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Cosmos 461



Cosmos 461 was an omnidirectional gamma-ray scintillator with a 70 x 70 mm NaI(T1) crystal and an anti-coincidence plastic sheild. The multi-channel pulse height analyzer accumulated spectra once every 6 minutes for 2 minutes. It was sensitive over the range 28 keV-4.1 MeV. It was known to have seen at least one gamma-ray burst observed by the Vela satellites. Also, it measured the diffuse gamma-ray background. The data led to 2 conclusions: the photon spectrum in the soft region was considerably steeper than was seen by Ranger 3 and above 400 keV the power law for the energy dependence breaks down.

Alternate Names

  • 05643
  • Cosmos461

Facts in Brief

Launch Date: 1971-12-02
Launch Vehicle: Kosmos-3
Launch Site: Plesetsk, U.S.S.R
Mass: 680 kg

Funding Agency

  • Unknown (U.S.S.R)


  • Astronomy

Additional Information

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

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