Affiliation: | 1. Department of Applied Mathematics, University of Agriculture in Kraków, ul. Balicka 253c, 30–198 Kraków, Poland;2. Astronomical Observatory of the Jagiellonian University ul. Orla 171, 30–244 Kraków, Poland;3. Astronomical Observatory of the Jagiellonian University ul. Orla 171, 30–244 Kraków, Poland |