Characterization of OSIRIS NAC filters for the interpretation of multispectral data of comet 67P/Churyumov-Gerasimenko

Nilda Oklay 1 Jean-Baptiste Vincent 1 Holger Sierks 1 Sébastien Besse 2 Maurizio Pajola 3 Ivano Bertini 3 Hans Rickman 4, 5 Fiorangela La Forgia 6 Antonella M. Barucci 7 Sonia Fornasier 7 Cesare Barbieri 3, 6 Detlef Koschny 2 Philippe Lamy 8 Rafael Rodrigo 9, 10 Jessica Agarwal 1 Michael F. A'Hearn 11 Jean-Loup Bertaux 12 Gabriele Cremonese 13 Vania Da Deppo 14 Björn Davidsson 4 Stefano Debei 15 Mariolino De Cecco 16 Marco Fulle Olivier Groussin 8 Pedro J. Gutierrez 17 Carsten Güttler 1 Stubbe F. Hviid 18 Wing-Huen Ip 19 Laurent Jorda 8 Horst U. Keller 20 Jörg Knollenberg 18 J.-Rainer Kramm 1 Ekkerhard Kührt 21 Michael Küppers 22 Luisa M. Lara 17 Monica Lazzarin 6 Josè J. Lopez Moreno 17 Francesco Marzari 6 Harald Michalik 23 Giampiero Naletto 14, 3, 24 Nicholas Thomas 25 Cécilia Tubiana 1
Abstract : We interpret multicolor data from OSIRIS NAC for the remote-sensing exploration of comet 67P/Churyumov-Gerasimenko. We determine the most meaningful definition of color maps for the characterization of surface variegation with filters available on OSIRIS NAC. We analyzed laboratory spectra of selected minerals and olivine-pyroxene mixtures seen through OSIRIS NAC filters, with spectral methods existing in the literature: reflectance ratios, minimum band wavelength, spectral slopes, band tilt, band curvature, and visible tilt. We emphasize the importance of reflectance ratios and particularly the relation of visible tilt vs. band tilt. This technique provides a reliable diagnostic of the presence of silicates. Color maps constructed by red-green-blue colors defined with the green, orange, red, IR, and Fe2O3 filters let us define regions that may significantly differ in composition.
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https://hal.archives-ouvertes.fr/hal-01439987
Contributeur : Christian Surace <>
Soumis le : mercredi 18 janvier 2017 - 20:06:03
Dernière modification le : jeudi 9 novembre 2017 - 09:36:02

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Nilda Oklay, Jean-Baptiste Vincent, Holger Sierks, Sébastien Besse, Maurizio Pajola, et al.. Characterization of OSIRIS NAC filters for the interpretation of multispectral data of comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 583, A45 (12 p.). 〈10.1051/0004-6361/201525994〉. 〈hal-01439987〉

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