Spacecraft information: COSMOS 539
| 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 | 74.018° |
| Eccentricity | 0.00247 |
| RA ascending node | 2.629 hr |
| Argument perigee | 246.527° |
| Mean anomaly | 286.836° |
| Orbital period | 112.903 min |
| Epoch of osculation | 15 Mar 2026, 15:19 |
Derived Quantities
| Min Altitude | 1347.9 km |
| Mean Altitude | 1367.0 km |
| Peak Altitude | 1386.2 km |
Orbital History
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