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Spacecraft information: OPS 4311
Launch Details
| Launched | 13 October 1971 |
| Flight ended | – |
| Status | Non-operational |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 5557 |
| COSPAR ID | 1971-087A |
| Alternative names |
DMSP 5B F1 |
| Observing |
Current orbital elements
| Inclination | 99.014° |
| Eccentricity | 0.00511 |
| RA ascending node | 12.329 hr |
| Argument perigee | 148.152° |
| Mean anomaly | 212.277° |
| Orbital period | 100.806 min |
| Epoch of osculation | 26 Mar 2026, 06:38 |
Derived Quantities
| Min Altitude | 767.3 km |
| Mean Altitude | 804.0 km |
| Peak Altitude | 840.6 km |
Launched alongside
THOR BURNER 2 R/BOrbital History
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