[9] Although its operational life ended within hours due to power loss, Ohsumi remained in orbit for over 33 years before re-entering the atmosphere on August 2, 2003.

[11] Japan began to participate in the International Geophysical Year events and carried out observations of the upper atmosphere and cosmic rays through the use of K-6-type rockets that used solid propellant.

[7] The mission marked Japan's first successful feat in launching an independent satellite into orbit, making it the fourth nation to do so after the Soviet Union, the United States, and France.

[13] Despite earlier failures with the Lambda 4S series, the success of this launch highlighted Japan’s growing capabilities in space exploration and set the stage for future advancements.

[14] Two and a half hours after launch on February 11, 1970, the team at Uchinoura received the first return signal beam from Ohsumi to confirm a completed revolution around the world.

[13] The satellite craft was equipped with onboard tools to take measurements of the ionosphere, gathering data such as solar emission, temperature, and density while in orbit.

[10] The live operation ended during the satellite’s seventh revolution on February 12, when onboard power loss led to radio signal failures.