1. INAF, Osservatorio Astrofisico di Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy
2. EPT Observatories, Tijarafe, E-38780 La Palma, Spain
3. INAF, TNG Fundación Galileo Galilei, E-38712 La Palma, Spain
4. Instituto de Astronomía, Universidad Nacional Autónoma de México, Cd. Universitaria, CDMX, Mexico
5. Abastumani Observatory, Mt. Kanobili, 0301 Abastumani, Georgia
6. Samtskhe-Javakheti State University, 92 Shota Rustaveli St. Akhaltsikhe, Georgia
7. Landessternwarte, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, D-69117 Heidelberg, Germany
8. Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital-263 001, India
9. Ulugh Beg Astronomical Institute, Maidanak Observatory, Tashkent 100052, Uzbekistan
10. INAF, Istituto di Radioastronomia, Via Gobetti 101, I-40129 Bologna, Italy
11. Pulkovo Observatory, 196140 St. Petersburg, Russia
12. Nordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma, Spain
13. Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
14. Universidad de La Laguna, Departamento de Astrofisica, E-38206 La Laguna, Tenerife, Spain
15. Crimean Astrophysical Observatory RAS, P/O Nauchny 298409, Russia
16. University of Siena, Department of Physical Sciences, Earth and Environment, Astronomical Observatory, Via Roma 56, I-53100 Siena, Italy
17. Graduate Institute of Astronomy, National Central University, 300 Jhongda Road, Zhongli, Taoyuan 32001, Taiwan
18. Osservatorio Astronomico Sirio, I-70013 Castellana Grotte, Italy
19. Instituto de Astronomía, Universidad Nacional Autónoma de México, 22800 Ensenada, Baja California, Mexico
20. Engelhardt Astronomical Observatory, Kazan Federal University, 422526 Tatarstan, Russia
21. Facultad de Ciencias, Universidad Autónoma de Baja California, Campus El Sauzal, 22800 Ensenada, Baja California, Mexico
22. Astronomical Institute, Osaka Kyoiku University, Osaka 582-8582, Japan
23. Instituto Nacional de Astrofísica, Óptica y Electrónica, Tonantzintla, 72840 Puebla, Mexico
24. Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
25. Astronomical Institute, St. Petersburg State University, 198504 St. Petersburg, Russia
26. Institute of Astronomy and National Astronomical, Observatory, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria