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Explorer 28

Interplanetary Monitoring Probe, also called IMP 03


Designation 01388 / 65042A
Launch date 29 May 1965
Country of origin United States
Mission Scientific: magnetosphere study
Perigee/Apogee 229/261206 km
Inclination 30.5°
Period 8419.7 min
Launch vehicle Thor Delta #31

End of life

Decay 4 Jul 1968

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