Japan launches Ohsumi, becoming the fourth nation to put an object into orbit using its own booster.

The Ohsumi satellite, Japan’s first artificial satellite, was launched on February 11, 1970, at 04:25 UTC by the Institute of Space and Aeronautical Science (ISAS) from the Kagoshima Space Center, which is located on the Ohsumi peninsula in Japan. This location was chosen for its strategic position in coordinating eastward launches, optimizing the rocket's trajectory. The launch vehicle was the Lambda 4S-5, a rocket developed by the ISAS of the University of Tokyo. Such an achievement marks Japan as the fourth nation to independently place a satellite into orbit.

February 11 is the 42nd day of the year in the Gregorian calendar; 323 days remain until the end of the year.