SBS 4

SBS 4

SBS 4 in the space
Mission type	Communications
Operator	SBS
COSPAR ID	1984-093B[1]
SATCAT no.	15235
Mission duration	7 years design life
Spacecraft properties
Bus	HS-376
Manufacturer	Hughes Space and Communications
Launch mass	1,117 kilograms (2,463 lb)
Start of mission
Launch date	30 August 1984, 12:41:50 (1984-08-30UTC12:41:50Z) UTC
Rocket	Space Shuttle Discovery STS-41D
Launch site	Kennedy LC-39A
Contractor	NASA
End of mission
Disposal	Decommissioned
Deactivated	September 29, 2005 (2005-09-30)
Orbital parameters
Reference system	Geocentric
Regime	Geostationary
Longitude	94° W[2]
Eccentricity	0.72775
Perigee altitude	317 kilometres (197 mi)
Apogee altitude	36,137 kilometres (22,454 mi)
Inclination	23°
Period	640.2 minutes
Epoch	August 30, 1984
Transponders
Band	14 Ku band

SBS 4 was a geostationary communications satellite designed and manufactured by Hughes (now Boeing) on the HS-376 platform. It was ordered by Satellite Business Systems, which later sold it to Hughes Communications. It had a K_u band payload and operated at 94°W longitude.^[3]

The spacecraft was designed and manufactured by Hughes on the HS-376 satellite bus. It had a launch mass of 1,117 kg (2,463 lb), a geostationary orbit and a 7-year design life.^[4]

On August 30, 1984, SBS 4 was launched by Space Shuttle Discovery in the mission STS-41D from Kennedy Space Center at 12:41:50 UTC. The satellite was launched along with the satellites Telstar 302 and Leasat 2.

On 29 September 2005, SBS 4 was finally decommissioned and put into a graveyard orbit.^[3]

• 1984 in spaceflight

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