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USA 77
Launch Details
| Launched | 7 November 1991 |
| Flight ended | – |
| Status | Unknown |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 21809 |
| COSPAR ID | 1991-076E |
| Observing |
Current orbital elements
| Inclination | 63.301° |
| Eccentricity | 0.09007 |
| RA ascending node | 1.311 hr |
| Argument perigee | 67.989° |
| Mean anomaly | 301.430° |
| Orbital period | 106.396 min |
| Epoch of osculation | 28 Jun 2025, 13:39 |
Derived Quantities
| Min Altitude | 396.9 km |
| Mean Altitude | 1066.8 km |
| Peak Altitude | 1736.7 km |
Orbital History
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