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

Hambly, N. C., Cropper, M., Boudreault, S., Crowley, C., Kohley, R., de Bruijne, J. H. J., et al. (2018). Gaia Data Release 2: Calibration and mitigation of electronic offset effects in the data. Astronomy and Astrophysics, 616: A15. doi:10.1051/0004-6361/201832716.

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 Creators:
Hambly, N. C., Author
Cropper, M., Author
Boudreault, Steve1, Author              
Crowley, C., Author
Kohley, R., Author
de Bruijne, J. H. J., Author
Dolding, C., Author
Fabricius, C., Author
Seabroke, G., Author
Davidson, M., Author
Rowell, N., Author
Collins, R., Author
Cross, N., Author
Martín-Fleitas, J., Author
Baker, S., Author
Smith, M., Author
Sartoretti, P., Author
Marchal, O., Author
Katz, D., Author
De Angeli, F. , Author
Busso, G., AuthorRiello, M., AuthorAllende Prieto, C. , AuthorEls, S., AuthorCorcione, L., AuthorMasana, E., AuthorLuri, X., AuthorChassat, F., AuthorFusero, F., AuthorPasquier, J. F., AuthorVétel, C., AuthorSarri, G., AuthorGare, P., Author more..
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              

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Free keywords: instrumentation: detectors / methods: data analysis / space vehicles: instruments
 Abstract: 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 (<1 ms) timescales, identifying various systematic effects that are known collectively as “offset non-uniformities”. The effects manifest themselves as transient perturbations on the gross zero-point electronic offset level that is routinely monitored as part of the overall calibration process. Methods. Using in-orbit special calibration sequences along with simple parametric models, we show how the effects can be calibrated, and how these calibrations are applied to the science data. While the calibration part of the process is relatively straightforward, the application of the calibrations during science data processing requires a detailed on-ground reconstruction of the readout timing of each charge-coupled device (CCD) sample on each device in order to predict correctly the highly time-dependent nature of the corrections. Results. We demonstrate the effectiveness of our offset non-uniformity models in mitigating the effects in Gaia data. Conclusions. We demonstrate for all CCDs and operating instrument/modes on board Gaia that the video-chain noise-limited performance is recovered in the vast majority of science samples.

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Language(s): eng - English
 Dates: 2018-08-292018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/201832716
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Berlin : Springer-Verlag
Pages: - Volume / Issue: 616 Sequence Number: A15 Start / End Page: - Identifier: ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1