The first mission, Jason-1, was an altimetry satellite launched on 7 December 2001 by a Delta II launcher. It was retired of service on 1 July 2013.
Artist's view of Jason 1 and 2
The second mission, Calipso, was launched on 28 April 2006 by a Delta II launcher. Its objective is to study the radiative budget of clouds and aerosols for a better understanding of climate change.
Artist's view of Calipso
The third mission, CoRoT, was an astronomy mission launched on 27 December 2006 by a Soyuz launcher to study stellar seismology and hunt for telluric exoplanets.
Artist's view of CoRoT
The fourth mission, Smos, designed to study soil moisture, ocean salinity and the cryosphere, was launched on 2 November 2009 by a Rockot launcher.
Artist's view of Smos
The fifth mission, Jason-2 is the successor to Jason-1 and was launched on 20 June 2008 by a Delta II launcher.
Typical Proteus mission architecture