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  Spectrophotometric variegation of the layering in comet 67P/Churyumov-Gerasimenko as seen by OSIRIS

Tognon, G., Ferrari, S., Penasa, L., La Forgia, F., Massironi, M., Naletto, G., et al. (2019). Spectrophotometric variegation of the layering in comet 67P/Churyumov-Gerasimenko as seen by OSIRIS. Astronomy and Astrophysics, 630: A16. doi:10.1051/0004-6361/201834884.

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Tognon, G., Author
Ferrari, S., Author
Penasa, L., Author
La Forgia, F., Author
Massironi, M., Author
Naletto, G., Author
Lazzarin, M., Author
Cambianica, P., Author
Lucchetti, A., Author
Pajola, M., Author
Ferri, F., Author
Güttler, Carsten1, Author              
Davidsson, B., Author
Deshapriya, P., Author
Fornasier, S., Author
Mottola, S., Author
Tóth, I., Author
Sierks, Holger1, Author              
Lamy, P. L., Author
Rodrigo, R., Author
Koschny, D., AuthorBarbieri, C., AuthorBarucci, M. A., AuthorBertaux, J.-L., AuthorBertini, I., AuthorBodewits, D., AuthorCremonese, G., AuthorDa Deppo, V. , AuthorDebei, S., AuthorDe Cecco, M. , AuthorDeller, Jakob1, Author              Franceschi, M., AuthorFrattin, E., AuthorFulle, M., AuthorGutiérrez, P. J.2, AuthorIp, W.-H., AuthorKeller, H. U., AuthorLara, L. M., AuthorLópez-Moreno, J. J., AuthorMarzari, F., AuthorPetropoulou, V., AuthorShi, Xian1, Author              Tubiana, Cecilia1, Author               more..
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              
2Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1832289              


Free keywords: comets: general / comets: individual: 67P/Churyumov-Gerasimenko / methods: data analysis
 Abstract: Context. Between August 2014 and September 2016, the ESA space mission Rosetta escorted comet 67P/Churyumov-Gerasimenko (67P) during its perihelion passage. The onboard OSIRIS Narrow Angle Camera (NAC) acquired high-resolution multispectral images of the cometary surface. These datasets allowed a characterization of the spectrophotometric variegation of the layering of the large lobe, correlated with the layer structural elevation. Aims. We perform a spectrophotometric characterization of the outcropping stratification of the small lobe of 67P as a function of its structural elevation, and consequently, a spectrophotometric comparison of the layered outcrops of the two lobes. Methods. We selected two sequences of post-perihelion OSIRIS NAC images (~2.4 au outbound tothe Sun), from which we built up two multispectral images, framing an extended geological section of the onion-like stratification of the small lobe. Then we classified the consolidated areas of the outcropping and the relative coarse deposits that were identified in the multispectral data with a two-class maximum likelihood method. For this, we defined the classes as a function of the structural elevation of the surface. Results. As a result, we identified a brightness variegation of the surface reflectance that is correlated with the structural elevation. The outer class, which is located at higher elevations, appears darker than the inner class. This fits previously obtained results for the large lobe. The reflectance values of the nucleus of 67P tend to decrease with increasing structural elevation. Conclusions. The observed spectrophotometric variegation can be due to a different texture as well as to a different content of volatiles and refractories. We suggest that the outer outcrops appear darker because they have been exposed longer, and the inner outcrops appear brighter because the surface has been more effectively rejuvenated. We interpret this variegation as the result of an evolutionary process.


Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/201834884
 Degree: -



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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 630 Sequence Number: A16 Start / End Page: - Identifier: Other: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1