Vela 5A

Vela 5A (also known Vela 9 and OPS 6909 ) was an American reconnaissance satellite to detect explosions and nuclear tests on land and in space. It was released together with Vela 5B, OV5 5, OV5 6 and OV5 9.

Instruments

 * 2 optical bhangmeters observing the planet
 * 12 external X-ray detectors
 * 18 internal neutron and gamma-ray detectors