Characterization of OSIRIS NAC filters for the interpretation of multispectral data of comet 67P/Churyumov-Gerasimenko
2015 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 583, A45Article in journal (Refereed) PublishedText
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.
Place, publisher, year, edition, pages
2015. Vol. 583, A45
comets: individual: 67P/Churyumov-Gerasimenko, methods: data analysis, techniques: imaging spectroscopy
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-270613DOI: 10.1051/0004-6361/201525994ISI: 000365072200045OAI: oai:DiVA.org:uu-270613DiVA: diva2:890241