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Spacecraft information: 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 | 94.098° |
| Eccentricity | 0.00601 |
| RA ascending node | 2.549 hr |
| Argument perigee | 131.200° |
| Mean anomaly | 229.446° |
| Orbital period | 93.394 min |
| Epoch of osculation | 12 Dec 2025, 03:16 |
Derived Quantities
| Min Altitude | 406.8 km |
| Mean Altitude | 447.8 km |
| Peak Altitude | 488.8 km |
Launched alongside
PEGSATOrbital History
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