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Kosmos 1686

Fourth and final TKS spacecraft

Field	Value
station	Kosmos 1686
station_image	Salyut 7 & Cosmos 1686.gif
station_image_caption	Kosmos 1686 (top) docked to Salyut 7, imaged by Range-Doppler radar.
insignia	Salyut_program_insignia.svg
insignia_caption	Salyut program insignia
sign	Salyut 7
launch	1985-09-27
02:01:00 UTC
Docked to Salyut 7 on 1985-10-02.
launch_pad	Baikonur 200/39
reentry	February 7, 1991
mass	20,000 kg
perigee	219 km (118.25 nmi)
apogee	278 km (150.1 nmi)
inclination	51.6 degrees
period	89.2 minutes
length	15 m
width	16 m
diameter	4.15 m
orbits_day	16.14
in_orbit	1959 days
as_of	deorbit & reentry
stats_ref
configuration_image	Salyut 7 and Cosmos 1686 drawing.png
configuration_caption	Combined Kosmos 1686-Salyut 7 space station complex

02:01:00 UTC Docked to Salyut 7 on 1985-10-02.

Kosmos 1686 ( meaning Cosmos 1686), also known as TKS-4, was a heavily modified TKS spacecraft which docked unmanned to the Soviet space station Salyut 7 as part of tests to attach scientific expansion modules to stations in Earth orbit. The module which docked to the station was the FGB component of a TKS vehicle launched on September 27, 1985, and was designed to test systems planned for use on the Mir Core Module. The spacecraft docked with Salyut 7 on October 2, 1985, during the long-duration stay of the cosmonauts of its fifth principal expedition, which arrived on Soyuz T-14. It was the last flown TKS spacecraft.

Notable features

The spacecraft's VA capsule was greatly modified to carry instruments – the retrorocket and parachute packages were replaced by scientific equipment, including an infrared telescope and the Ozon spectrometer.
The combined Salyut 7-Kosmos 1686 complex massed 43 tons, with Kosmos 1686 delivering 4500 kg of cargo to Salyut 7 and nearly doubling the amount of habitable volume available to the station's crew.
On August 19–22, 1986, ground controllers boosted the vacant Salyut 7-Kosmos 1686 complex to a 474 km by 492 km orbit using engines on Kosmos 1686. This reduced the propellant supply of the complex to 70 kg (about 500 kg were required for controlled deorbit). In addition, Kosmos 1686 and Salyut 7 each suffered major systems breakdowns soon after they were abandoned, making the complex impossible to control.
All previous space stations over which the Soviets maintained control were intentionally deorbited after their last cosmonaut crew departed. The Soviets estimated that the reboost gave the complex an 8-yr lifetime in orbit. They considered recovering the station using the Buran shuttle. However, following delays to and the eventual cancellation of the Buran program, Kosmos 1686 underwent uncontrolled reentry with Salyut 7 on February 7, 1991, reentering over Argentina, scattering much of its debris over the town of Capitan Bermudez.

References

| access-date= 18 October 2009 }}

| archive-url= https://web.archive.org/web/20230326210404/https://www.hq.nasa.gov/pao/History/SP-4225/documentation/mhh/mirheritage.pdf | archive-date= 26 March 2023 | url-status= live }}

| access-date= 29 June 2007 }}

| access-date= 18 October 2009 }}

| access-date= 18 October 2009 | archive-url= https://web.archive.org/web/20120513052250/http://www.aero.org/capabilities/cords/faq8.html | archive-date= 13 May 2012 | url-status= dead }}

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