Journal Article

Sodium beacon tip—tilt determination with Rayleigh-aided auxiliary telescope technique

S. Esposito, A. Riccardi and R. Ragazzoni

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 294, issue 3, pages 489-493
Published in print March 1998 | ISSN: 0035-8711
Published online March 1998 | e-ISSN: 1365-2966 | DOI:
Sodium beacon tip—tilt determination with Rayleigh-aided auxiliary telescope technique

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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.

Keywords: atmospheric effects; methods: miscellaneous; techniques: miscellaneous; telescopes

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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