1. GEPI, Observatoire de Paris, Université PSL, CNRS, Place Jules Janssen, F-92195 Meudon, France
2. Université de Strasbourg, CNRS, Observatoire astronomique de Strasbourg, UMR 7550, F-67000, France
3. Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
4. Laboratoire d’Astrophysique, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland
5. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117, Heidelberg, Germany
6. European Southern Observatory, Alonso de Cordova 3109, Vitacura, Santiago, Chile
7. AAVSO, Cambridge, MA 02138, USA
8. Dipartimento di Fisica e Astronomia, Universitá degli Studi di Firenze, Via G. Sansone 1, I-50019 Sesto Fiorentino, Italy
9. INAF/Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
10. Instituto de Astrofísica de Canarias, Vía Láctea, 38205, La Laguna, Tenerife
11. Institute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UK
12. Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, Bd de l’Observatoire, CS 34229, F-06304 Nice cedex 4, France
13. Department of Physics and Astronomy, University of Victoria, PO Box 3055, STN CSC, Victoria, BC V8W 3P6, Canada
14. STFC UK Astronomy Technology Centre, The Royal Observatory Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UK
15. Department of Astronomy & Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada