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  The scattering phase function of comet 67P/Churyumov–Gerasimenko coma as seen from the Rosetta/OSIRIS instrument

Bertini, I., La Forgia, F., Tubiana, C., Güttler, C., Fulle, M., Moreno, F., et al. (2017). The scattering phase function of comet 67P/Churyumov–Gerasimenko coma as seen from the Rosetta/OSIRIS instrument. Monthly Notices of the Royal Astronomical Society, 469(Suppl. 2), S404-S415. doi:10.1093/mnras/stx1850.

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Bertini, I., Author
La Forgia, F., Author
Tubiana, C., Author
Güttler, C., Author
Fulle, M., Author
Moreno, F., Author
Frattin, E., Author
Kovacs, G., Author
Pajola, M., Author
Sierks, Holger1, Author              
Barbieri, C., Author
Lamy, P., Author
Rodrigo, R., Author
Koschny, D., Author
Rickman, H., Author
Keller, H. U., Author
Agarwal, J., Author
A’Hearn, M. F., Author
Barucci, M. A., Author
Bertaux, J-L., Author
Bodewits, D., AuthorCremonese, G., AuthorDeppo, V. Da, AuthorDavidsson, B., AuthorDebei, S., AuthorCecco, M. De, AuthorDrolshagen, E., AuthorFerrari, S., AuthorFerri, F., AuthorFornasier, S., AuthorGicquel, A., AuthorGroussin, O., AuthorGutierrez, P. J., AuthorHasselmann, P. H., AuthorHviid, S. F., AuthorIp, W.-H., AuthorJorda, L., AuthorKnollenberg, J., AuthorKramm, J. R., AuthorKührt, E., AuthorKüppers, M., AuthorLara, L. M., AuthorLazzarin, M., AuthorLin, Z.-Y., AuthorMoreno, J. J. Lopez, AuthorLucchetti, A., AuthorMarzari, F., AuthorMassironi, M., AuthorMottola, S., AuthorNaletto, G., AuthorOklay, N., AuthorOtt, T., AuthorPenasa, L., AuthorThomas, N., AuthorVincent, J.-B., Author more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 MPIS_GROUPS: Planets and Comets
 MPIS_PROJECTS: ROSETTA: OSIRIS
 Abstract: The study of dust, the most abundant material in cometary nuclei, is pivotal in understanding the original materials forming the Solar system. Measuring the coma phase function provides a tool to investigate the nature of cometary dust. Rosetta/OSIRIS sampled the coma phase function of comet 67P/Churyumov–Gerasimenko, covering a large phase angle range in a small amount of time. Twelve series were acquired in the period from 2015 March to 2016 February for this scientific purpose. These data allowed, after stray light removal, measuring the phase function shape, its reddening, and phase reddening while varying heliocentric and nucleocentric distances. Despite small dissimilarities within different series, we found a constant overall shape. The reflectance has a u-shape with minimum at intermediate phase angles, reaching similar values at the smallest and largest phase angle sampled. The comparison with cometary phase functions in literature indicates OSIRIS curves being consistent with the ones found in many other single comets. The dust has a negligible phase reddening at α < 90°, indicating a coma dominated by single scattering. We measured a reddening of [11–14] %/100 nm between 376 and 744 nm. No trend with heliocentric or nucleocentric distance was found, indicating the coma doesn’t change its spectrum with time. These results are consistent with single coma grains and close-nucleus coma photometric results. Comparison with nucleus photometry indicates a different backscattering phase function shape and similar reddening values only at α < 30°. At larger phase angles, the nucleus becomes significantly redder than the coma.

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Language(s): eng - English
 Dates: 2017-12-142017
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stx1850
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 469 (Suppl. 2) Sequence Number: - Start / End Page: S404 - S415 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150