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Vela 4B



Vela 4B was one of two spin-stabilized satellites which comprised the fourth launch in a series of six Vela launches. The orbits of the two satellites on each launch were basically circular at about 17 earth radii and spaced 180 deg apart. Their objectives were to study x-rays, gamma-rays, EUV, magnetic fields, and particles over a wide range of energies from solar wind to cosmic ray as the satellites passed through interplanetary space, the bow shock, magnetosheath and magnetotail. Vela 4B operated well from launch until August 1, 1972, when tracking operations ceased.

Alternate Names

  • 02766
  • Vela 4 (USAF)
  • Vela 8 (TRW)
  • Vela4B

Facts in Brief

Launch Date: 1967-04-28
Launch Vehicle: Titan III-C
Launch Site: Cape Canaveral, United States
Mass: 231 kg

Funding Agency

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


  • Surveillance and Other Military
  • Space Physics
  • Astronomy

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. James H. CoonProject ScientistLos Alamos National Laboratory
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