|Owner(s).||Originally owned by the UK MoD, but now Paradigm Secure Communications, a subsidiary of Airbus Defence and Space.|
|Major contractor(s) .||British Aerospace Dynamics (BAe Dynamics), but bought by Airbus Group SE|
|Is it still in orbit.||Yes.|
|Launch mass.||800 kg.|
|Nationality(s).||UK, but later EU/NATO.|
|Satellite type.||Military communications satellites.|
Skynet 4 satellites have few similarities to the earlier generations. The cylindrical body of Skynet 1 and 2 was replaced by a large square body housing antennas with deployable solar-cell arrays. This marks the technological improvement from spin-stabilisation, used in earlier cylindrical satellites, to three-axis stabilisation using momentum wheels and reaction wheels controlling the satellite gyroscopically.