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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.

Alternate Names

    Facts in Brief

    Launch Date: 1969-08-27
    Launch Vehicle: Delta
    Launch Site: Cape Canaveral, United States
    Mass: 148 kg

    Funding Agency

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


    • Space Physics
    • Astronomy

    Additional Information

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



    NameRoleOriginal AffiliationE-mail
    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. Charles F. HallProject ManagerNASA Ames Research Center
    Mr. R. W. HoltzclawGeneral ContactNASA Ames Research Center
    Dr. John H. WolfeProject ScientistNASA Ames Research Center
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