, also known as REXS (Radiation EXperiments Satellite), was a Japanese satellite.Gunter's Space Page, REXS (Denpa); retrieved 2012-4-2. The launch was a project of the Institute of Space and Astronautical Science of the University of Tokyo. The satellite was launched on February 19, 1972.JAXA, "Catalogue of ISAS Missions" ; retrieved 2012-4-2. Its objective was to conduct measurements in the magnetosphere. It failed shortly after launch; a later report concluded that the transmitter failed due to a high voltage arc.
References
See also Japan Aerospace Exploration Agency (JAXA), Denpa (REXS) mission profile