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Spacecraft information: COSMOS 539
Launch Details
| Launched | 20 December 1972 |
| Flight ended | – |
| Status | Unknown |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 6319 |
| COSPAR ID | 1972-102A |
| Observing |
Current orbital elements
| Inclination | 74.014° |
| Eccentricity | 0.00236 |
| RA ascending node | 11.302 hr |
| Argument perigee | 31.487° |
| Mean anomaly | 141.184° |
| Orbital period | 112.903 min |
| Epoch of osculation | 12 Dec 2025, 07:18 |
Derived Quantities
| Min Altitude | 1348.8 km |
| Mean Altitude | 1367.1 km |
| Peak Altitude | 1385.3 km |
Orbital History
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