Kosmos 140 Explained

Kosmos 140
Mission Type:Test flight
Operator:Experimental Design Bureau (OKB-1)
Cospar Id:1967-009A
Satcat:02667
Mission Duration:2 days
Spacecraft:Soyuz 7K-OK No.3
Spacecraft Type:Soyuz 7K-OK
Manufacturer:Experimental Design Bureau (OKB-1)
Launch Mass:6450 kg
Landing Mass:2500 kg
Dimensions: long
wide
Launch Date:7 February 1967, 03:21 GMT
Launch Rocket:Soyuz 11A511 s/n U15000-03
Launch Site:Baikonur, Site 1/5
Launch Contractor:Experimental Design Bureau (OKB-1)
Landing Date:9 February 1967
Landing Site:Aral Sea, Kazakhstan
Orbit Reference:Geocentric orbit
Orbit Regime:Low Earth orbit
Orbit Periapsis:165.0 km
Orbit Apoapsis:218.0 km
Orbit Inclination:51.7°
Orbit Period:88.5 minutes
Apsis:gee
Programme:Soyuz programme
Previous Mission:Soyuz 7K-OK No.1
Next Mission:Soyuz 1

Kosmos 140 (Russian: Космос 140 meaning Cosmos 140), Soyuz 7K-OK No.3, was an uncrewed flight of the Soyuz spacecraft.[1] It was the third attempted test flight of the Soyuz 7K-OK model, after orbital (Kosmos 133) and launch (Soyuz 11A511) failures of the first two Soyuz spacecraft.

History

The follow-up to Kosmos 133 (Soyuz 7K-OK No.2), 28 November 1966, was planned for 14 December 1966 (Soyuz 7K-OK No.1) but ended disastrously. At liftoff, the Blok A core stage of the 11A57 booster ignited, but not the strap-ons. A shutdown command was immediately sent and pad crews began to move the service towers back in place and drain the propellants. This task was completed for the core stage and strap-ons, and then about 27 minutes after the attempted launch, the launch escape system (LES) suddenly fired. Its exhaust caused the Blok I third stage propellant tanks to overheat and explode, killing one person on the ground and damaging the Soyuz and core stage/strap-ons beyond repair. LC-31 was also badly damaged and took seven months of repair work in the frigid Kazakhstan winter to be restored to use. The reason for the LES firing was thought to be either a timer being activated due to the Earth's rotation affecting the gyroscope package in the launch vehicle or perhaps one of the service towers bumping it.

Launch

In February 1967, the backup booster and spacecraft were set up at LC-1 and the planned mission could be carried out. Kosmos 140 was operated in a low Earth orbit, on 7 February 1967, it had a perigee of, an apogee of, an inclination of 51.7°, and an orbital period of 88.5 minutes.[2]

Return

The spacecraft suffered attitude control problems and excessive fuel consumption in orbit, but remained controllable. An attempted maneuver on the 22nd orbit still showed problems with the control system. It malfunctioned yet again during retrofire, leading to a steeper than planned ballistic reentry and a hole being burned in the heat shield.[3]

Although the event would have been lethal to any human occupants, the capsule's recovery systems operated and the capsule crashed through the ice of the frozen Aral Sea, hundreds of kilometers short of its landing zone. The spacecraft finally sank in 10 metres of water and had to be retrieved by divers. The test performance was nonetheless deemed "good enough"; the crewed docking missions of Soyuz 1 and Soyuz 2 was approved for the next flight.

Notes and References

  1. Web site: Soyuz spacecraft flights. S.P.Korolev RSC Energia. 16 April 2009. 5 October 2013. https://web.archive.org/web/20131005022129/http://www.energia.ru/english/energia/history/flights_soyuz.html. dead.
  2. Web site: Cosmos 140: Trajectory 1967-009A. nssdc.gsfc.nasa.gov. NASA. 27 February 2020. 2 April 2020.
  3. Web site: Cosmos 140: Display 1966-109A. nssdc.gsfc.nasa.gov. NASA. 27 February 2020. 2 April 2020.