Gaia Data Release 2

Context. The European Space Agency’s Gaia satellite was launched into orbit around L2 in December 2013. This ambitious mission has strict requirements on residual systematic errors resulting from instrumental corrections in order to meet a design goal of sub-10 microarcsecond astrometry. During the...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2018-08, Vol.616
Main Authors: Hambly, N. C., Cropper, M., Boudreault, S., Crowley, C., Kohley, R., de Bruijne, J. H. J., Dolding, C., Fabricius, C., Seabroke, G., Davidson, M., Rowell, N., Collins, R., Cross, N., Martín-Fleitas, J., Baker, S., Smith, M., Sartoretti, P., Marchal, O., Katz, D., De Angeli, F., Busso, G., Riello, M., Allende Prieto, C., Els, S., Corcione, L., Masana, E., Luri, X., Chassat, F., Fusero, F., Pasquier, J. F., Vétel, C., Sarri, G., Gare, P.
Format: Article
Language:English
Subjects:
Analog to digital conversion
Astrometry
Calibration
Chains
Charge coupled devices
Data processing
Flight behavior
instrumentation: detectors
methods: data analysis
Offsets
Satellites
space vehicles: instruments
Systematic errors
Time dependence
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Summary:Context. The European Space Agency’s Gaia satellite was launched into orbit around L2 in December 2013. This ambitious mission has strict requirements on residual systematic errors resulting from instrumental corrections in order to meet a design goal of sub-10 microarcsecond astrometry. During the design and build phase of the science instruments, various critical calibrations were studied in detail to ensure that this goal could be met in orbit. In particular, it was determined that the video-chain offsets on the analogue side of the analogue-to-digital conversion electronics exhibited instabilities that could not be mitigated fully by modifications to the flight hardware. Aims. We provide a detailed description of the behaviour of the electronic offset levels on short (
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201832716