Journal
ASTRONOMY & ASTROPHYSICS
Volume 583, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201525994
Keywords
comets: individual: 67P/Churyumov-Gerasimenko; methods: data analysis; techniques: imaging spectroscopy
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Funding
- national funding agency of Germany (DLR)
- national funding agency of France (CNES)
- national funding agency of Italy (ASI)
- national funding agency of Spain (MEC)
- national funding agency of Sweden (SNSB)
- ESA Technical Directorate
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Context. We interpret multicolor data from OSIRIS NAC for the remote-sensing exploration of comet 67P/Churyumov-Gerasimenko. Aims. We determine the most meaningful definition of color maps for the characterization of surface variegation with filters available on OSIRIS NAC. Methods. 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. Results. 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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