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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    Title :

    Hipparcos calibration


    Contributors:

    Published in:

    Publication date :

    1991-01-01


    Size :

    8 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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