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Proceedings Paper

Testing FORS: the first focal reducer for the ESO VLT
Author(s): Thomas Szeifert; Immo Appenzeller; Walter Fuertig; Walter Seifert; Otmar Stahl; Hermann Boehnhardt; W. Gaebler; Reinhold Haefner; Hans-Joachim Hess; Karl-Heinz Mantel; Wolfgang Meisl; Bernard Muschielok; Karl Tarantik; Reiner Harke; Peter Juergens; Harald E. Nicklas; Gero Rupprecht
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Paper Abstract

FORS1 (FOcal Reducer/low-dispersion Spectrograph) is an all dioptric focal reducer designed for direct imaging, low- dispersion multi-object spectroscopy, imaging polarimetry and spectro-polarimetry of faint objects. Two identical copies of the instrument (FORS 1 and 2) are being built by a consortium of three astronomical institutes (Landessternwarte Heidelberg and the University Observatories of Gottingen and Munich) under contract and in cooperation with ESO. FORS 1 and 2 will be installed, respectively, in 1998 and 2000 at the Cassegrain foci of the ESO VLT unit telescopes nos. 1 and 2. For the tests of FORS in Europe, a telescope and star simulator was built, which allows to incline and rotate the whole instrument and to simulate stars in the field of view at various seeing conditions. FORS 1 was integrated at the telescope simulator and saw its 'first light' in the integration facility in November 1996. Since then the electro-mechanical functions, the image motion due to flexure, the calibration units, the optical performance and the instrument software were tested and optimized. This paper presents a summary of the procedure and the results of the tests.

Paper Details

Date Published: 9 July 1998
PDF: 8 pages
Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); doi: 10.1117/12.316782
Show Author Affiliations
Thomas Szeifert, Landessternwarte Heidelberg (Chile)
Immo Appenzeller, Landessternwarte Heidelberg (Germany)
Walter Fuertig, Landessternwarte Heidelberg (Germany)
Walter Seifert, Landessternwarte Heidelberg (Germany)
Otmar Stahl, Landessternwarte Heidelberg (Germany)
Hermann Boehnhardt, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen and European Southern Observatory (Chile)
W. Gaebler, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen (Germany)
Reinhold Haefner, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen (Germany)
Hans-Joachim Hess, Univ.-Sternwarte Muenchen (Germany)
Karl-Heinz Mantel, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen (Germany)
Wolfgang Meisl, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen (Germany)
Bernard Muschielok, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen (Germany)
Karl Tarantik, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen (Germany)
Reiner Harke, Univ.-Sternwarte/Georg-August-Univ. Goettingen (Germany)
Peter Juergens, Univ.-Sternwarte/Georg-August-Univ. Goettingen (Germany)
Harald E. Nicklas, Univ.-Sternwarte/Georg-August-Univ. Goettingen (Germany)
Gero Rupprecht, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 3355:
Optical Astronomical Instrumentation
Sandro D'Odorico, Editor(s)

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