Vela 4A
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Vela 4A (also known Vela 7 and OPS 6638) was an American reconnaissance satellite to detect explosions and nuclear tests on land and in space. It was released together with Vela 4B, ERS 18, OV5 1 and OV5 3.
The ship remains in orbit around Earth.
Instruments
- 2 optical bhangmeters observing Earth
- 12 external X-ray detectors
- 18 internal neutron and gamma-ray detectors