Models of Rosetta/OSIRIS 67P Dust Coma Phase Function

F. Moreno, D. Guirado, O. Munoz, I. Bertini, C. Tubiana, C. Güttler, M. Fulle, A. Rotundi, V. Della Corte, S. L. Ivanovski, G. Rinaldi, D. Bockelée-Morvan, V. V. Zakharov, J. Agarwal, S. Mottola, I. Toth, E. Frattin, L. M. Lara, P. J. Gutiérrez, Z. Y. LinL. Kolokolova, H. Sierks, G. Naletto, P. L. Lamy, R. Rodrigo, D. Koschny, B. Davidsson, M. A. Barucci, J. L. Bertaux, D. Bodewits, G. Cremonese, V. Da Deppo, S. Debei, M. De Cecco, J. Deller, S. Fornasier, W. H. Ip, H. U. Keller, M. Lazzarin, J. J. López-Moreno, F. Marzari, X. Shi

研究成果: 雜誌貢獻期刊論文同行評審

17 引文 斯高帕斯(Scopus)

摘要

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.

原文???core.languages.en_GB???
文章編號237
期刊Astronomical Journal
156
發行號5
DOIs
出版狀態已出版 - 11月 2018

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