| UoSAT-4 | |
| Mission Type: | OSCAR |
| Operator: | University of Surrey |
| Cospar Id: | 1990-005C[1] |
| Satcat: | 20438 |
| Manufacturer: | SSTL |
| Launch Date: | UTC |
| Launch Rocket: | Ariane 40[2] |
| Launch Site: | Kourou ELA-2 |
| Orbit Epoch: | 15 April 2019, 20:59 [3] |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Sun-synchronous |
| Orbit Periapsis: | 780km (490miles) |
| Orbit Apoapsis: | 796km (495miles) |
| Orbit Inclination: | 98.8074 degrees |
| Orbit Period: | 100.6 minutes |
| Apsis: | gee |
| Programme: | OSCAR |
| Previous Mission: | OSCAR 14 |
| Next Mission: | OSCAR 16 |
UoSAT-4, also known as UO-15 and OSCAR-15, is a British satellite in Low Earth Orbit. It was built by a spin-off company of the University of Surrey, Surrey Satellite Technology (SSTL) and launched in January 1990 from French Guiana.[1]
UoSAT-4 was launched on the same rocket as its sister satellite, UoSAT-3.[2]
UoSAT-4 carried equipment to supplement UoSAT-3, but failed after two days in orbit.[2]
The satellite forms part of the growing amounts of orbital debris orbiting around the Earth. The payload will decay in the Earth's atmosphere some time in the future.