Albedo and color variegations on 67/P Churyumov-Gerasimenko as observed by OSIRIS/Rosetta

he ESA Rosetta spacecraft is in orbit around its target 67/P Churyumov-Gerasimenko since August 6th 2014. The OSIRIS camera system composed of the NAC (Narrow angle camera) and the WAC (Wide angle Camera) has the capability to image both the nucleus and the coma at different wavelengths from 0.245 microns up to 1 micron using filters. First images acquired from 100km distance have already revealed a very complex shape and potential areas with photometric variations. From August 2014 to the Philae landing event in November 2014, the nucleus surface will be mapped at multiple resolutions (1m up to 20 cm), helping in the landing site selection process. Such images will be obtained at very different incidence, emission and phase angles, allowing us to correct from topographical features the photometric properties of the surface. This presentation will focus on the albedo and colors variations, and on the spectral slopes derived from the OSIRIS filters. Of particular interest will be the identification of ices on the surface, and the mineralogical differences between different areas characterized by different topographic features.