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Spacecraft information: 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 | 8.691° |
| Eccentricity | 0.00035 |
| RA ascending node | 20.747 hr |
| Argument perigee | 84.099° |
| Mean anomaly | 275.988° |
| Orbital period | 1436.078 min |
| Epoch of osculation | 21 Jun 2026, 22:07 |
Derived Quantities
| Min Altitude | 35778.8 km |
| Mean Altitude | 35793.4 km |
| Peak Altitude | 35808.0 km |
Launched alongside
ATLAS CENTAUR R/BOrbital History
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