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• W3106069874 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." @default.
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• W3106069874 date "2016-08-01" @default.
• W3106069874 modified "2023-09-26" @default.
• W3106069874 title "Gaia: focus, straylight and basic angle" @default.
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• W3106069874 doi "https://doi.org/10.1117/12.2230763" @default.
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