Soyuz-U from Baikonur lofted Kosmos 1728, a Zenit-8 (Oblik) film-return photoreconnaissance satellite for Soviet military cartographic imaging from low Earth orbit; recovered after about two weeks.
- Outcome
- Success
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- 6.3 T
- Flight
- 429th
- of 714 Soyuz U flights
- Date and time
- 28 January 1986, 08:35 UTC
- Rocket
- Soyuz U
- Builder
- Progress RSC
- Launch site
- 1/5, Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Government/Top Secret
- International designator
- 1986-009
- Launches in 1986
- 9th of 110
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