Other
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p21e..03c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P21E-03
Other
[6008] Planetary Sciences: Comets And Small Bodies / Composition, [6017] Planetary Sciences: Comets And Small Bodies / Erosion And Weathering, [6055] Planetary Sciences: Comets And Small Bodies / Surfaces
Scientific paper
The Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) aboard Rosetta has successfully returned spatially-resolved 0.4-5.1 μm hyperspectral data as well as high spectral resolution 2-5 μm data of the main belt asteroid 21 Lutetia during the July 2010 fly-by. At the time of the data analysis for our first paper on the Lutetia's results (Coradini et al., Science in press) we were not able to perform any photometric correction due to the limited accuracy of the spacecraft orbit and attitude reconstruction from flight data. This implied that, for instance, we could not account for any subtle color variegation on the surface of the asteroid. On the contrary the Osiris team reported (Sierks et al, Science in Press) a reflectivity variation of up to 30%, in some spectral bands, inside craters located in the Baetica region. Using corrected S/C trajectory and attitude kernels derived from the combination of Virtis and Miro data, we are now in the position to verify Osiris findings and to extend them to a more thorough spectral coverage, removing the effect of variation in illumination conditions due to the real shape of the asteroid and to the local topography. The Hapke's light scattering theory can be applied to the spectral reflectance in the range were the radiance is not affected by the thermal emission contribution from the surface (the analysis of the thermal region is part of a separate work, Keihm et al, EPSC-DPS2011-39, 201, and shall not be treated here). The phase angle coverage is suitable to this task as it covers from 0° up to 140°, thus providing good constraints on the true reflectance (single scattering albedo) of the materials making up the surface as well as on the other parameters related to the scattering properties of the regolith. This analysis permits to determine the presence and surface coverage of any weathering products, at least in the region observed by Virtis which extend to from North pole to the equatorial regions. The analysis allows to verify preliminary evaluation of the Lutetia data which gave a clear phase reddening of the IR spectrum in the range 1.2-2.3 μm with a slope of 1.3x10-3 /deg. It allows also to put Lutetia in the context of the previous asteroid in-situ observations (951 Gaspra, 243 Ida, 433 Eros) for which color variation as well as albedo variations were observed and quantified across the surface.
Ammannito Eleonora
Arnold Gabriele
Barucci Andrea
Capaccioni Fabrizio
Capria Maria Teresa
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