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Gaia : Focus, straylight and basic angle

Mora, A. ; Biermann, M. ; Bombrun, A. ; Boyadjian, J. ; Chassat, F. ; Corberand, P. ; Davidson, M. ; Doyle III, F ; Escolar, D. and Gielesen, W. L. M. , et al. (2016) Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave 9904.
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... (More)

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.

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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Astrometry, Basic angle, Focus, Gaia, Interferometry, Stability, Straylight, Wavefront sensor
host publication
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
volume
9904
article number
99042D
publisher
SPIE
conference name
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
conference location
Edinburgh, United Kingdom
conference dates
2016-06-26 - 2016-07-01
external identifiers
  • wos:000385794100068
  • scopus:84991387571
ISBN
9781510601871
DOI
10.1117/12.2230763
language
English
LU publication?
yes
id
c0f25524-83ad-4394-bc57-517f86632a0e
date added to LUP
2017-02-21 12:48:19
date last changed
2025-01-07 07:50:37
@inproceedings{c0f25524-83ad-4394-bc57-517f86632a0e,
  abstract     = {{<p>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.</p>}},
  author       = {{Mora, A. and Biermann, M. and Bombrun, A. and Boyadjian, J. and Chassat, F. and Corberand, P. and Davidson, M. and Doyle III, F and Escolar, D. and Gielesen, W. L. M. and Guilpain, T. and Hernandez, J and Kirschner, V. and Klioner, S. A. and Koeck, C. and Laine, B. and Lindegren, L. and Serpell, E. and Tatry, P. and Thoral, P.}},
  booktitle    = {{Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave}},
  isbn         = {{9781510601871}},
  keywords     = {{Astrometry; Basic angle; Focus; Gaia; Interferometry; Stability; Straylight; Wavefront sensor}},
  language     = {{eng}},
  publisher    = {{SPIE}},
  title        = {{Gaia : Focus, straylight and basic angle}},
  url          = {{http://dx.doi.org/10.1117/12.2230763}},
  doi          = {{10.1117/12.2230763}},
  volume       = {{9904}},
  year         = {{2016}},
}