aat Acta Astrophys. Tau. Acta Astrophysica Taurica 2712-925X Kiselev Nikolai Nikolaevich, Mosсow, settlement Moskovskii, Tat'yanin Park Str., 12, Moscow, Russia. RU 10 10.31059/aat.vol1.iss1.pp39-42 Research articles UBVRI photometric system of the meniscus telescope MTM-500 Rublevskii Aleksei Kiselev Nikolai Crimean Astrophysical Observatory, Nauchny 298409, Crimea Crimean Astrophysical Observatory, Nauchny 298409, Crimea 13 04 2020 1 1 39 42 10 04 2020 Copyright (c) Rublevskii A., Kiselev N. Rublevskii A., Kiselev N. The metadata for this submission is licensed under a Creative Commons Attribution 4.0 International License. Copyright and publishing rights for texts published in Acta Astrophysica Taurica is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

We present the method and results of defining coefficients while passing on from the instrument brightness values in u, b, v, r, i bands to U, B, V, R, I bands of the Johnson - Cousins system at the telescope MTM-500.

photometric system extinction coefficients Maksutov D.D., 1944. New catadioptric meniscus systems, Gosudarstvennoe izdatel'stvo oboronnoi promyshlennosti. (In Russ.) Khardi R., 1967. Astronomy methods, Moscow: Mir. (In Russ.) Kinoshita D., Ohtsuka K., Sekiguchi T., et al., 2007. Astron. Astrophys., vol. 466, no. 3, pp. 1153-1158. Zhang H-H., Liu, Xiao-Wei, et al., 2013. Res. Astron. Astrophys., vol. 13, no. 4, pp. 490-500.