Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.294..489e&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 294, Issue 3, pp. 489-493.
Astronomy and Astrophysics
Astronomy
2
Atmospheric Effects, Methods: Miscellaneous, Techniques: Miscellaneous, Telescopes
Scientific paper
The usefulness of tracking the Rayleigh portion of a mesospheric sodium laser guide star as reference for absolute tip-tilt recovery in the frame of the auxiliary telescopes technique is shown. This approach leads to the reduction of the ground occupation needed to attain a given sky coverage by more than one order of magnitude. Speed, tracking precision, and the number of auxiliary telescopes are also reduced, making this new approach a more attractive one. The use of a low-altitude Rayleigh spot reinforces the fundamental limitations affecting this and other techniques, thus degrading significantly the quality of the recovered tip-tilt. However, it is shown that, provided adequate care is taken in the collection and treatment of data, an interesting tilt signal can still be retrieved.
Esposito Salvatore
Ragazzoni Roberto
Riccardi Armando
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