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The spacecraft was placed into a polar orbit to study Lyman-alpha, airglow, auroral emissions, solar X rays, cosmic radiation, and magnetic and electric fields. The track of the satellite followed a meridian of nearly constant local time (initially about 0100 h on the night side, with progression toward earlier times at 1 h per month). A full nightime pass between the terminators was completed in 30 min. The spacecraft was earth-oriented by gravity gradient booms.

Alternate Names

  • 02611

Facts in Brief

Launch Date: 1966-12-11
Launch Vehicle: Atlas-Agena
Launch Site: Vandenberg AFB, United States
Mass: 130 kg

Funding Agency

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


  • Space Physics
  • Engineering
  • Solar Physics
  • Astronomy

Additional Information

Questions and comments about this spacecraft can be directed to: Dr. Dieter K. Bilitza



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