Ground-based high resolution observations of the Uranian system in the near IR.

Details Ground-based high resolution observations of the Uranian system in the near IR. Ground-based high resolution observations of the Uranian system in the near IR.

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.0303m&link_type=abstract

American Astronomical Society, DPS meeting #31, #03.03

Physics

Optics

Scientific paper

The system of Uranus has been observed in May 1999 by means of the adonis/SHARPII+ Adaptive Optics system implemented on the 3.6 m telescope of La Silla-ESO (Chile). The use of the Shack-Hartmann wavefront sensor on the planet itself and the excellent seeing conditions have permitted to reach an angular resolution of ~ 0.14'' in the H broad band (1.6mu m). The sharpness of the images has been subsequently restored using a new myopic deconvolution method (MAP) including a specific edge preserving object prior. The images have revealed the presence of a latitudinal structure of the atmospheric clouds on the planetary disk (J and H bands), the presence of the Epsilon ring and its longitudinal anomaly.The most internal rings (Delta, Gamma, Eta) are also visible after deconvolution. Three of the known satellites has been detected: Ariel, Miranda and Puck (discovered by Voyager in 1989). We detect a significant shift of Puck's position with respect to the expected position, derived from the NASA/JPL Ephemeris Generator. We also present photometry of the 3 satellites and of the ring Epsilon using the J, H, K filters.

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