Kosmos 399 (Zenit-4M #12, Rotor), a Soviet high-resolution film-return photoreconnaissance satellite. Voskhod from Baikonur LC-31/6 placed it in LEO for optical imaging; recoverable capsule returned after about two weeks on 17 March.
- Outcome
- Success
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- 6 T
- Flight
- 147th
- of 299 Voskhod flights
- Date and time
- 3 March 1971, 09:30 UTC
- Rocket
- Voskhod
- Builder
- RKK Energia
- Launch site
- 31/6, Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Government/Top Secret
- International designator
- 1971-017
- Launches in 1971
- 18th of 133
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