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]

Mission typeOSCAR
OperatorUniversity of Surrey
COSPAR ID1990-005C[1]
SATCAT no.20438
Spacecraft properties
Start of mission
Launch date22 January 1990, 01:35:27 (1990-01-22UTC01:35:27Z) UTC
RocketAriane 40[2]
Launch siteKourou ELA-2
Orbital parameters
Reference systemGeocentric
Perigee altitude780 km (480 mi)
Apogee altitude796 km (495 mi)
Inclination98.8074 degrees
Period100.6 minutes
Epoch15 April 2019, 20:59 [3]

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.


  1. "Sat Cat". Celestrak. Retrieved 27 June 2012.
  2. "UoSat 3, 4, 5 (UO 14, 15, 22 / Oscar 14, 15, 22) / Healthsat 1". Gunter's Space Page. Retrieved 27 June 2012.
  3. "Oscar 15 - Orbit". Heavens-Above. 15 April 2019. Retrieved 16 April 2019.

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