What countries were involved in the Magellan space satellite?

It was built by NASA (the US), with contributions from the European Space Agency (France, Germany, Italy, the UK, Spain, Belgium, the Netherlands, Switzerland, Sweden, Denmark, Ireland, Norway, and Austria at the time the Hubble was launched; since then six additional countries (and the European Union as a whole) have joined - in addition, Canada is an "associate member", and has been since the very early days of the ESA).