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  A comparison of multiple Rosetta data sets and 3D model calculations of 67P/Churyumov-Gerasimenko coma around equinox (May 2015)

Marschall, R., Rezac, L., Kappel, D., Su, C., Gerig, S.-B., Rubin, M., et al. (2019). A comparison of multiple Rosetta data sets and 3D model calculations of 67P/Churyumov-Gerasimenko coma around equinox (May 2015). Icarus, 328, 104-126. doi:10.1016/j.icarus.2019.02.008.

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 Creators:
Marschall, R., Author
Rezac, Ladislav1, Author              
Kappel, D., Author
Su, C.C., Author
Gerig, S.-B., Author
Rubin, M., Author
Pinzón-Rodríguez, O., Author
Marshall, David W.1, Author              
Liao, Y., Author
Herny, C., Author
Arnold, G., Author
Christou, C., Author
Dadzie, S.K., Author
Groussin, O., Author
Hartogh, Paul1, Author              
Jorda, L., Author
Kührt, E., Author
Mottola, S., Author
Mousis, O., Author
Preusker, F., Author
Scholten, F., AuthorTheologou, P., AuthorWu, J.-S., AuthorAltwegg, K., AuthorRodrigo, R., AuthorThomas, N., Author more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: Comets 67P/Churyumov-Gerasimenko Coma Dust Dynamics
 Abstract: We have used the latest available shape model for gas and dust simulations of the inner coma of comet 67P/Churyumov-Gerasimenko for the period around May 2015 (equinox). We compare results from a purely insolation-driven model with a complementary set of observations made by ROSINA, VIRTIS, MIRO, and OSIRIS within the same period. The observations include - for the first time - inverted MIRO measurements of gas density, temperature and bulk velocity to constrain the model. The comparisons show that, as in November 2014 (Marschall et al., 2016), insolation-driven activity does not provide an adequate fit to the data. Both VIRTIS and MIRO observations indicate that emissions from the Hatmehit and Imhotep regions of the nucleus are strongly depleted in total gas, H2O, and dust emissions in this case. The MIRO inversion provides a challenging constraint to the models as a consequence of the terminator orbit and nucleus pointing of the spacecraft. Nonetheless a consistent picture with a dominance of outgassing from the Hapi region, even at equinox, is clearly evident. An inhomogeneous model consistent with models proposed for the November 2014 time-frame was constructed and provides a better fit to the data. As far as we are aware this is the first time comae data from four Rosetta instruments have been used to constrain within one self-contained model the emission distribution at the nucleus surface and study the dynamics of the gas and dust outflow.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.icarus.2019.02.008
 Degree: -

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Title: Icarus
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 328 Sequence Number: - Start / End Page: 104 - 126 Identifier: ISSN: 0019-1035
CoNE: https://pure.mpg.de/cone/journals/resource/954922645023