| Astronomy Technology Centre, UK |
| Astron, Netherlands Foundation for Research in Astronomy, Netherlands |
| CCLRC, Rutherford Appleton Laboratory (RAL), UK |
| CEA Service d'Astrophysique, Saclay, France |
| Centre Spatial De Liège, Belgium |
| Consejo Superior de Investigaciones Científicas (CSIC), Spain |
| Danish Space Research Institute (DSRI), Denmark |
| Dublin Institute for Advanced Studies, Ireland |
| EADS Astrium Ltd, UK |
| Institut d'Astrophysique Spatiale (IAS), Orsay, France |
| Instituto Nacional de Técnica Aeroespacial (INTA), Spain |
| Laboratoire d'Astrophysique de Marseille (LAM), France |
| Max-Planck-Institut fur Astronomie (MPIA), Germany |
| Observatoire de Paris, France |
| Paul Scherrer Institut, Switzerland |
| University of Amsterdam, Netherlands |
| University of Cologne, Germany |
| University of Leicester, UK |
| University of Leiden, Netherlands |
| University of Leuven, Belgium |
| University of Stockholm, Sweden |
