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On-sky verification of the 6-h periodic basic angle variations of the Gaia satellite

Published online by Cambridge University Press:  07 March 2018

Shilong Liao ,
Mario G. Lattanzi ,
Alberto Vecchiato ,
Zhaoxiang Qi ,
Mariateresa Crosta  and
Zhenghong Tang
Shilong Liao*
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, 200030 Shanghai, China INAF-Osservatorio Astrofisico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, TO, Italy
Mario G. Lattanzi
Affiliation:
INAF-Osservatorio Astrofisico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, TO, Italy
Alberto Vecchiato
Affiliation:
INAF-Osservatorio Astrofisico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, TO, Italy
Zhaoxiang Qi
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, 200030 Shanghai, China
Mariateresa Crosta
Affiliation:
INAF-Osservatorio Astrofisico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese, TO, Italy
Zhenghong Tang
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, 200030 Shanghai, China
*
*email: [email protected]
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Abstract

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A Basic Angle (BA) of 106.5° separates the view directions of Gaia's two fields of view (FoV). A precise determination of the BA variations (BAV) is essential to guarantee a correct reconstruction of the global astrometric sphere, as residual systematic errors would result in, e.g., a bias in the parallaxes of the final Gaia catalog. The Basic Angle Monitoring (BAM) device, which provides a reliable and accurate estimation of BAV, shows that there exists a ~1 mas amplitude, 6-h period BA oscillation. It's essential to verify to what extent this signal is caused by real BAV, or is at least in part an effect of the BAM device itself. Here, we propose an astrometric on-sky approach to re-determine the 6-h periodic BAV. The results of this experiment, which treated a full day (17 Oct 2016) of Gaia astrometric data, recover a value for the 6-h oscillation of 1.856±0.857 mas. This is consistent, within the errors, with the BAM finding for that day.

Keywords

periodic basic angle variationastrometric methodvalidation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 231 - 232
Copyright
Copyright © International Astronomical Union 2018 

References

Gaia collaboration, Prusti, T., et al., 2016, A&A, A1, 595 Google Scholar
Mora, A., Biermann, M., et al. 2014, SPIE, 91430XGoogle Scholar