Other
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.3605v&link_type=abstract
American Astronomical Society, DPS meeting #42, #36.05; Bulletin of the American Astronomical Society, Vol. 42, p.1065
Other
Scientific paper
We are using Cassini's Visual and Infrared Mapping Spectrometer (VIMS) to study Titan's sand. Specifically, we are constraining the sand's composition, the precise composition of which is still unknown. Water ice has been ruled out, leaving atmospherically-derived hydrocarbons as the best fit. We spectrally unmixed chosen pixels, each representing one unique composition, to determine the composition of Titan's equatorial sand seas. We selected our spectral endmembers using high resolution VIMS IR images (noodle maps), specifically from T20. We have 5 spectral endmembers, labeled by color from VIMS IR maps: dark brown, dark blue, Xanadu bright, equatorially bright, and 5-micron bright. The exact superposition of spectral endmembers of the sand's composition remains the subject of further study. We set up a linear model to test on mixed substrate pixels from the T20 flyby of Cassini over the northern Fensal sand dunes. Our model assumes some percent dark brown (sand) and some percent one other endmember. The product is a substrate map of Titan's dune fields, which we will compare with RADAR maps of the same area. Our results will determine if substrate type plays a role in dune morphology and location.
Barnes Jason W.
Radebaugh Jani
Vixie Graham D.
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