Cosmos 638

Launch data:

Mission details:

• Unmanned Soyuz test flight. Recovered April 13, 1974 5:05 GMT. Soyuz ASTP Test.
• Maneuver Summary:
  190km X 309km orbit to 190km X 266km orbit. Delta V: 12 m/s
  190km X 266km orbit to 240km X 300km orbit. Delta V: 23 m/s
  240km X 300km orbit to 258km X 274km orbit. Delta V: 12 m/s
  Total Delta V: 47 m/s.
• Officially: Investigation of the upper atmosphere and outer space.