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Communication Dans Un Congrès Année : 2018

New Astronomical Reduction of Old Observations (the NAROO project)

Résumé

The Gaia astrometric reference catalogue will provide star proper motions with an accuracy of one mas one century ago for stars of magnitude 14 or brighter. Our project is to re-reduced the old observations with the new catalogue allowing to have an astrometric accuracy only limited by the observational biases and not by reference stars. Then, we plan to get an accuracy of 50 mas where the old reductions were not better than 500 mas! For our purpose, we will digitize old photographic plates with a sub-micrometric scanner. Tests were made using the UCAC catalogue showing that old photographic plates have an intrinsect accuracy of 30 to 60 mas.
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Dates et versions

hal-02323670 , version 1 (21-10-2019)

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Jean-Eudes Arlot, Vincent Robert, Valéry Lainey, Coralie Neiner, Nicolas Thouvenin. New Astronomical Reduction of Old Observations (the NAROO project). Astrometry and Astrophysics in the Gaia sky, Apr 2017, Nice, France. pp.83-84. ⟨hal-02323670⟩
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