Kosmos 257 (DS-P1-Yu No.17), a Soviet radar-calibration target for air-defense and space-surveillance radars. Kosmos-2 (11K63) from Plesetsk Site 133/1 lofted it on 3 December 1968 into LEO; decayed 5 March 1969.
- Outcome
- Success
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- 200 kg
- Flight
- 33rd
- of 126 Kosmos 11K63 flights
- Date and time
- 3 December 1968, 14:52 UTC
- Rocket
- Kosmos 11K63
- Builder
- Yuzhmash
- Launch site
- 133/3 (133L), Plesetsk Cosmodrome, Russian Federation
- Payload
- Test Target
- International designator
- 1968-107
- Launches in 1968
- 116th of 128
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