Flight
- Date and time (UTC)
- February 17, 1961, 20:25
- Launch designation
- 1961 EPS
- Mission
- ARGON 1
- Flight name
- Discoverer 20
- Vehicle flight ID
- 298/1104
- Flight code
- TAG020/SPIRIT LEVEL
- Year
- Launches in 1961
Orbit and payload
- Initial apogee
- 790 km
- Payload mass to orbit
- 1.0 t
- Payloads
- 3
- GCAT launch code
- OS
Payloads
| Payload | Designation | Owner | Mission type | Mass | Fate |
|---|---|---|---|---|---|
| Discoverer 20 | 1961 EPS 1NORAD 83 | US Air Force Ballistic Missile Division | Optical imaging | 108 kg | Reentered attached to another object · Jul 28, 1962 |
| SRV 520 | 1961 EPS 4NORAD 90 | US Air Force Ballistic Missile Division | Reentry vehicle | 127 kg | Reentered (orbital decay) · Oct 31, 1961 |
| TOD-8 | 1961 EPS 1 | US Air Force Ballistic Missile Division | — | — | — |
Source: GCAT launch list and payload catalogs, Jonathan C. McDowell (CC BY 4.0). Orbit values are the initial orbit reported for the launch.