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Engineering Test Satellite

OHSUMI

Name Date of launch Major objectives Remarks
OHSUMI February 1970 Development of satellite launch technologies and satellite engineering tests Japan’s first satellite, weighing 24 kg, re-entered and burnt up in the atmosphere in August 2003.

TANSEI

Name Date of launch Major objectives Remarks
TANSEI (MS-T1) February 1971 Satellite environment and functional tests after placing the satellite into orbit  
TANSEI-2 (MS-T2) February 1974 Measurement of rocket properties and satellite engineering tests  
TANSEI-3 (MS-T3) February 1977 Measurement of rocket properties and satellite engineering tests  
TANSEI-4 (MS-T4) February 1980 Measurement of rocket properties and satellite engineering tests  

KIKU

Name Date of launch Major objectives Remarks
KIKU-1 (ETS-I) September 1975 Development of technologies for launching, placing into orbit, tracing, and operating satellites  
KIKU-4 (ETS-III) September 1982 Confirmation of 3-axis attitude control and expansion of solar array paddle, experiments on active thermal control, and functional testing of ion engine operation  
KIKU-6 (ETS-VI) August 1994 Establishment of 3-axis-stabilized attitude technology for 2-ton class satellites  
KIKU-7,
ORIHIME/HIKOBOSHI (ETS-VII)
November 1997 Acquisition of data for rendezvous docking experiment and communication equipment, etc. using data relay satellites; Japan’s first rendezvous docking technology  

SAKIGAKE

Name Date of launch Major objectives Remarks
SAKIGAKE (MS-T5) January 1985 Measurement of rocket properties and satellite engineering tests Japan's first interplanetary spacecraft exploring comets, and first escape from the Earth's gravitation, SAKIGAKE was used for studying solar-wind plasma over 14 years until communication was cut in 1999.

TSUBASA

Name Date of launch Major objectives Remarks
TSUBASA (MDS-1) February 2002 Verification of element technologies required for faster, cheaper and more reliable development and operation of satellites in aerospace Verification of function of commercial parts and components

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