Institution: | Observatory, University of Helsinki, PO Box 14, FIN-00014 University of Helsinki, Finland;Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT;Nordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de La Palma, Canarias, Spain;Astronomy Division, PO Box 3000, 90014 University of Oulu, Finland |