We have the Fine Guidance Sensors, one of which we will exchange out of three. Another one we changed on the last servicing mission, and on the fourth servicing mission in 2003 or 2004, the third one will be exchanged.

Claude Nicollier (born 2 September 1944 in Vevey Switzerland) is the first astronaut from Switzerland and has flown on four Space Shuttle missions. He took part in two servicing missions to the Hubble Space Telescope (called STS-61 and STS-103). Nicollier retired from ESA in April 2007.