Three looks at Gaia data volumes
2010
In this paper we discuss a few aspects of the data volume to be generated by the ESA
space astrometry mission Gaia. This volume is assessed first from the on-board point of
view in the form of the instantaneous number of sources in the combined astrometric fields
of view as a function of time. Then one focuses on the data flow for the data processing
itself measured by the number of objects entering the pipeline every day. Finally the
combination of the on-board acquisition scheme with the number of stars per day gives the
actual telemetry volume to be transferred to the ground and its variation during the
mission.
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