OperatorInstitute of Space and Astronautical Science
COSPAR ID1972-064A Edit this at Wikidata
SATCAT no.06152Edit this on Wikidata
Start of mission
Launch date19 August 1972 (1972-08-19Z) UTC[1]
Launch siteKagoshima Space Center
End of mission
Decay date19 May 1980 (1980-05-20)

Denpa (電波, denpa, literally, "electromagnetic wave"), also known as REXS (Radiation EXperiments Satellite), was a Japanese satellite.[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.[3] 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.[2]


  1. ^ "Technical details for satellite DENPA (REXS)". - Real Time Satellite Tracking and Predictions. Retrieved 9 July 2022.
  2. ^ a b Gunter's Space Page, REXS (Denpa); retrieved 2012-4-2.
  3. ^ JAXA, "Catalogue of ISAS Missions" Archived 2014-12-31 at the Wayback Machine; retrieved 2012-4-2.

See also