The surface of Titan as seen by the VIMS imaging spectrometer onboard CASSINI

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Scientific paper

The Visual and Infrared Mapping Spectrometer (VIMS) instrument onboard CASSINI acquires images simultaneously in 352 wavelengths from the visible (0.3 μm) to the infrared (5.1 μm). The observations acquired during the first flyby in October 2004 have demonstrated the capacity of VIMS to observe the surface directly through the atmosphere in seven infrared windows between the methane absorption bands. Since October 2004, 5 close flybys have provided surface images with a spatial resolution up to ~1-2 km per pixel, which reveal the diversity of the surface features. In particular, a circular feature observed at high resolution during the October 26 flyby may correspond to a cryo-volcano where the methane, destabilized in the subsurface, would be released at the surface. VIMS high resolution images provide an information about the composition of the exposed surface, and are very complementary of the information provided by other instruments such as the radar or the ISS camera.

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