VIS-IR spectrograms of Saturn's rings retrieved from Cassini-VIMS radial mosaics

Details VIS-IR spectrograms of Saturn's rings retrieved from Cassini-VIMS radial mosaics VIS-IR spectrograms of Saturn's rings retrieved from Cassini-VIMS radial mosaics

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..293f&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.293

Computer Science

Scientific paper

Context: Cassini-VIMS has harvested a large number of Saturn's rings radial mosaics at very different observation geometries. Aims: This work is focused on the retrieval of rings average composition (water ice and red cromophores), regolith grain sizes and photometric parameters. Method: We have implemented a procedure to build ring spectrograms, e.g., 2D arrays that contain the full spectral (0.35 - 5.0 μm) and spatial (from 73.500 to 141.375 km) information sampled at 400 km/bin spatial resolution. This processing is applied to several mosaics acquired at different illumination phases (12° to 136°) and opening angles (-21° to +5°). Results: Ring spectra show reddening at VIS wavelengths while maintaining a strong similarity to water ice in the IR. Differences both in VIS reddening, water ice abundance and grain sizes are retrieved across different rings regions. Conclusions: Two important findings are that 1) both VIS reddening and water ice band depths increase at high phases, thus indicating that the red contaminant is intimately mixed in water ice grains; 2) typical regolith grain sizes are between 10-40 μm in the C ring, 40-60 μm in the Cassini Division (CD) and >100 μm in the A and B rings.

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