The International Earth Rotation and Reference Systems Service (IERS)
The International VLBI Service for Geodesy and Astrometry (IVS)
L'Observatoire de Paris, France
The United States Naval Observatory, Washington, DC (USNO)
The NASA Goddard Space Flight Center, Greenbelt, MD (NASA/GSFC)
Bundesamt für Kartographie und Geodäsie, Leipzig, Germany
The VLBI group of the Institut for Geodesy and Geoinformation, University of Bonn, Germany
The Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kiev (MAO)
The Institute of Applied Astronomy of Saint Petersburg, Russia (IAA)
Le Centre de Données astronomiques de Strasbourg, France
L'Observatoire Virtuel-OBSPM, France