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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
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