Flight
- Date and time (UTC)
- September 29, 1972, 20:18
- Launch designation
- 1972-074
- Mission
- DS-P1-M No. 4
- Flight name
- Kosmos-521
- Vehicle flight ID
- Yu47121-11
- Year
- Launches in 1972
Orbit and payload
- Initial apogee
- 1,012 km
- Payload mass to orbit
- 0.643 t
- Payloads
- 1
- GCAT launch code
- OS
Payloads
| Payload | Designation | Owner | Mission type | Mass | Fate |
|---|---|---|---|---|---|
| Kosmos-521 | 1972-074ANORAD 6206 | Space Defence Force, USSR Armed Forces | Target | 643 kg | In orbit |
Source: GCAT launch list and payload catalogs, Jonathan C. McDowell (CC BY 4.0). Orbit values are the initial orbit reported for the launch.