1. Oukaimeden Observatory, PHEA Laboratory, Cadi Ayyad University , BP 2390 Marrakech, Morocco
2. Johns Hopkins University Applied Physics Laboratory , Laurel, MD 20723, USA
3. NASA NExSS Virtual Planetary Laboratory , University of Washington, Box 351580, Seattle, WA 98195, USA
4. Center for Astrophysics | Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
5. Departamento de Fisica e Astronomia, Faculdade de Ciencias , Universidade do Porto, Rua do Campo Alegre, P-4169-007 Porto, Portugal
6. Instituto de Astrofisica e Ciencias do Espaco, Universidade do porto , CAUP, Rua das Estrelas, P-150-762 Porto, Portugal