Failed Kosmos (666) (DS-P1-Yu #70) attempt to orbit a Soviet radar-calibration test target for space-surveillance radars. Kosmos-2 (11K63) from Plesetsk Site 133/1 failed on 11 July 1974; the Kosmos 666 designation was reassigned next day.
- Outcome
- Failure
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- Did not reach orbit
- Flight
- 112th
- of 126 Kosmos 11K63 flights
- Date and time
- 11 July 1974, 10:59 UTC
- Rocket
- Kosmos 11K63
- Builder
- Yuzhmash
- Launch site
- 133/3 (133L), Plesetsk Cosmodrome, Russian Federation
- Payload
- Test Target
- Launches in 1974
- 56th of 113