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Sealaunch Demo



DemoSat was the first Boeing Sea Launch mission. The Zenit-3SL booster rocket lifted off from the Odyssey floating platform on the equator at 154 degrees W longitude. The DemoSat payload was an instrumented dynamic model of an HS-702 satellite built by Boeing Commercial Space/Kent. Thirteen minutes after launch, the Block DM-SL upper stage completed its first burn and entered a 180 km x 735 km x 1.2 degree parking orbit. A second burn 47 minutes after launch placed the satellite in a 638 x 36,064 km x 1.2 degree geostationary transfer orbit. Three hours later, a third DM-Sl burn lowered the stage's perigee so that it would re-enter quickly.

Alternate Names

  • 25661
  • DemoSat
  • SealaunchDemo

Facts in Brief

Launch Date: 1999-03-28
Launch Vehicle: Zenit
Launch Site: Odyssey (Sea Launch Platform),
Mass: 4500 kg

Funding Agency

  • Boeing Company (United States)


  • Technology Applications

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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