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HEOS 1 was an Earth-orbiting, spin-stabilized satellite that was launched by ESA. It was basically cylindrical with an axial boom supporting the antennas and the magnetometers. The spin-axis attitude and spin rate were changed by onboard gas jets. The spacecraft objectives were to study interplanetary magnetic fields, cosmic rays, the solar wind, and the magnetosheath. The spacecraft operation was fully satisfactory for 16 months, after which intermittent loss of some solar gate pulses (attitude reference) occurred. By 1974, spacecraft telemetry coverage was 50% and only the magnetic field experiment was operational. The spacecraft reentered the Earth's atmosphere on October 28, 1975.

Alternate Names

  • 03595
  • HEOS-A
  • HEOS-A1
  • HEOS1

Facts in Brief

Launch Date: 1968-12-05
Launch Vehicle: Delta
Launch Site: Cape Canaveral, United States
Mass: 105 kg

Funding Agency

  • European Space Agency (International)


  • Space Physics

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. J. VandenkerckhoveProject ManagerESA-European Space Research and Technology Centre
Dr. Brian G. TaylorProject ScientistESA-European Space Research and Technology Centre
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