1. Bouchez et al., 2005 Refraction in a spherical atmosphere Deflection angle Flux from Elliot and Young, 1992. Spherical atmosphere, T=177 K

2. Bouchez et al., 2005 Refraction in an elliptical atmosphere

3. Bouchez et al., 2005 Occultation imaging sequence ( 20 frames sec -1 ) Palomar 241-actuator adaptive optics system on the 5-m Hale telescope. PHARO 1024x1024 near-IR camera, K’ filter (1.95 – 2.30 μm). 437ms integrations every 880 ms, total 4700 images.

4. Bouchez et al., 2005 Titan-subtracted images ( 10 frames sec -1 ) 2 refracted images visible throughout each occultation. No central flash. Unocculted star provides photometric and astrometric reference.

5. Bouchez et al., 2005 Best fit isobaric surface implies a polar jet Best-fit 8th order isobaric surface fit to positions of both stars. Implies strong winter jet, weaker zonal circulation in summer hemisphere. Consistent with GCM models (Hourdin et al. 1995, Rannou et al. 2002), though wind speeds are ~40% higher Huygens drogue chute should be OK!