2016
DOI: 10.1117/12.2230763
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Gaia: focus, straylight and basic angle

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 wo… Show more

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Cited by 16 publications
(11 citation statements)
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“…It can also jeopardize the detection of faint objects such as exoplanets in the case of coronagraphs. The worst situation is if a SL issue is only discovered once the instrument is already in space, as it was the case for example in the GAIA mission 4 .…”
mentioning
confidence: 99%
“…It can also jeopardize the detection of faint objects such as exoplanets in the case of coronagraphs. The worst situation is if a SL issue is only discovered once the instrument is already in space, as it was the case for example in the GAIA mission 4 .…”
mentioning
confidence: 99%
“…The Hipparcos catalog (ESA, 1997) is shown as a solid orange line for comparison, the integrated sky appearing slightly brighter until the catalog completeness falls off above m V ∼ 9. Newer catalogs such as Gaia (Mora et al, 2016) would provide increased precision but not discernibly alter the shape of the stellar density function for these relatively bright stars. Neglecting detector effects, integration over the distribution of stellar magnitudes (m), and the instrument field-of-view (FOV) give the total number of photons per second received by the detector from stars up to a limiting magnitude m l .…”
Section: Sensingmentioning
confidence: 99%
“…The Hipparcos catalog ESA ( 1997) is shown as a solid orange line for comparison, the integrated sky appearing slightly brighter until the catalog completeness falls off above m V ∼ 9. Newer catalogs such as Gaia (Mora et al, 2016) would provide increased precision but not discernibly alter the shape of the stellar density function for these relative bright stars. Neglecting detector effects, integration over the distribution of stellar magnitudes (m) and the instrument field-of-view (FOV) gives the total number of photons per second received by the detector from stars up to a limiting magnitude m l .…”
Section: Sensingmentioning
confidence: 99%