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Proceedings Paper

Gaia: focus, straylight and basic angle
Author(s): A. Mora; M. Biermann; A. Bombrun; J. Boyadjian; F. Chassat; P. Corberand; M. Davidson; D. Doyle; D. Escolar; W. L. M. Gielesen; T. Guilpain; J. Hernandez; V. Kirschner; S. A. Klioner; C. Koeck; B. Laine; L. Lindegren; E. Serpell; P. Tatry; P. Thoral
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Paper Abstract

The Gaia all-sky astrometric survey is challenged by several issues affecting the spacecraft stability. Amongst them, we find the focus evolution, straylight and basic angle variations Contrary to pre-launch expectations, the image quality is continuously evolving, during commissioning and the nominal mission. Payload decontaminations and wavefront sensor assisted refocuses have been carried out to recover optimum performance. An ESA-Airbus DS working group analysed the straylight and basic angle issues and worked on a detailed root cause analysis. In parallel, the Gaia scientists have also analysed the data, most notably comparing the BAM signal to global astrometric solutions, with remarkable agreement. In this contribution, a status review of these issues will be provided, with emphasis on the mitigation schemes and the lessons learned for future space missions where extreme stability is a key requirement.

Paper Details

Date Published: 1 August 2016
PDF: 17 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99042D (1 August 2016); doi: 10.1117/12.2230763
Show Author Affiliations
A. Mora, European Space Astronomy Ctr. (Spain)
Aurora Technology (Netherlands)
M. Biermann, Astronomisches Rechen-Institut (Germany)
A. Bombrun, European Space Astronomy Ctr. (Spain)
HE Space Operations GmbH (Germany)
J. Boyadjian, Airbus Defence and Space (France)
F. Chassat, Airbus Defence and Space (France)
P. Corberand, Airbus Defence and Space (France)
M. Davidson, Royal Observatory (United Kingdom)
D. Doyle, European Space Research and Technology Ctr. (Netherlands)
D. Escolar, European Space Research and Technology Ctr. (Netherlands)
W. L. M. Gielesen, TNO Science and Industry (Netherlands)
T. Guilpain, Airbus Defence and Space (France)
Altran Technologies (France)
J. Hernandez, European Space Astronomy Ctr. (Spain)
V. Kirschner, European Space Research and Technology Ctr. (Netherlands)
S. A. Klioner, Dresden Technical Univ. (Germany)
C. Koeck, Airbus Defence and Space (France)
B. Laine, European Space Research and Technology Ctr. (Netherlands)
L. Lindegren, Lund Observatory (Sweden)
E. Serpell, European Space Operations Ctr. (Germany)
Telespazio Vega Deutschland GmbH (Germany)
P. Tatry, Airbus Defence and Space (France)
P. Thoral, Airbus Defence and Space (France)

Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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