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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 |