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Communications / Broadcast Satellite

YURI

Name Date of launch Major objectives Remarks
YURI (BS) April 1978 Experimental satellite for direct broadcasting satellite systems Japan's first broadcasting satellite
YURI-2a
(BS-2a)
January 1984 Experimental satellite for direct broadcasting satellite systems (Elimination of blind spots and development of future technologies)  
YURI-2b
(BS-2b)
February 1986  
YURI-3a
(BS-3a)
August 1990 Experimental satellite for direct broadcasting satellite systems (Continuation of BS-2 broadcast services and development of advanced technologies)  
YURI-3b
(BS-3b)
August 1991  

KAKEHASHI

Name Date of launch Major objectives Remarks
KAKEHASHI (COMETS) February 1998 Communications engineering satellite that performed the maximum range of communications and functional confirmation tests on a sub-recurrent orbit  

KIRARI

Name Date of launch Major objectives Remarks
KIRARI (OICETS) August 2005 Engineering test satellite for experiments in optical communications between satellites using a laser beam A bi-directional optical communication experiment with a data relay engineering satellite was successful, in the world's first optical communication experiment between a lower orbited satellite and an optical ground station.

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