24 C-band transponders and 36 Ku-band transponders. Also carries hosted L-band payload for the European Commission?s European Geostationary Navigation Overlay Service (EGNOS).
52 Ku-band and 2 Ka-band transponders; service to Europe and sub-Saharan Africa.
Originally two scientific disciplines on a single spacecraft in studies of star formation/early solar system (astronomy) and of the mechanisms behind the depletion of the ozone layer in the earth atmosphere and the effects of global warming (aeronomy); astronomy mission has ended.