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Pioneer E was the fifth in a series of solar-orbiting, spin stabilized, solar-cell and battery powered satellites designed to obtain measurements of interplanetary phenomena from widely separated points on a continuing basis. Its experiments were to study the positive ions and electrons in the solar wind, the interplanetary electron density (radio propagation experiment), solar and galactic cosmic rays, the interplanetary magnetic field, cosmic dust, and electric fields. Due to a booster malfunction, the spacecraft was never put into orbit.

Facts in Brief

Launch Date: 1969-08-27
Launch Vehicle: Delta
Launch Site: Cape Canaveral, United States
Mass: 148.0 kg

Funding Agency

  • NASA-Office of Space Science Applications (United States)


  • Astronomy
  • Space Physics

Additional Information

Questions or comments about this spacecraft can be directed to: Coordinated Request and User Support Office.



NameRoleOriginal AffiliationE-mail
Dr. John H. WolfeProject ScientistNASA Ames Research Center 
Mr. Robert R. NunamakerGeneral ContactNASA Ames Research Center 
Mr. William R. HofstetterGeneral ContactNASA Ames Research Center 
Mr. Joseph E. LepetichGeneral ContactNASA Ames Research Center 
Mr. R. W. HoltzclawGeneral ContactNASA Ames Research Center 
Mr. Charles F. HallProject ManagerNASA Ames Research Center 
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