1. LESIA, Observatoire de Paris, PSL Research University, CNRS, Univ. Paris Diderot, Sorbonne Paris Cité, UPMC Univ., Paris 06, Sorbonne Universités, 5 Place J. Janssen, Meudon Pricipal Cedex F-92195, France
2. Astronomical Institute of the Romanian Academy, 5 Cuţitul de Argint, 040557 Bucharest, Romania
3. INAF-Osservatorio Astronomico di Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Rome, Italy
4. IAS, UMR 8617, CNRS, Université Paris-Sud, Bat 121, F-91405 Orsay, France
5. Institute of Astronomy, V.N. Karazin Kharkiv National University, 35 Sumska Str, UA-61022 Kharkiv, Ukraine