36th DPS Meeting, 8-12 November 2004
Session 22 Titan II: Chemistry
Oral, Wednesday, November 10, 2004, 10:30-12:00noon, Lewis

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[22.08] Titan with adaptive optics : atmospheric changes and surface maps, 2000-2004

M. Hirtzig, A. Coustenis, E. Gendron, P. Drossart, M. Combes (LESIA, Obs. de Meudon, France), O. Lai (LESIA, Obs. de Meudon and CFHT, Hawaii), P. Rannou (S.A., CNRS, and Univ. de Versailles, France), A. Negrao (LESIA, Obs. de Meudon, and Univ. de Versailles, France), E. Emsellem, A. Pecontal-Rousset (CRAL, Obs. de Lyon, France), S. Lebonnois (LMD, Jussieu, Paris, France)

We present the evolution as a function of time of several features visible in Titan's images. We base our study on disk-resolved observations gathered from 2000 to 2004 at the CFHT (with PUEO/KIR or PUEO/OASIS) or at the VLT (NAOS/CONICA) in the near-infrared (Gendron et al., 2004, A& A, 217).We will present the evolution of Titan's North-South asymmetry, with a monitoring of its reversal, begininng at higher altitudes in Titan's atmosphere and diffusing to lower altitudes with time (Hirtzig et al., 2004, PSS, in press). Also, possible diurnal effects will be reviewed. The presence of a very bright feature near Titanís South Pole visible at very specific wavelengths, in particular at 2.12 micron, will be discussed (Hirtzig et al., 2004, submitted).

Maps produced from our 4-year imaging of Titan's surface will be shown (Coustenis et al., 2004, submitted).

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Bulletin of the American Astronomical Society, 36 #4
© 2004. The American Astronomical Soceity.