GOES 12

Last updated
GOES-12
GOES-M processing.jpg
GOES-M during processing
Mission type Weather satellite
Operator NOAA  / NASA
COSPAR ID 2001-031A OOjs UI icon edit-ltr-progressive.svg
SATCAT no. 26871
Mission duration5 years (planned)
12 years (achieved)
Spacecraft properties
Bus LS-1300
Manufacturer Space Systems/Loral
Launch mass2,279 kilograms (5,024 lb)
Start of mission
Launch date23 July 2001, 07:23 (2001-07-23UTC07:23Z) UTC
Rocket Atlas IIA
Launch site Cape Canaveral SLC-36A
Contractor ILS
End of mission
DisposalDecommissioned [1] [2]
DeactivatedAugust 16, 2013, 13:00 (2013-08-16UTC14Z) UTC
Orbital parameters
Reference system Geocentric
Regime Geostationary
Longitude90° West (2001-2003)
75° West (2003-2010)
60° West (2010-2013)
SlotGOES-East (2003-2010)
GOES-South (2010-2013)
Eccentricity 0.0007626
Perigee altitude 36,075 kilometres (22,416 mi)
Apogee altitude 36,140 kilometres (22,460 mi)
Inclination 5.6472°
Period 24 hours
RAAN 62.9959°
Argument of perigee 221.8848°
Mean anomaly 79.0106°
 

GOES-12, known as GOES-M before becoming operational, is an American weather satellite, which is part of the US National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite system. It was launched on July 23, 2001, [3] and spent its first 21 months in space as an on-orbit spare. From April 2003, the satellite took over the GOES-East position, providing coverage of the eastern half of the continental United States. In April 2010, GOES-East operations were taken over by GOES-13, and GOES-12 transitioned to the GOES-South location to devote time to South American imagery. [4] It remained at this post until it was decommissioned on August 16, 2013 [3] and subsequently boosted to a graveyard orbit.

Contents

Launch

Launch of GOES-12 GOES-M launch.jpg
Launch of GOES-12

GOES-M was launched aboard an International Launch Services Atlas IIA rocket, [5] flying from Space Launch Complex 36A at the Cape Canaveral Air Force Station. The launch occurred at 07:23 GMT on 23 July 2001, [6] having previously been delayed eight days; seven due to a faulty controller in the second stage of the carrier rocket, and one to ensure that a lightning strike at SLC-36B had not caused any damage to the rocket. [7] At launch, the satellite had a mass of 2,279 kilograms (5,024 lb), and an expected operational lifespan of five years, although it carried fuel for longer. [8] It was built by Space Systems/Loral, based on the LS-1300 satellite bus, and was the last of five GOES-I series satellites to be launched.

Operations

Following launch, it was positioned in geostationary orbit at a longitude of 90° West, where it underwent on-orbit testing, and was then stored until it was needed to replace an operational satellite. It served as an on-orbit spare until 2003, when it was called up to replace GOES-8, an older satellite which, while still operational, would have run out of fuel by the end of the year. [9] Although GOES-11 was the next backup in line for activation, GOES-12 was used instead in order to test its Solar X-ray Imager. [7] The Solar X-ray Imager failed in April 2013

Thruster problems

Since December 2007, GOES-12 has experienced three thruster leaks during orbital adjustment manoeuvres, two of which led to major outages. The first of these occurred in December 2007, during an annual manoeuvre to reduce the inclination of the satellite's orbit. The faulty thruster was shut down, and the satellite was returned to its station by means of what was thought at the time to be a backup thruster. It was later discovered that the primary and backup thrusters had been wired the wrong way around, so it had actually switched from the backup system to the primary system, however this was believed to be unrelated to the failure. [7] During this outage, GOES-10, a retired satellite which had been kept in orbit to provide coverage of South America, was briefly returned to service to cover for GOES-12. [10]

Another outage occurred on 14 December 2008, when an inactive thruster leaked, sending the satellite out of control. The on-orbit-spare satellite, GOES-13, was brought online in case GOES-12 had to be replaced, and took over imagery from its storage location at 105° West while the fault was investigated. The problem cleared several weeks later, and the satellite was returned to operational status on 5 January 2009, with GOES-13 being returned to on-orbit storage. [10]

Since then, several other leaks have occurred, however none has impacted operations. [11] During a leak in May 2009, the GOES-13 satellite was again activated, however it did not need to take over operations. Because of the thruster problems, GOES-12 was replaced by GOES-13 in the GOES-East position.

GOES-12 was decommissioned on August 16, 2013. [3]

See also

Related Research Articles

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References

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  2. GOES-12 status Archived 2006-09-29 at the Wayback Machine
  3. 1 2 3 "GOES Status". NOAA. 2010-04-14. Retrieved 2010-04-27.
  4. "GOES-NEWS". NASA. 2009-05-09. Archived from the original on 2004-06-05. Retrieved 2009-07-09.
  5. Wade, Mark. "FS 1300". Encyclopedia Astronautica. Archived from the original on 2009-07-05. Retrieved 2009-07-09.
  6. McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 2009-07-09.
  7. 1 2 3 "GOES-12 Status". NOAA. Archived from the original on 2004-10-30. Retrieved 2009-07-09.
  8. Krebs, Gunter. "GOES 8, 9, 10, 11, 12". Gunter's Space Page. Retrieved 2009-07-09.
  9. "GOES 8/12 Transition Plan" (PDF). NASA. 2002-10-28. Archived from the original (PDF) on 2004-10-30. Retrieved 2009-07-09.
  10. 1 2 "GOES 12 [GOES-M]". Failures. Sat ND. Archived from the original on 2011-10-05. Retrieved 2009-07-09.
  11. "CLASS News". NOAA. Archived from the original on 2009-06-25. Retrieved 2009-07-09.