1. Tuparev AstroTech , 3 Sofiyiski Geroi Str., Sofia 1612, Bulgaria
2. Astrosysteme Austria , Galgenau 19, A-4212 Neumarkt im Mühlkreis, Austria
3. Astronomisches Rechen-Institut , Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, D-69120 Heidelberg, Germany
4. INAF − Osservatorio Astronomico di Capodimonte , sal. Moiariello 16, Napoli, I-80131, Italy
5. Inter University Centre for Astronomy and Astrophysics , Ganeshkhind, Pune 411007, India
6. Kavli Institute for the Physics and Mathematics of the Universe (WPI) , 5-1-5 Kashiwanoha, Kashiwa 2778583, Japan