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ESIAFI 1
Launch Details
| Launched | 20 February 1981 |
| Flight ended | – |
| Status | Non-operational |
| Launch site | Air Force Eastern Test Range, Florida, USA |
| Owner | United States |
| NORAD ID | 12309 |
| COSPAR ID | 1981-018A |
| Alternative names |
COMSTAR 4 |
| Observing |
Current orbital elements
| Inclination | 9.374° |
| Eccentricity | 0.00032 |
| RA ascending node | 20.902 hr |
| Argument perigee | 103.616° |
| Mean anomaly | 256.489° |
| Orbital period | 1436.122 min |
| Epoch of osculation | 02 Jul 2025, 20:47 |
Derived Quantities
| Min Altitude | 35780.7 km |
| Mean Altitude | 35794.2 km |
| Peak Altitude | 35807.7 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
ATLAS CENTAUR R/B