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SES-1 is a geostationary communications satellite which is operated by SES World Skies. It was originally ordered by SES Americom as a ground spare for AMC-5R, however in April 2008 a decision was made to launch it, and it was named AMC-1R. It was subsequently renamed AMC-4R, and finally SES-1 after SES Americom merged with SES New Skies to form SES World Skies.[1] It was the third World Skies satellite to be launched following the merger, but the first to carry the new SES designation.[2] SES-1 operates in geostationary orbit, and is intended to be located at a longitude of 101 degrees West, where it will replace the AMC-2 and AMC-4 satellites, and be used broadcast high-definition television to very small aperture terminals in the United States.[3]

Mission typeCommunication
OperatorSES World Skies
COSPAR ID2010-016A
SATCAT no.36516
Mission duration15 years (planned)
Spacecraft properties
ManufacturerOrbital Sciences
Launch mass3,170 kilograms (6,990 lb)
Start of mission
Launch date24 April 2010, 11:19:00 (2010-04-24UTC11:19Z) UTC
Launch siteBaikonur 200/39
Orbital parameters
Reference systemGeocentric
Longitude101° West (2013)
Inclination0 degrees
Period24 hours
Band24 G/H band (IEEE C band)
24 J band (IEEE Ku band)
Coverage areaC band (USA, Mexico, Caribbean, Canada, Central America)
Ku band (USA, Southern Canada, Northern Mexico)

SES-1 was built by Orbital Sciences Corporation, and is based on the Star-2.4 satellite bus. It is equipped with 24 G/H band (IEEE C band), and 24 J band (IEEE Ku band) transponders, and at launch it had a mass of 3,170 kilograms (6,990 lb). It has a design life of fifteen years, however it was launched with enough fuel to operate for at least sixteen if its systems are still functional.[1]

The launch of SES-1 was conducted by International Launch Services, using a Proton-M carrier rocket with a Briz-M upper stage.[3] The launch occurred from Site 200/39 at the Baikonur Cosmodrome, at 11:19:00 GMT on 24 April 2010.[2] The launch successfully placed SES-1 into a subsynchronous orbit close to geostationary altitude.[3][4]

In May and June 2010, SES-1 was positioned close to 131° West to temporarily provide backup to the AMC-11 satellite in the event that AMC-11 could not continue broadcasting whilst it is moved out of the way of the failed Galaxy 15 satellite, which passed close to it at the end of May.[5] In the end, services provided by AMC-11 were not interrupted.[6]

See alsoEdit


  1. ^ a b Krebs, Gunter. "SES 1, 2, 3". Gunter's Space Page. Retrieved 20 May 2010.
  2. ^ a b McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 20 May 2010.
  3. ^ a b c "SES-1 Mission Overview" (PDF). International Launch Services. Retrieved 21 May 2010.
  4. ^ Bergin, Chris (24 April 2010). "ILS Proton-M successfully launches with Orbital-built SES-1 satellite". Retrieved 21 May 2010.
  5. ^ de Selding, Peter B (17 May 2010). "SES Details Plan To Avert Interference by Failed Intelsat Craft". Space News. Retrieved 21 May 2010.
  6. ^ de Selding, Peter B (3 June 2010). "Intelsat, SES Safely Negotiate Passage of Wayward Craft". Space News. Archived from the original on 7 June 2010. Retrieved 7 June 2010.