  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.
