In this volume, the methods adopted for the reduction of the Hipparcos data are described in detail. The algorithms have been studied and selected with considerable care, not only so as to preserve fully the precision achievable by the primary measurement programme, but also so as to avoid discarding any items of useful information: with these objectives, for example, the astrometric and photometric measurements constituting the Tycho programme have been exploited, as have the measurements of double and multiple stars. Throughout the reductions, it will be necessary to identify and carefully calibrate possible variations in the geometric and photometric parameters of the instrument, and the reduction algorithms have been set up with these considerations in mind. The reductions have also been optimised through the decomposition of the data treatment into three principal steps - nevertheless the data treatment is extremely heavy computationally. The data treatment has been prepared and will be run by two groups working independently: FAST and NDAC. Some of the details of their methods differ, but the same general reduction scheme has been adopted by both, which means that comparisons of the intermediate data will be possible throughout the mission.


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    Titel :

    Hipparcos mission. Pre-launch status. Volume 3. The data reductions


    Weitere Titelangaben:

    Hipparcos-Mission. Status vor dem Start. Band 3. Datenreduktion


    Erschienen in:

    Erscheinungsdatum :

    1989


    Format / Umfang :

    515 Seiten


    Medientyp :

    Report


    Format :

    Print


    Sprache :

    Englisch