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  Models of Rosetta/OSIRIS 67P Dust Coma Phase Function

Moreno, F., Guirado, D., Muñoz, O., Bertini, I., Tubiana, C., Güttler, C., et al. (2018). Models of Rosetta/OSIRIS 67P Dust Coma Phase Function. The Astronomical Journal, 156(5): 237. doi:10.3847/1538-3881/aae526.

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 Creators:
Moreno, F., Author
Guirado, D., Author
Muñoz, O., Author
Bertini, I., Author
Tubiana, Cecilia1, Author           
Güttler, Carsten1, Author           
Fulle, M., Author
Rotundi, A., Author
Corte, V. Della, Author
Ivanovski, S. L., Author
Rinaldi, G., Author
Bockelée-Morvan, D., Author
Zakharov, V. V., Author
Agarwal, Jessica1, Author           
Mottola, S., Author
Toth, I., Author
Frattin, E., Author
Lara, L. M., Author
Gutiérrez, P. J., Author
Lin, Z. Y., Author
Kolokolova, L., AuthorSierks, Holger1, Author           Naletto, G., AuthorLamy, P. L., AuthorRodrigo, R., AuthorKoschny, D., AuthorDavidsson, B., AuthorBarucci, M. A., AuthorBertaux, J.-L., AuthorBodewits, D., AuthorCremonese, G., AuthorDeppo, V. Da, AuthorDebei, S., AuthorCecco, M. De, AuthorDeller, Jakob1, Author           Fornasier, S., AuthorIp, W.-H., AuthorKeller, H. U., AuthorLazzarin, M., AuthorLópez-Moreno, J. J., AuthorMarzari, F., AuthorShi, Xian1, 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: methods: numerical; minor planets, asteroids: individual (67P&Churyumov–Gerasimenko)
 MPIS_PROJECTS: ROSETTA: OSIRIS
 Abstract: The phase function of the dust coma of comet 67P has been determined from Rosetta/OSIRIS images. This function shows a deep minimum at phase angles near 100°, and a strong backscattering enhancement. These two properties cannot be reproduced by regular models of cometary dust, most of them based on wavelength-sized and randomly oriented aggregate particles. We show, however, that an ensemble of oriented elongated particles of a wide variety of aspect ratios, with radii r ≳ 10 μm, and whose long axes are perpendicular to the direction of the solar radiation, are capable of reproducing the observed phase function. These particles must be absorbing, with an imaginary part of the refractive index of about 0.1 to match the expected geometric albedo, and with porosity in the 60%–70% range.

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Language(s): eng - English
 Dates: 2018-11-282018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-3881/aae526
 Degree: -

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Title: The Astronomical Journal
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 156 (5) Sequence Number: 237 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_4