Gaia Data Release 2: Calibration and mitigation of electronic offset effects in the data

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...

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Published in:Astronomy and astrophysics (Berlin) 2018-08
Main Authors: Hambly, Nigel C, Cropper, Mark, Boudreault, Steve, Crowley, Cian, Kohley, Ralf, Bruijne, Jos de, Dolding, Chris, Fabricius, Claus, Seabroke, George, Davidson, Michael, Rowell, Nicholas, Collins, Ross, Cross, Nicholas, Martín Fleitas, Juan Manuel, Baker, Steven, Smith, Mike, Sartoretti, Paola, Marchal, Olivier, Katz, David, Angeli, Francesca de, Busso, Giorgia, Riello, Marco, Allende Prieto, Carlos, Els, Sebastian, Corcione, Leonardo, Masana Fresno, Eduard, Luri Carrascoso, Xavier, Chassat, François, Fusero, Florence, Pasquier, Jean François, Vétel, Cyril, Sarri, Giuseppe, Gare, Philippe
Format: Article
Language:English
Subjects:
Astrometria
Astrometry
Catàlegs d'estels
Data processing
Detectors
Processament de dades
Star catalogs
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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