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ISS (Ionospheric Sounding Satellite)





A pair of Japanese satellites, launched by NASDA (National Space Development Agency) and also known by their national name Ume ("plum"), that collected data on the ionosphere to aid in short-wave radio communication. Their instruments included an ionospheric sounder, a radio noise receiver, plasma measuring equipment, and an ion mass spectrometer. Both measured 3.9 × 0.8 m and were launched by N-1 rockets from Tanegashima.


Spacecraft Launch date Orbit Mass (kg)
ISS 1 Feb. 26, 1976 988 × 1,003 km × 69.7° 139
ISS 2 Feb. 16, 1978 973 × 1,216 km × 69.4° 140


Related categories

   • JAPANESE SPACECRAFT
   • SATELLITES AND SPACE PROBES
   • JAPAN IN SPACE