
Agarwal, J.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
A'Hearn, M. F.University of Maryland, Department of Astronomy, Maryland, USAUNSPECIFIED
Auger, Anne-ThereseAix Marseille Université, CNRS, Laboratoire d’Astrophysique de Marseille, UMR 7326, 38 rue Frédéric Joliot-Curie, 13388 Marseille, France.UNSPECIFIED
Barucci, M. A.Observatoire de Paris, Meudon, FranceUNSPECIFIED
Bertaux, Jean-LoupLATMOS, CNRS/UVSQ/IPSL, 11 boulevard d'Alembert, 78280, Guyancourt, FranceUNSPECIFIED
Bertini, I.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Cremonese, G.Osservatorio Astronomico, Padova, ItalyUNSPECIFIED
Da Deppo, V.CNR-IFN UOS Padova LUXOR, via Trasea 7, 35131 Padova, ItalyUNSPECIFIED
Debei, S.Department of Industrial Engineering, University of Padova, Via Venezia 1, 35131 Padova, ItalyUNSPECIFIED
De Cecco, M.University of Trento, via Sommarive 9, 38123 Trento, ItalyUNSPECIFIED
El-Maarry, M. R.Physikalisches Institut, Sidlerstrasse 5, University of Bern, CH-3012 Bern, SwitzerlandUNSPECIFIED
Fornasier, S.Observatoire de Paris-Meudon, FranceUNSPECIFIED
Fulle, M.INAF - Osservatorio Astronomico di Trieste, Trieste, ItalyUNSPECIFIED
Groussin, OlivierLab. d'Astrophysique de Marseille, FranceUNSPECIFIED
Gutierrez-Marques, P.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
Ip, Wing-HuenNational Central University, Graduate Institute of Astronomy, 300 Chung-Da Road, Chung-Li 32054, TaiwanUNSPECIFIED
Knollenberg, JörgJoerg.Knollenberg (at) dlr.deUNSPECIFIED
Kramm, J. R.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Kührt, EkkehardEkkehard.Kuehrt (at) dlr.deUNSPECIFIED
Küppers, MichaelMax-Planck-Institut für SonnensystemforschungUNSPECIFIED
La Forgia, FiorangelaUniversity of Padova, Department of Physics and Astronomy, Vicolo dell'Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Lazzarin, MonicaUniversity of Padova, Department of Physics and Astronomy, Vicolo dell'Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Lopez-Moreno, J. J.Instituto de Astrofisica de Andalucia CSIC, Glorieta de la Astronomia, 18008, Granada, SpainUNSPECIFIED
Magrin, S.University of Padova, Department of Physics and Astronomy, viaUNSPECIFIED
Marchi, SimoneSolar System Exploration Research, Virtual Institute, Southwest Research Institute, 1050 Walnut St., Suite 300, Boulder, Colorado 80302, USAUNSPECIFIED
Marzari, F.Università di Padova, Departimento di Fisica, Padova, ItalyUNSPECIFIED
Naletto, G.Department of Information Engineering - University of Padova, Via Gradenigo 6, 35131 Padova, ItalyUNSPECIFIED
Oklay, N.Max-Planck-Institut für SonnensystemforschungUNSPECIFIED
Pajola, MaurizioCentro di Ateneo di Studi ed Attivitá Spaziali, “Giuseppe Colombo” (CISAS), University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIED
Pommerol, AntoinePhysikalisches Institut, Sidlerstrasse 5, University of Bern, 3012, Bern, SwitzerlandUNSPECIFIED
Sabau, D.Instituto Nacional de Tecnica Aerospacial, Carretera de Ajalvir, Madrid, SpainUNSPECIFIED
Thomas, N.University of Bern, SwitzerlandUNSPECIFIED
Toth, I.Konkoly Observatory, MTA CSFK CSIUNSPECIFIED
Tubiana, C.Max-Planck-Institut fuer Sonnensystemforschung, GermanyUNSPECIFIED
Vincent, J.B.Max-Planck-Institut fuer Sonnensystemforschung, GermanyUNSPECIFIED
Date:2016
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1051/0004-6361/201528029
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:comets: general / 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, R - Projekt ROSETTA Lander
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Schubert, Renate
Deposited On:21 Dec 2016 08:18
Last Modified:08 Mar 2018 18:23

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