Mission type OSCAR
Operator University of Surrey
COSPAR ID 1990-005C[1]
SATCAT № 20438
Spacecraft properties
Manufacturer SSTL
Start of mission
Launch date 22 January 1990, 01:35:27 (1990-01-22T01:35:27Z) UTC
Rocket Ariane 40[2]
Launch site Kourou ELA-2
Orbital parameters
Reference system Geocentric
Regime Sun-synchronous
Inclination 98 degrees

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.