Launch Date Mar. 27, 1964
Launch Site Baikonur Cosmodrome, Kazakhstan, Russia | Launch Site 1
Destination Venus
Type Impact
Status Unsuccessful
Nation Soviet Union
Alternate Names 1964-014A, 00770


This Soviet spacecraft was designed to study Venus as it passed through the planet's atmosphere and crashed on the surface.


None. Though the spacecraft successfully reached Earth orbit, the rocket that was to propel it onward to Venus failed and the spacecraft burned up in Earth's atmosphere the following day.

In Depth

The probe, designed to accomplish atmospheric entry into Venus, successfully reached Earth orbit but failed to leave for Venus when the Blok L upper stage malfunctioned. The upper stage evidently lost stable attitude due to a failure in the circuit of the power supply for the attitude-control system.

The spacecraft burned up in Earth's atmosphere the following day. Had this mission been successful, it would probably have been given a Zond designation.


Launch Vehicle: 8K78 (no. T15000-22)

Spacecraft Mass: 948 kg

Spacecraft Instruments:

  1. barometer
  2. thermometer
  3. radiation detector
  4. micro-organism detection experiment
  5. atmospheric composition experiment
  6. acidity measurement experiment
  7. electro-conductivity experiment
  8. luminosity experiment

Additional Resources

National Space Science Data Center Master Catalog: Kosmos 27

Selected References

Siddiqi, Asif A. Deep Space Chronicle: A Chronology of Deep Space and Planetary Probes 1958-2000, NASA, 2002.

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