SOVIET SPACE PROGRAM
Soyuz U | Yantar-4KS1 12
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Mar 23, 1989 at 12:25 UTC
▸ Flight profile›
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PAD1/5
SITEBaikonur Cosmodrome, Republic of Kazakhstan →ORBITLow Earth Orbit
TYPEGovernment/Top Secret
MISSION OVERVIEW
First generation electro-optical reconnaissance satellite
LAUNCH DETAILS
VEHICLE
Soyuz UAGENCY
Soviet Space ProgramMISSION
Yantar-4KS1 12
MISSION TYPE
Government/Top Secret
TARGET ORBIT
Low Earth Orbit
LAUNCH PAD
1/5LAUNCH SITE
Baikonur Cosmodrome, Republic of KazakhstanCOUNTRY
RUS
LAUNCH TIME VERIFICATION
CONFIRMEDPrecision: Minute
LAUNCH LIBRARY 2 PRIMARY
API ID: a0766a21-2f2d-4d3f-81c6-49a5f8a06dde
Reported date: Mar 23, 1989 at 12:25 UTC
Last synced: 2 minutes ago
This launch date and time are confirmed by the launch provider. Countdown is active.
LAUNCH MAP
PAD WEATHER
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VEHICLE — Soyuz U →
MANUFACTURER
Russian Federal Space Agency (ROSCOSMOS)
FLIGHTS
714
SUCCESSES
694
SUCCESS RATE
97.2%
FREQUENTLY ASKED QUESTIONS
When is the Soyuz U | Yantar-4KS1 12 launch?
The Soyuz U | Yantar-4KS1 12 is scheduled for Thursday, March 23, 1989 at 12:25 PM UTC. This is the NET (No Earlier Than) time and may be subject to change. Current status: SUCCESS.
What rocket is being used for Yantar-4KS1 12?
The Soyuz U | Yantar-4KS1 12 mission uses the Soyuz U rocket, manufactured by Russian Federal Space Agency (ROSCOSMOS). The Soyuz U has flown 714 times with a 97.2% success rate.
Where is the Soyuz U | Yantar-4KS1 12 launching from?
The launch takes place from 1/5 at Baikonur Cosmodrome, Republic of Kazakhstan.
What orbit is Yantar-4KS1 12 going to?
The Yantar-4KS1 12 mission is targeting Low Earth Orbit.
Who is launching Yantar-4KS1 12?
The Soyuz U | Yantar-4KS1 12 is operated by Soviet Space Program.
Can I watch the Soyuz U | Yantar-4KS1 12 launch live?
Yes. Visit the launch detail page on Space Launch Live for embedded YouTube webcasts, replay videos, and links to live coverage from SpaceX, NASA, NASASpaceflight, and other channels.
LAUNCH TIMELINE
Mar 29, 2026 05:34 UTC
Launch added to tracker
Imported from Launch Library 2 API
Mar 29, 2026 05:34 UTC
Launch date set: Mar 23, 1989 at 12:25 UTC
NET (No Earlier Than) confirmed by Soviet Space Program
Mar 29, 2026 05:34 UTC
Launch completed successfully
Updated via Launch Library 2
LIVE DATA SOURCES
Last data sync: 2 minutes ago
●Launch Library 22 minutes ago
Launch ID: a0766a21-2f2d-4d3f-81c6-49a5f8a06dde
●Open-Meteo Weather2 days ago
Pad weather at 45.92, 63.34
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Mission Profile
Yantar-4KS1 12 was a Soyuz U mission operated by Soviet Space Program that lifted off from 1/5, Baikonur Cosmodrome, Republic of Kazakhstan on March 23, 1989. The flight carried its payload on a government/top secret mission to Low Earth Orbit. The launch was a success.