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OV1-21 was one of two OV spacecraft simultaneously placed into orbit from a single launch vehicle. It carried two known experiments -- a velocity mass spectrometer that measured ion densities composition and temperature, and a VLF experiment that consisted of two 18.3-m-long ELF/VLF dipole antennas and a transreceiver that operated in 14 narrow bands and one broad band. The satellite also served as a launching platform for eight spherical research satellites (71-067D through 71-067K). OV1-21 was cylindrical in shape measuring approximately 2 m in length and 0.6 m in diameter.

Alternate Names

  • 05397
  • SESP 70-2B

Facts in Brief

Launch Date: 1971-08-07
Launch Vehicle: Atlas
Launch Site: Vandenberg AFB, United States
Mass: 70 kg

Funding Agency

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


  • Earth Science

Additional Information

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



NameRoleOriginal AffiliationE-mail
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