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          Institute: MPI für Kernphysik     Collection: Interplanetary Dust Physics     Display Documents

ID: 276613.0, MPI für Kernphysik / Interplanetary Dust Physics
Modelling the large particle environment of comet 67P/Churyumov–Gerasimenko
Authors:Agarwal, Jessica; Müller, M.; Böhnhardt, H.; Grün, Eberhard
Research Context:Comet dust; Comet tail; Comet trail; Trail model; Large particles; 67P; Churyumov–Gerasimenko
Date of Publication (YYYY-MM-DD):2006
Title of Journal:Advances in Space Research
Issue / Number:9
Start Page:2049
End Page:2053
Copyright:© 2005 COSPAR Published by Elsevier Ltd.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:A method is presented to simulate images of a cometary dust trail in consistency with observed gas and dust production rates. It is also applicable to dust tails including neckline and antitail phenomena. Our main objective is to analyse the amount of mm-sized and larger particles within a given image. These are interesting to us because their emission by comets may constitute a major source of interplanetary dust. The model is applied to 67P/Churyumov–Gerasimenko, the target of ESA’s Rosetta mission. The employed parameters are consistent with a hydrodynamic coma model. Dust emitted during all apparitions of 67P since the Jupiter encounter in 1959 is taken into account. We compare simulated images with two images taken in May 2003 and April 2004. Both of these show a bright feature close to the projected orbit of the comet. We analyse the simulated images with respect to the age of the dust in this feature. We find that, within our model, the feature in 2003 is dominated by particles emitted during the same apparition. For 2004 we estimate that 25% of the intensity in the bright feature can be attributed to dust emitted during previous apparitions and 29% to particles emitted at true anomalies of (180 ± 5)° before observation. Concerning the sizes of dust grains in the bright feature, we find that in 2003, particles with radii between about 10 μm and 1 cm contribute nearly equally to the total intensity. In 2004 however, the structure is dominated by particles having sizes of 100 μm to 1 mm.
Free Keywords:Comet dust; Comet tail; Comet trail; Trail model; Large particles; 67P; Churyumov–Gerasimenko
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Independent Research Groups/Heidelberg Dust Research Group (R. Srama)
MPI für Sonnensystemforschung
External Affiliations:European Space Operations Centre, Robert-Bosch-Str. 5, 64293 Darmstadt, Germany
Hawaii Institute of Geophysics and Planetology, University of Hawaii, 1680 East West Road, POST 512c, Honolulu, HI 96822, USA
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