Abstract The Hipparcos satellite generates about 1011 bytes of scientific data per year. The determination of astrometric and photometric quantities for the observed objects is a large and complicated task. The complexity is largely due to the strong coupling between objects in widely different parts of the sky, superposed by means of the two-way telescope, which makes it necessary to treat the whole set of data in a single reduction. The possibility to build a uniform and rigid reference frame across the whole sky depends entirely on this coupling. The reduction of the main data stream, concerned with 118,000 preselected stars, is made in parallel by two independent scientific consortia (FAST and NDAC), while the reduction of starmapper data for the Tycho project is done by a third consortium (TDAC). Frequent intercomparison of results at different levels of reduction will ensure that the consortia in the end can agree on a single output catalogue. The major steps of the main and Tycho reduction chains are described.


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    Title :

    Hipparcos data reduction overview


    Contributors:

    Published in:

    Publication date :

    1991-01-01


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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