9 August 2016 OAJ 2.6m survey telescope: optical alignment and on-sky evaluation of IQ performances
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Abstract
AMOS has recently completed the alignment campaign of the 2.6m telescope for the Observatorio Astrofisico de Javalambre (OAJ). AMOS developed an innovative alignment technique for wide field-of-view telescopes that has been successfully implemented on the OAJ 2.6m telescope with the active support of the team of CEFCA (Centro de Estudios de Física del Cosmos de Aragón). The alignment relies on two fundamental techniques: (1) the wavefront-curvature sensing (WCS) for the evaluation of the telescope aberrations at arbitrary locations in the focal plane, and (2) the comafree point method for the adjustment of the position of the secondary mirror (M2) and of the focal plane (FP). The alignment campaign unfolds in three steps: (a) analysis of the repeatability of the WCS measurements, (b) assessment of the sensitivity of telescope wavefront error to M2 and FP position adjustments, and (c) optical alignment of the telescope. At the end of the campaign, seeing-limited performances are demonstrated in the complete focal plane. With the help of CEFCA team, the image quality of the telescope are investigated with a lucky-imaging method. Image sizes of less than 0.3 arcsec FWHM are obtained, and this excellent image quality is observed over the complete focal plane.
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Gregory P. Lousberg, Gregory P. Lousberg, Christian Bastin, Christian Bastin, Vincent Moreau, Vincent Moreau, Olivier Pirnay, Olivier Pirnay, Carlo Flebus, Carlo Flebus, Sergio Chueca, Sergio Chueca, César Iñiguez, César Iñiguez, Alessandro Ederoclite, Alessandro Ederoclite, Héctor Vázquez Ramió, Héctor Vázquez Ramió, A. Javier Cenarro, A. Javier Cenarro, } "OAJ 2.6m survey telescope: optical alignment and on-sky evaluation of IQ performances", Proc. SPIE 9911, Modeling, Systems Engineering, and Project Management for Astronomy VI, 991109 (9 August 2016); doi: 10.1117/12.2234267; https://doi.org/10.1117/12.2234267
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