1. Département de Recherche Spatiale, Observatoire de Paris (Section de Meudon), 92195 Meudon Principal Cedex, France
2. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822
3. Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 169-237, 4800 Oak Grove Drive, Pasadena, CA 91109
4. Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014, Paris, France
5. Lowell Observatory, Mars Hill Road, 1400 West, Flagstaff, AZ 86001