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COSMOS 521
Launch Details
| Launched | 28 September 1972 |
| Flight ended | – |
| Status | Unknown |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 6206 |
| COSPAR ID | 1972-074A |
| Observing |
Current orbital elements
| Inclination | 65.827° |
| Eccentricity | 0.00216 |
| RA ascending node | 13.086 hr |
| Argument perigee | 267.100° |
| Mean anomaly | 184.055° |
| Orbital period | 104.918 min |
| Epoch of osculation | 09 May 2025, 12:00 |