25 September 2012 Astrometric instrument modeling in the context of Gaia astrometric verification: tasks and activities
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Detailed knowledge of instrument parameters and observing conditions is crucial for the achievement of micro- arcsecond precision and accuracy. It has come to be a key ingredient for optimal definition of data reduction and calibration procedures, since the variation of instrumental response over the field of view with wavelength and in time is both critical and often unavoidable. With this work we provide an overview of Astrometric Instrument Model (AIM) system within the Astrometric Verification Unit for the reduction of the Gaia data. We recall on the original motivations for its development, the changes occurred during the last two years and the actual AIM structure, pointing out the most critical parts in relation to the modeling of the astrometric instrument and of the scientific treatment of the Gaia data. While waiting for the Gaia operations to start, we present first results of AIM system from the on-going testing campaign of the Gaia data reduction software systems.
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Deborah Busonero, Deborah Busonero, } "Astrometric instrument modeling in the context of Gaia astrometric verification: tasks and activities", Proc. SPIE 8449, Modeling, Systems Engineering, and Project Management for Astronomy V, 84490F (25 September 2012); doi: 10.1117/12.926703; https://doi.org/10.1117/12.926703

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