Characterization of OSIRIS NAC filters for the interpretation of multispectral data of comet 67P/Churyumov-Gerasimenko - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2015

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

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Nilda Oklay
  • Function : Author
  • PersonId : 976656
Jean-Loup Bertaux
  • Function : Author
  • PersonId : 914210
Olivier Groussin
  • Function : Author
  • PersonId : 837612
Pedro J. Gutiérrez
  • Function : Author
  • PersonId : 880386
Wing-Huen Ip
Laurent Jorda
Michael Küppers

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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hal-01439987 , version 1 (04-12-2020)

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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, 2015, 583, A45 (12 p.). ⟨10.1051/0004-6361/201525994⟩. ⟨hal-01439987⟩
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