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The satellite had an octagonal configuration, was spin-stabilized, and was placed in a moderately eliptical earth orbit (eccentricity - 0.670) by a Titan 3C on May 25, 1969. The purpose of the satellite was to monitor x-ray, electron, and proton radiation associated with solar activity in order to develop data handling techniques in near real-time for use by the Air Weather Service Forecast Center in forecasting solar flares.

Alternate Names

  • ERS 26
  • 03951

Facts in Brief

Launch Date: 1969-05-23
Launch Vehicle: Titan
Launch Site: Vandenberg AFB, United States
Mass: 23 kg

Funding Agency

  • Department of Defense-Department of the Air Force (United States)


  • Space Physics

Additional Information

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



NameRoleOriginal AffiliationE-mail
Mr. C. H. ReynoldsProject ManagerPhillips Laboratory (nee USAF Geophysics Lab, nee Cambridge Labs)
Capt F. ZimmermanGeneral ContactPhillips Laboratory (nee USAF Geophysics Lab, nee Cambridge Labs)
Dr. G. Kenneth YatesProject ScientistPhillips Laboratory (nee USAF Geophysics Lab, nee Cambridge Labs)
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