NOTE: Titan's Atmosphere in Late Southern Spring Observed with Adaptive   Optics on the W.M. Keck II 10-meter Telescope
  Using adaptive optics on the W.M. Keck II telescope we imaged Titan several times during 1999 to 2001 in narrowband near-infrared filters selected to probe Titan's stratosphere and upper troposphere. We observed a bright feature around the south pole, possibly a collar of haze or clouds. Further, we find that solar phase angle explains most of the observed east-west brightness asymmetry of Titan's atmosphere, although the data do not preclude the presence of a `morning fog' effect at small solar phase angle. 
Henry G. Roe (UCB), Imke de Pater (UCB), Bruce A. Macintosh   (IGPP/LLNL), Seran G. Gibbard (IGPP/LLNL), Claire E. Max (IGPP...