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BS-3A (Broadcasting Satellite-3A) was launched by the H-I launch vehicle (H22F) from the Tanegashima Space Center in Japan. A follow-on to the BS-2 series providing direct boradcast service to all of Japan and the islands of Okinawa and Ogasawara, BS-3A featured more transponder output - from 100 to 120 W, an added channel - from 2 to 3, and longer life - from 5 to 7 years. An experimental 20-W wideband transponder tested high-definition TV transmission. The payload operated at 14/12 GHz. Built by GE Astro Space and Nippon Electric Company, the satellite was based on GE's SATCOM 3000 bus and incorporated Japanese transponders, antenna and apogee kick motor. The box-shaped satellite measured 1.3 by 1.6 by 1.6 m, spanning 15 m with solar panels deployed. The shaped beam parabolic antenna extended overall height to 3.2 m on orbit. The arrays provided 1,443 W at beginning of life. As is customary with Japanese launches, the satellite was renamed in flight. Yuri (lily) reached its assigned geosynchronous station at 110 deg. e. in October. Operations were turned over to the Telecommunications Satellite Company of Japan.

Alternate Names

  • 20771
  • Yuri 3A

Facts in Brief

Launch Date: 1990-08-28
Launch Vehicle: H-I
Launch Site: Tanegashima, Japan
Mass: 550 kg
Nominal Power: 1443 W

Funding Agency

  • National Space Development Agency (NASDA) (Japan)


  • Communications

Additional Information

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

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