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Intelsat 27
WGS 1.jpg
Intelsat 27, built on the basis of the Boeing 702.
Mission typeCommunications
Mission duration15 years (planned)
40 seconds (achieved)
Failed to orbit
Spacecraft properties
Launch mass6,241 kg (13,759 lb)
Start of mission
Launch date1 February 2013, 06:56 (2013-02-01UTC06:56Z) UTC
Launch siteOdyssey, Pacific Ocean
ContractorSea Launch
Orbital parameters
Reference systemGeocentric
Longitude55.5° West

Intelsat 27 was an American communications satellite which was to have been operated by Intelsat. Intended as a replacement for Intelsat 805, it was destroyed after the rocket carrying it to orbit fell into the Pacific Ocean 56 seconds after launch.[1]


Based on the Boeing 702MP satellite bus, Intelsat 27 was designed to provide fifteen or more years of service to Intelsat customers in North America, South America, the Atlantic Ocean region and Europe. The spacecraft had a mass of 6,241 kilograms (13,759 lb), and was equipped with 20 C band and 20 Ku band transponders for commercial users, as well as 20 UHF transponders for military use.[2][3] Originally intended for the United States Navy, the UHF payload was to have been leased to the government of Italy following the US Department of Defense withdrawing.[2] The satellite would have been positioned at 55.5° West in geostationary orbit, co-located with Intelsat 805 and Galaxy 11.[4]


Sea Launch were contracted to launch Intelsat 27, using a Zenit-3SL carrier rocket flying from the Odyssey platform anchored in the Pacific Ocean. The rocket lifted off from Odyssey at 06:56 UTC on February 1, 2013, however shortly afterwards Sea Launch issued a statement that the launch failed "approximately 40 seconds after liftoff",[3] during first stage flight.[5] Initial indications are that the rocket's first stage engine was intentionally shut down after the vehicle went out of control. Intelsat stated that they were "clearly disappointed with the outcome of the launch".[6]

Sea Launch's Failure Review Oversight Board (FROB) found that the problem was in the hydraulic power supply unit in the Zenit-3SL's first stage.[7]

See also


  1. ^ Zenit fails in Sea Launch accident
  2. ^ a b Krebs, Gunter. "Intelsat 27". Gunter's Space Page. Retrieved 1 February 2012.
  3. ^ a b "Sea Launch Experiences a Launch Failure on Intelsat 27 Mission". Archived from the original on February 5, 2013. Retrieved 5 February 2013.
  4. ^ "Intelsat 27 Fact Sheet" (PDF). Intelsat. Archived from the original (PDF) on 2013-01-16. Retrieved 2013-02-01.
  5. ^ Bergin, Chris (1 February 2013). "Sea Launch Zenit 3SL with Intelsat 27 fails during first stage flight". Retrieved 1 February 2013.
  6. ^ "Intelsat 27 Launch Unsuccessful". Intelsat Blog. Intelsat. 1 February 2013. Archived from the original on 16 February 2013. Retrieved 1 February 2013.
  7. ^ "Failure Review Oversight Board". Sea Launch. Archived from the original on 9 May 2013. Retrieved 8 May 2013.
This page was last edited on 9 January 2021, at 20:52
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