| Prime contractor | British Aerospace (now MMS) |
| Platform | ECS |
| Mass at launch | 1056 kg |
| Payload mass | 100 kg |
| Dimension | 1.9 x 1.4 x 2.56 m |
| Solar array | 13.9 m span |
| Stabilization | 3-axis |
| DC power | EOL: 789 W |
| Design lifetime | 7 years |
| Capacity | 50 duplex voice channels |