WSO-UV project guide star catalogue: experimental verification of its photometric system

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Catalogues, Stellar Data

Scientific paper

Precise pointing and stabilization of the T-170M telescope (World Space Observatory Ultraviolet, WSO-UV project) is provided by the Fine Guidance System (FGS) that uses a guide star catalogue (Master Catalogue). To verify the photometric system of the Master Catalogue we have carried out ground based observations with a CCD-camera in a spectral band, close to that of FGS. We have found, that the photometric quality of the Master Catalogue is sufficient for FGS operations. The mean photometric error in the range of 14-17 mag is ±0.23 mag; its variation over the sky does not exceed the factor of two. 2% of stars from the Master Catalogue have photometric errors higher than 2 mag. We have also found a correlation between large photometric errors and the Master Catalogue flags.

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