Physics – Optics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iauss...1e...9b&link_type=abstract
Astronomical Facilities of the Next Decade, 26th meeting of the IAU, Special Session 1, 16-17 August, 2006 in Prague, Czech Repu
Physics
Optics
Scientific paper
Gaia is the only ESA space mission of the next decade devoted to very high-accuracy astrometric observations. Due for launch in 2011, Gaia will perform global astrometric measurements with an accuracy ranging from a few micro-arcseconds to few tens of micro-arcseconds for stars of V=15. The mission aims at an unprecedented improvements of our current understanding of the Galaxy through an all-sky continuous five-year acquisition of astrometric, photometric, and spectroscopic measurements. To achieve its challenging performance, a highly detailed analysis is essential to identify, understand, and calibrate correctly the instrument behaviour and those disturbing effects introduced on the signal of a point-like source. This can be achieved through comprehensive testing and development of a realistic and detailed instrument model. Here we address specific topics critical for a micro-arcseconds level calibration of the Gaia satellite. We identify perturbing effects on the signal due to optics, attitude, CCD behaviour, modes of operations, and evaluate the errors on the astrometric parameters for single transits. We also discuss of the implementation of diagnostic and correction procedures based on the scientific data. In this context, we provide examples, like optical aberrations and CCD sensor level properties (e.g., CTI), which can introduce systematic biases as large as two order of magnitudes the requirements. We show that is possible to define modelling and analysis tools at the challenging level of the mission objective.
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