Mission typeCommunications
OperatorSES Americom / SES
COSPAR ID2010-016A Edit this at Wikidata
SATCAT no.36516
Mission duration15 years (planned)
14 years, 16 days (elapsed)
Spacecraft properties
Spacecraft typeGEOStar-2
ManufacturerOrbital Sciences Corporation
Launch mass2,561 kg (5,646 lb)
Power5 kW
Start of mission
Launch date24 April 2010, 11:19:00 UTC
RocketProton-M / Briz-M
Launch siteBaikonur, Site 200/39
ContractorKhrunichev State Research and Production Space Center
Entered serviceJune 2010
Orbital parameters
Reference systemGeocentric orbit
RegimeGeostationary orbit
Longitude101° West
Band48 transponders:
24 C-band
24 Ku-band
Bandwidth36 MHz
Coverage areaCanada, United States, Mexico, Caribbean, Central America
SES-2 →

SES-1 is a geostationary communications satellite which is operated by SES World Skies, then by SES


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 SES 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° West, where it will replace the AMC-2 and AMC-4 satellites. SES-1 enables high-definition television signals to very small aperture terminals in the United States.[3]


SES-1 was built by Orbital Sciences Corporation (OSC), and is based on the Star-2.4 satellite bus. It is equipped with 24 C-band and 24 Ku-band transponders. At launch, the satellite had a mass of 2,561 kg (5,646 lb). SES-1 has a design life of fifteen years; however, the spacecraft was launched with enough fuel to operate for at least sixteen years, if all systems remain functional.[1]


The launch of SES-1 was conducted by International Launch Services (ILS), using a Proton-M launch vehicle with a Briz-M upper stage.[3] The launch occurred from Site 200/39 at the Baikonur Cosmodrome, at 11:19:00 UTC 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 2010.[5] In the end, services provided by AMC-11 were not interrupted.[6]

See also


  1. ^ a b Krebs, Gunter (11 December 2017). "SES 1, 2, 3". Gunter's Space Page. Retrieved 11 April 2021.
  2. ^ a b McDowell, Jonathan (14 March 2021). "Launch Log". Jonathan's Space Report. Retrieved 11 April 2021.
  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". SpaceNews. Archived from the original on 2 February 2013. Retrieved 21 May 2010.
  6. ^ de Selding, Peter B. (3 June 2010). "Intelsat, SES Safely Negotiate Passage of Wayward Craft". SpaceNews. Archived from the original on 7 June 2010. Retrieved 7 June 2010.