Soyuz-U from Baikonur lofted Kosmos 1731, a Yantar-4KS1 (Terilen) electro-optical reconnaissance satellite that digitally relayed imagery via Potok for Soviet military near-real-time imaging.
- Outcome
- Success
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- 6.6 T (est.)
- Flight
- 431st
- of 714 Soyuz U flights
- Date and time
- 7 February 1986, 08:45 UTC
- Rocket
- Soyuz U
- Builder
- Progress RSC
- Launch site
- 1/5, Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Government/Top Secret
- International designator
- 1986-013
- Launches in 1986
- 14th of 110
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