The photometric part of the space project “Struve”

For the photometric programs of the astrometric and photometric space project STRUVE, the Vilnius seven-color system was chosen in its version, set up by the interference filters.The limiting magnitudes (or the dynamic range) and the final errors of the photometry are calculated for the Vilnius passbands (and the integral passband C) taking into account the optics of the telescopes (D = 40 cm, F = 250 cm and 2w = 1.6°), the filter parameters, the quantum efficiency of a CCD chips and the total mission time (3 years).Each of the two photometers consists of 28 CCD chips covered (or not covered) by different filters, and the relative area covered by a filter depends on its efficiency (maximum transmittance, halfwidth, quantum efficiency of CCD, etc.).The borders of the predicted dynamic range are V^in = (11.0± 0.5) mag and V^ax = (18.0± 0.5) mag with the final errors of the order of 1 mmag and 30 mmag respectively, depending on star colors.

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