Abstract The methods and results of various Hipparcos in-flight calibrations are described. The geometrical calibrations allow the determination of the instrument distortions in the main field of view to better than a milli-arcsecond. A systematic decrease of the basic angle at a rate of two milli-arcseconds per month has been measured during the first 7 months of operation. Results of the photometric calibration of the main instrument show a decrease in sensitivity of about 1.5% per month. No significant decrease has been found for the star-mapper sensitivity.


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    Titel :

    Hipparcos calibration


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    01.01.1991


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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