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The Communications and Broadcasting Engineering Test Satellite (COMETS) was a research and development satellite aimed at developing new technology in communications and broadcasting fields such as inter-orbit communications, advanced satellite broadcasting, advanced mobile satellite communications, and upgrading large geostationary satellites. It was to be used for conducting experiments and verifying the above subjects. The planned lifetime of the mission was to be three years, but a failure in the second stage of the H-II launch vehicle resulted in a highly eccentric orbit and prevented the spacecraft from attaining its planned geostationary orbit.

Alternate Names

  • 25175
  • Communications and Broadcasting Engineering Test Satellite
  • Kakehashi

Facts in Brief

Launch Date: 1998-02-21
Launch Vehicle: H-2
Launch Site: Tanegashima, Japan
Mass: 2000 kg

Funding Agency

  • National Space Development Agency (NASDA) (Japan)


  • Communications
  • Engineering

Additional Information

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

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