1. Nicolaus Copernicus Astronomical Centre of the Polish Academy of Sciences , ul. Bartycka 18, PL-00-716 Warsaw, Poland
2. ARDASTELLA Research Group
3. Astronomical Observatory, University of Warsaw , Al. Ujazdowskie 4, PL-00-478 Warszawa, Poland
4. Department of Physics, Astronomy, and Materials Science, Missouri State University , Springfield, MO 65897, USA
5. South African Astronomical Observatory , Observatory 7935, South Africa
6. Astronomical Institute of the Czech Academy of Sciences , Fričova 298, CZ-251 65 Ondřejov, Czech Republic
7. Astroserver.org , Fő tér 1, 8533 Malomsok, Hungary
8. Department of Physics and Astronomy, University of the Western Cape , Private Bag X17, Bellville 7535, South Africa