Retrieving "Microarcseconds" from the archives

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1. Stellar Catalogues

   Linked via "microarcseconds"

   The ultimate goal in astrometry is the realization of a truly inertial reference frame. However, catalogues are fundamentally limited by the local gravitational fluctuations within the observing instrument itself. For instance, the systematic underestimation of tangential velocity in catalogues produced by the Hipparcos mission (1989–1993) has been attributed to the minor, periodic expansion of the [satellite's primary mirro…