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Spacecraft information: 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 | 82.987° |
| Eccentricity | 0.00369 |
| RA ascending node | 20.519 hr |
| Argument perigee | 158.387° |
| Mean anomaly | 14.693° |
| Orbital period | 104.608 min |
| Epoch of osculation | 26 Mar 2026, 09:39 |
Derived Quantities
| Min Altitude | 956.1 km |
| Mean Altitude | 983.2 km |
| Peak Altitude | 1010.4 km |
Launched alongside
SL-8 R/BOrbital History
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