1. Armagh Observatory and Planetarium, College Hill, Armagh BT61 9DG, United Kingdom
2. Institute of Astronomy and NAO, Bulgarian Academy of Sciences, 72, Tsarigradsko Chaussée Blvd., BG-1784 Sofia, Bulgaria
3. Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA
4. INAF - Osservatorio Astrofisico di Torino, via Osservatorio 20, I-10025 Pino Torinese (TO), Italy
5. Université Côte d’Azur, Observatoire de la Côte d’Azur, F-06304 Nice, France
6. Institute of Astronomy of Kharkiv National University, Sumska Str 35, Kharkiv UA-61022, Ukraine
7. Astronomy and Astrophysics Group, Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom
8. Monash Centre for Astrophysics, School of Physics & Astronomy, Monash University, Clayton VIC 3800, Australia
9. Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom
10. Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, United Kingdom
11. National Astronomical Research Institute of Thailand, 191 Siriphanich Bldg, Huay Kaew Road, Muang District, Chiang Mai 50200, Thailand