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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 | 65.829° |
| Eccentricity | 0.00015 |
| RA ascending node | 3.788 hr |
| Argument perigee | 98.312° |
| Mean anomaly | 2.698° |
| Orbital period | 104.920 min |
| Epoch of osculation | 22 Apr 2024, 05:44 |