| Prime contractor | Hughes |
| Platform | HS-381 |
| Mass at launch | 6895 kg (after STS crade separation) |
| Mass in orbit | 1388 kg |
| Dimension | 4.26 m diameter x 6.17 m high deployed (4.29 m stowed) |
| Stabilization | spin stabilized |
| DC power |
EOL:
1238 W Eclipse: 3 25 A-hr nickel-cadmium batteries |
| Design lifetime | 7 years |
| Telemetry & beacon | 7250 to 7500 MHz, and 7975 to 8025 MHz |