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GSAT 1 is an Indian, 1,500 kg (scaled down) test model of a future, geosynchronous communications spacecraft. It was launched by a GSLV-D1 rocket from Shriharikota (at 13 deg-N and 80 deg-E, on the eastern coast of India) at 10:13 UT on 18 April 2001. The expectation/test was on the 400 ton rocket assembly which is an augmented version of the well-proven PSLV rocket, with a third cryogenic stage; the motor for the cryogenic, hydrogen-oxygen stage had been purchased from Russia. After a series of gas burns to lift the spacecraft from the transfer orbit (180 km x 32,000 km with an inclination of 19.2 deg), and move the orbital plane to the equator, the GSAT 1 ran out of a necessary 10 kg more of fuel. Preliminary analysis revealed a shortfall of 0.5% in the thrust, probably of the third stage motor, that resulted in a short fall of the transfer orbit apogee. The fully functionally transponders and transmitters on board may be deactivated if the International Telecommunications Union so advises.

Alternate Names

  • 26745
  • GSAT1
  • GramSat 1

Facts in Brief

Launch Date: 2001-04-18
Launch Vehicle: GSLV-MkI
Launch Site: Sriharikota, India

Funding Agency

  • Indian Space Research Organization (India)


  • Communications
  • Engineering

Additional Information

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

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