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Spacecraft information: EXPLORER 31
Launch Details
| Launched | 28 November 1965 |
| Flight ended | – |
| Status | Unknown |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 1806 |
| COSPAR ID | 1965-098B |
| Alternative names |
ISIS-X |
| Observing |
Current orbital elements
| Inclination | 79.779° |
| Eccentricity | 0.14225 |
| RA ascending node | 19.857 hr |
| Argument perigee | 11.090° |
| Mean anomaly | 351.829° |
| Orbital period | 119.166 min |
| Epoch of osculation | 19 Aug 2026, 04:46 |
Derived Quantities
| Min Altitude | 509.5 km |
| Mean Altitude | 1650.6 km |
| Peak Altitude | 2791.7 km |
Orbital History
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