Affiliation: | Institute for Astronomy, The University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ; Instituto Astronônomico e Geofísico, USP, Av. Miguel Stefano 4200, 04301-904 Sâo Paulo, SP, Brazil; Royal Greenwich Observatory, Madingley Road, Cambridge CB3 0EZ; Instituto Nacional de Astrofísica, Optica y Electrónica, Av. Luis Enrique Erro 1, Tonanzintla, Puebla, Mexico |