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Soviet Space ProgramSoyuz U1/5, Baikonur Cosmodrome, Republic of Kazakhstan
Yantar-4KS1 4
Launched
February 7, 1986
Summary
Yantar-4KS1 4 launched on a Soviet Space Program Soyuz U from 1/5, Baikonur Cosmodrome, Republic of Kazakhstan on February 7, 1986. It was Soviet Space Program's 1,967th launch, 11th this year and humanity's 3,043rd orbital launch attempt. It was the 431st Soyuz U flight and the 5th this year. The payload was bound for low Earth orbit (LEO). Kosmos-1731, one of 2 catalogued objects, reached a 191 × 265 km orbit inclined 64.8°. 2 objects from this launch are catalogued, one of them a payload.
- Watch
- No webcast on record.
- Vehicle
- Soyuz U · Soviet Space Program
- Booster
- No booster details on record.
- Mission
- Government/Top Secret · Low Earth Orbit (LEO)
- Milestone
- 431st Soyuz U flight · 5th this yearSoviet Space Program's 1,967th launch11th this yearhumanity's 3,043rd orbital launch attempt14th orbital launch attempt this year
Flight preview
Orbit: as tracked
Kosmos-1731 · NORAD 16589 · 1986-013 · Space-Track · tracking 1 of 2 objects
Show the numbers for orbit elements
- Object
- COSMOS 1731
- Object ID
- 1986-013A
- Epoch
- 1986-02-07 08:37:08 UTC
- Mean motion
- 16.19579478 rev/day
- Eccentricity
- 0.0056554
- Inclination
- 64.7908°
- Ascending node
- 304.0362°
- Arg. of perigee
- 68.4689°
- Mean anomaly
- 292.2501°
- Element set
- 999
- Rev at epoch
- 0
- B*
- 0
Perigee, apogee and period are Kepler figures from the catalogued mean elements, not a propagated state. Published orbit: LEO. Ascent drawn from padside's representative profile.
Catalogued objects
2 catalogued: 1 payload, 1 rocket stage; none still in orbit
- Kosmos-1731 · NORAD 16589 · deorbited October 3, 1986
Soyuz-U 11-208 Blok-I · re-entered February 9, 1986
Data from J. McDowell, planet4589.org
About this launch
First generation electro-optical reconnaissance satellite
Pad
1/5, Baikonur Cosmodrome, Republic of Kazakhstan
222nd launch from 1/5, 2nd this year · 766th from Baikonur Cosmodrome, Republic of Kazakhstan
487 launches from this pad · 1,565 from Baikonur Cosmodrome, Republic of Kazakhstan
10 days after the previous launch from this pad
All launches from Baikonur Cosmodrome, Republic of KazakhstanOpen in maps
Questions
When did Yantar-4KS1 4 launch?
Yantar-4KS1 4 launched on February 7, 1986. The time is known to the hour, not the minute.
Where can I watch Yantar-4KS1 4?
No webcast is on record for this launch.
What rocket launched Yantar-4KS1 4?
Soyuz U, flown by Soviet Space Program. Soyuz U spec sheet
Where did Yantar-4KS1 4 launch from?
1/5, Baikonur Cosmodrome, Republic of Kazakhstan.
What orbit did Yantar-4KS1 4 reach?
Kosmos-1731, one of 2 catalogued objects, reached a 191 × 265 km orbit inclined 64.8°.
How many satellites did Yantar-4KS1 4 launch?
1 payload from this launch is catalogued, no longer in orbit (Data from J. McDowell, planet4589.org).