Spacecraft information: UOSAT 4
| Launched | 21 January 1990 |
| Flight ended | – |
| Status | Non-operational |
| Launch site | Europe's Spaceport, Kourou, French Guiana |
| Owner | United Kingdom |
| NORAD ID | 20438 |
| COSPAR ID | 1990-005C |
| Alternative names |
UO-15 |
| Observing |
Current orbital elements
| Inclination | 98.805° |
| Eccentricity | 0.00103 |
| RA ascending node | 5.884 hr |
| Argument perigee | 32.023° |
| Mean anomaly | 27.203° |
| Orbital period | 100.580 min |
| Epoch of osculation | 02 Feb 2026, 08:56 |
Derived Quantities
| Min Altitude | 785.9 km |
| Mean Altitude | 793.2 km |
| Peak Altitude | 800.6 km |
Orbital History
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