GOES 4

GOES-4

GOES-D before launch
Mission type	Weather satellite
Operator	NOAA/NASA
COSPAR ID	1980-074A
SATCAT no.	11964
Mission duration	7 years (planned) 8.2 years (achieved)
Spacecraft properties
Bus	HS-371
Manufacturer	Hughes
Launch mass	660 kilograms (1,460 lb)
Start of mission
Launch date	9 September 1980, 22:27 (1980-09-09UTC22:27Z) UTC
Rocket	Delta 3914
Launch site	Cape Canaveral LC-17A
Contractor	McDonnell Douglas
End of mission
Disposal	Decommissioned
Deactivated	9 October 1988 (1988-10-10)
Orbital parameters
Reference system	Geocentric
Regime	Geostationary
Longitude	98° West (1980-1981) 135° West (1981-1983) 139° West (1983-1984) 10° West (1985) 44° West (1985-1988)
Slot	GOES-WEST (1981-1983)
Period	24 hours

GOES-4, known as GOES-D before becoming operational, was a geostationary weather satellite which was operated by the United States National Oceanic and Atmospheric Administration as part of the Geostationary Operational Environmental Satellite system.¹ Launched in 1980, it was used for weather forecasting in the United States, and later in Europe. Following its retirement it became the first satellite to be sent into a graveyard orbit.

GOES-4 was built by Hughes Space and Communications, and was based around the HS-371 satellite bus. At launch it had a mass of 660 kilograms (1,460 lb),² with an expected operational lifespan of around seven years.³ It was the first HS-371 based GOES satellite.⁴

GOES-D was launched using a Delta 3914 carrier rocket flying from Launch Complex 17A at the Cape Canaveral Air Force Station.⁵ The launch occurred at 22:27 GMT on 9 September 1980.⁶ The launch successfully placed GOES-D into a geosynchronous transfer orbit, from which it raised itself to geostationary orbit by means of an onboard Star-27 apogee motor. Its insertion into geostationary orbit occurred at 12:00 on 11 September.⁷

Following its insertion into geostationary orbit, GOES-4 was positioned at 98° West. In 1981, it was moved to 135° West, where it remained until 1983 when it was moved to 139° West (1983–1984). In 1985 it was repositioned at 10° West, and later 44° West, where it provided coverage of Europe for EUMETSAT following the failure of the Meteosat-2 spacecraft.⁸

Following the end of its operations over Europe, GOES-4 was retired from service. It became the first spacecraft to be raised out of geosynchronous orbit, into a graveyard orbit for disposal.⁹ This was accomplished on 9 November 1988, using remaining propellent in the satellite's station-keeping thrusters.