Taiyo (satellite)

Mission and design

Official descriptions identify Taiyo as a research platform carrying instruments for space-environment-related observations. Its payload and systems were intended to support experimental studies rather than commercial services, reflecting the Institute of Space and Astronautical Science’s experimental focus in that era. Exact instrument lists vary by source; contemporary summaries emphasize atmospheric and near‑Earth space research.

Launch and orbital life

Taiyo was launched on 24 February 1975 by a program run by the Institute of Space and Astronautical Science of the University of Tokyo. The event marked another step in Japan’s growing space program, following earlier milestone missions. After several years in orbit the satellite decayed and reentered Earth’s atmosphere, burning up on 29 June 1980.

Quick facts

• Common name: Taiyo (たいよう)
• Operator: ISAS / University of Tokyo
• Launch date: 24 February 1975
• End of orbital life: 29 June 1980 (reentry and burn-up)
• Classification: artificial satellite for scientific research

Historical context and significance

Taiyo belongs to a generation of satellites that helped Japan transition from experimental launches to more routine, institutionally supported space science. Work conducted by ISAS in the 1960s and 1970s laid groundwork for later national programs and collaborations. Over time ISAS itself became part of a larger national agency, and projects like Taiyo are often cited as early building blocks for Japan’s sustained presence in space.

Further reading

For concise mission timelines and archival details, consult institutional summaries and historical overviews of Japan’s space activities and the orbital launch record. These resources place Taiyo among other mid‑20th century research satellites and provide technical and programmatic context.