Global-scale surface spectral variations on Titan seen from Cassini/VIMS
Sotin, Christophe; Barnes, Jason W.; Rodriguez, Sebastien; Baines, Kevin H.; Buratti, Bonnie J.; Brown, Robert H.; Soderblom, Laurence; Clark, Roger; Nicholson, Phil; Le Mouèlic, Stephane
United States, France
Abstract
We present global-scale maps of Titan from the Visual and Infrared Mapping Spectrometer (VIMS) instrument on Cassini. We map at 64 near-infrared wavelengths simultaneously, covering the atmospheric windows at 0.94, 1.08, 1.28, 1.6, 2.0, 2.8, and 5 μm with a typical resolution of 50 km/pixel or a typical total integration time of 1 s. Our maps have five to ten times the resolution of ground-based maps, better spectral resolution across most windows, coverage in multiple atmospheric windows, and represent the first spatially resolved maps of Titan at 5 μm. The VIMS maps provide context and surface spectral information in support of other Cassini instruments. We note a strong latitudinal dependence in the spectral character of Titan's surface, and partition the surface into 9 spectral units that we describe in terms of spectral and spatial characteristics.