| Mission type | Photographic reconnaissance |
|---|---|
| Operator | US Air Force / NRO |
| Harvard designation | 1961 Epsilon 1 |
| COSPAR ID | 1961-005A |
| SATCAT no. | 00083 |
| Spacecraft properties | |
| Spacecraft type | KH-5 ARGON |
| Bus | Agena-B |
| Manufacturer | Lockheed |
| Launch mass | 1110 kg |
| Start of mission | |
| Launch date | 17 February 1961, 20:24:00 GMT |
| Rocket | Thor DM-21 Agena-B (Thor 298) |
| Launch site | Vandenberg, SLC-1 Launch pad 75-3-4 |
| End of mission | |
| Decay date | 28 July 1962 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Perigee altitude | 288 km[1] |
| Apogee altitude | 786 km |
| Inclination | 80.91° |
| Period | 95.81 minutes |
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Discoverer 20, also known as KH-5 9014A, was a USAF photographic reconnaissance satellite under the supervision of the National Reconnaissance Office (NRO) which was launched in 1961. Discoverer 20 was the first KH-5 ARGON satellite to be launched.[2]
- ^ "NASA - NSSDCA - Spacecraft - Telemetry Details". nssdc.gsfc.nasa.gov.
- ^ "NASA - NSSDCA - Master Catalog - Spacecraft Query". nssdc.gsfc.nasa.gov.