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USA 55
Launch Details
| Launched | 4 April 1990 |
| Flight ended | – |
| Status | Unknown |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 20547 |
| COSPAR ID | 1990-028B |
| Observing |
Current orbital elements
| Inclination | 94.106° |
| Eccentricity | 0.00681 |
| RA ascending node | 4.245 hr |
| Argument perigee | 253.646° |
| Mean anomaly | 105.729° |
| Orbital period | 93.984 min |
| Epoch of osculation | 22 Apr 2024, 09:45 |
Derived Quantities
| Min Altitude | 429.8 km |
| Mean Altitude | 476.5 km |
| Peak Altitude | 523.1 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
PEGSAT