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Explorer 21

Interplanetary Monitoring Probe, also called IMP 02


Designation 00889 / 64060A
Launch date 4 Oct 1964
Country of origin United States
Mission Scientific: magnetosphere study
Perigee/Apogee 191/95590 km
Inclination 33.5°
Period 2097 min
Launch vehicle Thor Delta #26

End of life

Decay 30 Jan 1966

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