Title
Gaia: Focus, straylight and basic angle
Author
Mora, A.
Biermann, M.
Bombrun, A.
Boyadjian, J.
Chassat, F.
Corberand, P.
Davidson, M.
Doyle, D.
Escolar, D.
Gielesen, W.L.M.
Guilpain, T.
Hernandez, J.
Kirschner, V.
Klioner, S.A.
Koeck, C.
Laine, B.
Lindegren, L.
Serpell, E.
Tatry, P.
Thoral, P.
Contributor
MacEwen, H.A. (editor)
Lystrup, M. (editor)
Fazio, G.G. (editor)
Publication year
2016
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.
Subject
Nano Technology
SSE - Space Systems Engineering
TS - Technical Sciences
High Tech Systems & Materials
Electronics
Industrial Innovation
Astrometry
Basic angle
Focus
Gaia
Interferometry
Stability
Straylight
Wavefront sensor
Adaptive optics
Convergence of numerical methods
Focusing
Interferometry
Space flight
Space telescopes
Mitigation schemes
Optimum performance
Root cause analysis
Wave front sensors
Working groups
Millimeter waves
To reference this document use:
http://resolver.tudelft.nl/uuid:d938b9ee-06aa-4711-a396-dc1ec8d8f030
TNO identifier
573284
Publisher
SPIE
ISBN
9781510601871
ISSN
0277-786X
Source
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 26 June 2016 - 1 July 2016, 9904
Series
Proceedings of SPIE - The International Society for Optical Engineering
Article number
99042D
Document type
conference paper