Gaia in-orbit realignment: overview and data analysis

Alcione Mora; Amir Vosteen

doi:10.1117/12.926313

21 September 2012 Gaia in-orbit realignment: overview and data analysis

Alcione Mora, Amir Vosteen

Proceedings Volume 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave; 84421Q (2012) https://doi.org/10.1117/12.926313
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The ESA Gaia spacecraft has two Shack-Hartmann wavefront sensors (WFS) on its focal plane. They are required to refocus the telescope in-orbit due to launch settings and gravity release. They require bright stars to provide good signal to noise patterns. The centroiding precision achievable poses a limit on the minimum stellar brightness required and, ultimately, on the observing time required to reconstruct the wavefront. Maximum likelihood algorithms have been developed at the Gaia SOC. They provide optimum performance according to the Crámer-Rao lower bound. Detailed wavefront reconstruction procedures, dealing with partial telescope pupil sampling and partial microlens illumination have also been developed. In this work, a brief overview of the WFS and an in depth description of the centroiding and wavefront reconstruction algorithms is provided.

Citation Download Citation

Alcione Mora and Amir Vosteen "Gaia in-orbit realignment: overview and data analysis", Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84421Q (21 September 2012); https://doi.org/10.1117/12.926313

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