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Designation 07531 / 74089C
Launch date 15 Nov 1974
Country of origin Spain
Mission Scientific: ionosphere study
Perigee/Apogee 1441/1455 km
Inclination 101.9°
Period 114.8 min
Launch vehicle Thor Delta #104
Mass at launch 24.5 kg

Studies the ionosphere's density and its movement throughout the year.

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