Explorer 21

Interplanetary Monitoring Probe, also called IMP 02

General

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

Decay

30 Jan 1966

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