Physics – Optics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt.........3m&link_type=abstract
PhD Theses
Physics
Optics
Astronomical Telescopes, High Resolution Imaging, Planetary Science, Adaptive Optics, Data Processing, Deconvolution, Volcanism, Comet, Bifurcated Asteroid, Astrometry Of Satellites
Scientific paper
Since the development of the spatial mission, the observations of the planetary objects from the ground were despised. The Adaptive Optics technic providing images with a spatial resolution closed to the limit of diffraction of the telescope is a new tool for planetary science. In this thesis, I present first my contribution to the support and calibration of the ADONIS AO system mounted at the 3.6m telescope of ESO-La Silla. The sharpness of the images obtained by such systems can be improved applying a deconvolution process. Our test and simulation performed showed that two new methods are adapted for planetary images: MISTRAL et idac. Applying this algorithm on thermal band (3.8 μm images of Io, we detected the most actif hot spots on both hemisphere of the satellite. The resolution resolution (~ 570~km) is comparable to the one obtained with Galileo probe and we observed the same features than the first data taken with the spectroimager NIMS. Our monitoring on the volcanic activity on the year 1998 and 1999 indicates an obvious difference between the two well-know hot spot of Io (Loki and Pele), but also the presence of new sources which were not seen since then. Using the same techniques, we studied other bodies of the solar system. We detected a secondary feature in the inner coma of the C/1995 O1 Hale-Bopp comet and revealed the bifurcated shape of the asteroid 216 Kleopatra. From several run of observations of the Uranian system, we recalculated the orbit of the inner satellite Puck for which the eccentricity is much higher than the one calculated from the Voyager and Hubble Space Telescope data.
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