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GOES 7

NOAA weather satellite

Field	Value
name	GOES-7
image	GOES 4-5-6-7 illustration.jpg
image_caption	Artist's impression of a GOES-D series satellite
mission_type	Weather satellite
operator	NOAANASA (1987-1999)
Peacesat (1999-2012)
COSPAR_ID	1987-022A
SATCAT	17561
mission_duration	3-7 years (planned)
25 years (achieved)
spacecraft_bus	HS-371
manufacturer	Hughes
launch_date	UTC
launch_rocket	Delta 3914
launch_site	Cape Canaveral LC-17A
launch_contractor	McDonnell Douglas
disposal_type	Decommissioned
deactivated
orbit_reference	Geocentric
orbit_regime	Geostationary
orbit_periapsis	35879 km
orbit_apoapsis	35898 km
orbit_eccentricity	0.0002306
orbit_inclination	15.09°
orbit_period	24 hours
orbit_longitude	75° West (1987-1989)
98° West (1989-1992)
112° West (1992-1995)
135° West (1995-1999)
95° West (1999)
175° West (1999-2012)
orbit_slot	GOES-EAST (1987-1989)
GOES-WEST (1995-1999)
apsis	gee

Peacesat (1999-2012) 25 years (achieved)

98° West (1989-1992) 112° West (1992-1995) 135° West (1995-1999) 95° West (1999) 175° West (1999-2012) GOES-WEST (1995-1999) GOES-7, known as GOES-H before becoming operational, is an American satellite. It was originally built as a weather satellite, and formed part of the US National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite system. Originally built as a ground spare, GOES-H was launched in 1987 due to delays with the next series of satellites. It was operated by NOAA until 1999, before being leased to Peacesat, who use it as a communications satellite. As of 2009, it was operational over the Pacific Ocean, providing communications for the Pacific Islands. On April 12, 2012, the spacecraft was finally decommissioned and moved to a graveyard orbit.

Launch

GOES-H was launched aboard a McDonnell Douglas Delta 3914 rocket, flying from Launch Complex 17A at the Cape Canaveral Air Force Station. The launch occurred at 23:05 GMT on 26 February 1987. The launch had originally been scheduled for late 1986, but was delayed after GOES-G failed to achieve orbit. It was built by Hughes Space and Communications, based on the HS-371 satellite bus, and was the last of five GOES-D series satellites to be launched.

Operations

Following launch, GOES-7 was positioned in geostationary orbit at a longitude of 75° West, where it underwent on-orbit testing before being activated in the GOES-EAST slot of the constellation.

Due to the loss of GOES-G, and delays in the development of the GOES-I series spacecraft, no reserve satellites were available in the late 1980s and early 1990s. After the imager on the GOES-6 satellite failed in 1989, GOES-7 was left as the only operational GOES satellite. It was moved to 98° West to cover the whole of the continental United States. In 1992, Meteosat 3 was leased from Eumetsat to take over GOES-EAST operations, allowing GOES-8 to be moved 112° West. When GOES-8 entered service in 1995, it replaced Meteosat 3, and GOES-7 was moved to the GOES-WEST position at 135° West. It remained in service until its retirement from service in 1996, at which time it was moved to 95° West. It was then transferred to Peacesat, and positioned at 175° West until its final retirement and disposal in 2012.

It is the only satellite to have been operated as both GOES-EAST and GOES-WEST in the course of normal operations. GOES-10 has been used as both GOES-EAST and GOES-WEST, however its operations as GOES-EAST were as a backup during an outage of GOES-12, and the satellite was not moved to the GOES-EAST orbital position.

References

(1985-01-12). "International Satellite Directory - Hughes Aircraft - GOES". Flight International.
"GOES-7 Satellite". Peacesat.
(2012-04-12). "NOAA retires GOES-7 after 25 years as a weather and communications satellite". NOAA.
McDowell, Jonathan. "Launch Log". Jonathan's Space Page.
(1986-05-17). "Atlas grounding follows Delta failure". Flight International.
Krebs, Gunter. "GOES 4, 5, 6, G, 7". Gunter's Space Page.
Wade, Mark. "GOES". Encyclopedia Astronautica.
Sample, Sharron. "GOES-7". Encyclopedia Astronautica.
(1991-07-16). "GOES 'Fiasco' causes US crisis". Flight International.
(1999-04-22). "GOES-7". NASA.
(1999-06-15). "GOES-7 TRANSITIONED TO HAWAII FOR USE BY PEACESAT STATION, NOAA ANNOUNCES". NOAA.
"GOES-07". TSE.

Info: Wikipedia Source

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