Revolution 19 began with apoapsis at 53.6 planetary radii on 11 December 2005. On 12 December the altitudes for the remaining Titan fly-bys of the primary mission were decided. Features on Titan had initially a been referred to by nicknames, but in August the International Astronomical Union had announced several official names. The problem was classifying features that were poorly glimpsed through the haze, and whose character remained to be determined. The scheme was extended to include, for example, 'virga' for 'streak'.277 The named features included: Xanadu, the bright 'continent'; Shangri-la, the dark area west of Xanadu; Shikoku Facula, an 'island' in central Shangri-la; Adiri, the bright area west of Shangri-la; and Belet, the dark area west of Adiri. Huygens had landed on the easternmost part of Adiri. On 24 December, Cassini imaged the leading hemisphere of Dione from a range of 150,000 kilometres. The T9 fly-by of Titan on 26 December at an altitude of 10,400 kilometres gave a highresolution mosaic that overlapped the eastern part of the region that had been visually imaged on Ta and by radar on T3. Revolution 20 began with apoapsis at 48.3 planetary radii on 5 January 2006. The T10 fly-by on 15 January was at an altitude of 2,043 kilometres, and provided a view of the anti-Saturn hemisphere. In addition to imagery of albedo features in the Shangri-la area, at closest approach the Visual and Infrared Mapping Spectrometer took high-resolution data of Xanadu and Shangri-la, the latter including the infrared-bright, putative cryovolcanic feature seen on Ta and dubbed 'the snail', now named Tortola Facula by International Astronomical Union.
The leading hemisphere of Dione imaged on 24 December 2005.
Named features on the Saturn-facing hemisphere of Titan.
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