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The Gaia Basic angle: measurement and variations

Published online by Cambridge University Press:  17 July 2015

A. Mora ,
U. Bastian ,
M. Biermann ,
F. Chassat ,
L. Lindegren ,
I. Serraller ,
E. Serpell  and
W. van Reeven
A. Mora
Affiliation:
ESA-ESAC Gaia SOC, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
U. Bastian
Affiliation:
Astronomisches Rechen-Institut, Heidelberg, Germany
M. Biermann
Affiliation:
Astronomisches Rechen-Institut, Heidelberg, Germany
F. Chassat
Affiliation:
Airbus Defence and Space, Toulouse, France
L. Lindegren
Affiliation:
Lund Observatory, Sweden
I. Serraller
Affiliation:
ESA-ESAC Gaia SOC, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
E. Serpell
Affiliation:
ESA-ESOC Gaia Operations, Darmstadt, Germany
W. van Reeven
Affiliation:
ESA-ESAC Gaia SOC, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
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Abstract

The ESA Gaia mission uses two telescopes to create the most ambitious survey of the Galaxy. The angle between them must be known with exquisite precision and accuracy. An interferometer: the Basic Angle Monitoring system measures its variations. High quality data have been retrieved and analysed for more than a year. A summary of the in-orbit performance and some early results are presented.

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References

GAIA Science Advisory Group 2000, “GAIA. Composition, Formation and Evolution of the Galaxy”, The GAIA Study Report (ESA-SCI(2000)4)
Gielesen, W., et al., 2012, “Gaia basic angle monitoring system,” Soc. Photo Opt. Instrum. Eng. (SPIE) Conf. Ser. 8442Google Scholar
Mora, A.et al., 2014, “Gaia on-board metrology: basic angle and best focus,” Soc. Photo Opt. Instrum. Eng. (SPIE) Conf. Ser. 9143Google Scholar
Prusti, T., 2015, “Gaia mission status,” in EAS Publications Series, this volume