1. Department of Astronomy, Kyoto University , Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
2. Astronomical Institute of the Slovak Academy of Sciences , 05960 Tatranská Lomnica, The Slovak Republic
3. Variable Star Observers League in Japan (VSOLJ) , 1001-105 Nishiterakata, Hachioji, Tokyo 192-0153, Japan
4. Osaka Kyoiku University , 4-698-1 Asahigaoka, Kashiwara, Osaka 582-8582, Japan
5. Physics Department, Rochester Institute of Technology , Rochester, NY 14623, USA
6. Institute of Astrophysics, National Academy of Sciences of Tajikistan , Dushanbe 734042, Republic of Tajikistan
7. Polaris Observatory, Hungarian Astronomical Association , Laborc utca 2/c, 1037 Budapest, Hungary
8. Variable Star Observers League in Japan (VSOLJ) , 7-1 Kitahatsutomi, Kamagaya, Chiba 273-0126, Japan
9. Observatorio de Cantabria, Ctra. de Rocamundo s/n , Valderredible, E-39220 Cantabria, Spain
10. Instituto de Fisica de Cantabria (CSIC-UC) , Avda. Los Castros s/n, E-39005 Santander, Spain
11. Agrupacion Astronomica Cantabra , Apartado 573, E-39080 Santander, Spain
12. Vihorlat Observatory , Mierova 4, 06601 Humenne, Slovakia
13. Federal State Budget Scientific Institution “Crimean Astrophysical Observatory” , Nauchny 298409, Republic of Crimea
14. Main Astronomical Observatory of the National Academy of Sciences of Ukraine , 27 Akademika Zabolotnoho St, UA-03143 Kyiv, Ukraine
15. Center for Backyard Astrophysics Belgium , Walhostraat 1a, B-3401 Landen, Belgium
16. Center for Backyard Astrophysics Extremadura , e-EyE Astronomical Complex, E-06340 Fregenal de la Sierra, Spain
17. Flarestar Observatory , San Gwann SGN 3160, Malta
18. M. R. Stefanik Observatory and Planetarium , Sladkovicova 41, 92001 Hlohovec, Slovakia
19. Institute of Earth Systems, University of Malta , Msida MSD 2080, Malta
20. Groupe Européen d’Observations Stellaires (GEOS) , 23 Parc de Levesville, F-28300 Bailleau l’Evêque, France
21. Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne (BAV) , Munsterdamm 90, D-12169 Berlin, Germany
22. Vereniging Voor Sterrenkunde (VVS) , Oostmeers 122 C, B-8000 Brugge, Belgium
23. Variable Star Observers League in Japan (VSOLJ) , Kaminishiyama-machi 12-2, Nagasaki, Nagasaki 850-0006, Japan