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COSMOS 991
Launch Details
| Launched | 27 February 1978 |
| Flight ended | – |
| Status | Unknown |
| Launch site | Plesetsk Missile and Space Complex, Russia |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 10692 |
| COSPAR ID | 1978-022A |
| Observing |
Current orbital elements
| Inclination | 82.988° |
| Eccentricity | 0.00359 |
| RA ascending node | 9.851 hr |
| Argument perigee | 196.901° |
| Mean anomaly | 277.212° |
| Orbital period | 104.611 min |
| Epoch of osculation | 28 Jun 2025, 09:57 |
Derived Quantities
| Min Altitude | 956.9 km |
| Mean Altitude | 983.3 km |
| Peak Altitude | 1009.8 km |
Orbital History
Drag the graphs below left or right to change the time range, or use your scroll wheel to zoom in or out.
Launched alongside
SL-8 R/B