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Spacecraft information: USA 56
Launch Details
| Launched | 10 April 1990 |
| Flight ended | – |
| Status | Unknown |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 20560 |
| COSPAR ID | 1990-031A |
| Observing |
Current orbital elements
| Inclination | 89.858° |
| Eccentricity | 0.00598 |
| RA ascending node | 17.625 hr |
| Argument perigee | 212.479° |
| Mean anomaly | 147.275° |
| Orbital period | 97.476 min |
| Epoch of osculation | 12 Dec 2025, 06:56 |
Derived Quantities
| Min Altitude | 603.1 km |
| Mean Altitude | 645.0 km |
| Peak Altitude | 687.0 km |
Launched alongside
USA 57 USA 58 ATLAS 28E R/B ATLAS 28E DEB ATLAS 28E DEB ATLAS 28E DEB ATLAS 28E DEB USA 56-58 DEBOrbital History
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