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, 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.


  1. ^ a b "Sat Cat". Celestrak. Retrieved 27 June 2012.
  2. ^ a b c "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.