Flight
- Date and time (UTC)
- April 4, 1974, 08:30
- Launch designation
- 1974-019
- Mission
- Zenit-4MK
- Flight name
- Kosmos-639
- Vehicle flight ID
- 76043 -734
- Year
- Launches in 1974
Orbit and payload
- Initial apogee
- 402 km
- Payload mass to orbit
- 6.0 t
- Payloads
- 1
- GCAT launch code
- OS
Payloads
| Payload | Designation | Owner | Mission type | Mass | Fate |
|---|---|---|---|---|---|
| Kosmos-639 | 1974-019ANORAD 7240 | Main Space Forces Directorate | Optical imaging | 2,310 kg | Landed · Apr 15, 1974 |
Source: GCAT launch list and payload catalogs, Jonathan C. McDowell (CC BY 4.0). Orbit values are the initial orbit reported for the launch.