BackForward Satellite Programme: Harmony 

Programme details
Programme description
  • Harmony is the tenth ESA Earth Explorer mission.
  • Harmony is a constellation of two SAR (Synthetic Aperture Radar) equipped satellites operated by the European Space Agency (ESA) as an Earth Explorer mission, which will run in tandem with a Sentinel-1 satellite. 
  • Sun-synchronous orbit 350 km in front and behind Sentinel-1 satellite.
  • Lifetime of each satellite is 5 years.
  • More information here.
Data circulation
Agencies ESA
Programme lifetime 2029 - 2034
Associated satellites and instruments

Note: red tag => no longer operational , green tag => operational , blue tag => planned