Year: 2014
Type: conference-paper
Abstract: The Gaia payload ensures maximum passive stability using a single material, SiC, for most of its elements. Dedicated metrology instruments are, however, required to carry out two functions: monitoring the basic angle and refocusing the telescope. Two interferometers fed by the same laser are used to measure the basic angle changes at the level of μas (prad, micropixel), which is the highest level ever achieved in space. Two Shack- Hartmann wavefront sensors, combined with an ad-hoc analysis of the scientific data are used to define and reach the overall best-focus. In this contribution, the systems, data analysis, procedures and performance achieved during commissioning are presented .
DOI: 10.1117/12.2054602
Authors: A. Mora, M. Biermann, A. G. A. Brown, D. Busonero, L. Carminati, J. M. Carrasco, F. Chassat, M. Erdmann, W. L. M. Gielesen, C. Jordi, D. Katz, R. Kohley, L. Lindegren, W. Loeffler, O. Marchal, P. Panuzzo, G. Seabroke, J. Sahlmann, E. Serpell, I. Serraller, F. van Leeuwen, W. van Reeven, T. C. van den Dool, L. L. A. Vosteen
Institutions: European Space Astronomy Centre, Leiden University, Leiden Observatory, Osservatorio Astrofisico di Torino, National Institute for Astrophysics, Airbus (France), Institut de Ciències del Cosmos, Universitat de Barcelona, European Space Research and Technology Centre, Netherlands Organisation for Applied Scientific Research
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2140297256