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RADIO 4
Launch Details
| Launched | 16 December 1981 |
| Flight ended | – |
| Status | Unknown |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 13000 |
| COSPAR ID | 1981-120D |
| Observing |
Current orbital elements
| Inclination | 82.963° |
| Eccentricity | 0.00191 |
| RA ascending node | 14.023 hr |
| Argument perigee | 21.195° |
| Mean anomaly | 349.994° |
| Orbital period | 119.312 min |
| Epoch of osculation | 15 Sep 2025, 03:14 |
Derived Quantities
| Min Altitude | 1641.9 km |
| Mean Altitude | 1657.2 km |
| Peak Altitude | 1672.5 km |
Orbital History
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