1. SPb Branch of Special Astrophysical Observatory of Russian Academy of Sciences , 65 Pulkovskoye Shosse, St. Petersburg 196140 , Russia
2. Astrophysical Department of Saint Petersburg State University , 7/9 Universitetskaya Nab., St. Petersburg 199034 , Russia
3. Innovation Management Department of Saint Petersburg Electrotechnical Univeristy , Ulitsa Professora Popova 5, 197376 St. Petersburg , Russia