Soyuz-U from Baikonur lofted Cosmos 1781, a Zenit-8 (Oblik) film-return photoreconnaissance satellite for the Soviet military, recovering camera film after a short LEO imaging flight.
- Outcome
- Success
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- 6.3 T
- Flight
- 451st
- of 714 Soyuz U flights
- Date and time
- 17 September 1986, 07:59 UTC
- Rocket
- Soyuz U
- Builder
- Progress RSC
- Launch site
- 31/6, Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Government/Top Secret
- International designator
- 1986-072
- Launches in 1986
- 77th of 110
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