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gaia early data release 3 documentation

3.4 Processing steps

3.4.11 Astrometric Image Parameters determination

Author(s): Michael Davidson

In IDU a dedicated task creates AstroElementary records for each CCD row and time interval following the model described in Section 3.3.6. These records contain the core image parameters required for the astrometric and photometric solutions, i.e. the observation time and G-band flux of the source in each window plus the across-scan position for 2D windows, along with their corresponding formal uncertainties. Information on the quality of the solution (degrees-of-freedom and goodness-of-fit) is included with extensive flags to report processing issues.