Soyuz 10

This article is about a 1971 spaceflight. For the mission identified by NASA as ISS Soyuz 10, see Soyuz TMA-6.

Soyuz 10

Salyut 1 (left) and Soyuz 10 during a docking attempt.
Operator	Soviet space program
COSPAR ID	1971-034A
SATCAT no.	5172
Mission duration	1 day, 23 hours, 45 minutes, 54 seconds
Orbits completed	32
Spacecraft properties
Spacecraft type	Soyuz 7K-OKS
Manufacturer	Experimental Design Bureau OKB-1
Launch mass	6,800 kilograms (15,000 lb)
Crew
Crew size	3
Members	Vladimir Shatalov Aleksei Yeliseyev Nikolai Rukavishnikov
Callsign	Гранит ([Granit] Error: {{Lang}}: text has italic markup (help) - "Granite")
Start of mission
Launch date	22 April 1971, 23:54:06 (1971-04-22UTC23:54:06Z) UTC
Rocket	Soyuz
Launch site	Baikonur 1/5
End of mission
Landing date	24 April 1971, 23:40:00 (1971-04-24UTC23:41Z) UTC
Landing site	120 kilometres (75 mi) NW of Karaganda
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Perigee altitude	209 kilometres (130 mi)
Apogee altitude	258 kilometres (160 mi)
Inclination	51.6 degrees
Period	89.1 minutes
Epoch	23 April 1971
Soyuz programme (Manned missions)

Soyuz 10 (Russian: Союз 10, Union 10) was launched on 22 April 1971 as the world's first mission to the world's first space station, the Soviet Salyut 1. The docking was not successful and the crew returned to Earth without having entered the station. It would be the first of numerous docking failures in the Soviet space station program.

Orbit

Soyuz 10 was launched on 22 April 1971 to dock with Salyut 1. The spacecraft was the first of the upgraded Soyuz 7K-OKS, featuring the new "probe and drogue" docking mechanism with internal crew transfer capability, intended for space station visits.

Mission

The cosmonauts Vladimir Shatalov, Aleksei Yeliseyev, and Nikolai Rukavishnikov were able to navigate their Soyuz 10 spacecraft to the Salyut 1 station, yet during docking they ran into problems. The automatic control system failed during approach due to a serious design oversight - when soft dock was performed, the computer sensed an abnormality in the spacecraft's alignment and began firing the attitude control jets to compensate. With Soyuz 10 being pushed to one side by the attitude control system, it became impossible to achieve hard dock and large quantities of propellant were expended doing so. The docking attempt was called off, but further problems occurred when the probe would not come out of the space station's docking cone. The obvious solution was to simply jettison the orbital module and leave it attached to Salyut 1, but this would make it impossible for future Soyuz missions to dock and thus the space station would have to be abandoned. Eventually, ground controllers figured out that the cosmonauts could throw a circuit breaker in the docking mechanism, as interrupting the power supply would cause the probe to automatically retract. This procedure worked and undocking was completed. The automatic control system would be redesigned on future Soyuz spacecraft.

After finally undocking, one last hitch presented itself when toxic fumes began to fill the capsule during reentry, causing Rukavishnikov to pass out – all three crew members were recovered unscathed however.

Crew

Position	Cosmonaut
Commander	Vladimir Shatalov Third spaceflight
Flight Engineer	Aleksei Yeliseyev Third spaceflight
Test Engineer	Nikolai Rukavishnikov First spaceflight

Backup crew

Position	Cosmonaut
Commander	Alexey Leonov
Flight Engineer	Valeri Kubasov
Test Engineer	Pyotr Kolodin

Reserve crew

Position	Cosmonaut
Commander	Georgi Dobrovolski
Flight Engineer	Vladislav Volkov
Test Engineer	Viktor Patsayev

See also

• Soyuz T-13, a mission to manually dock to the crippled Salyut 7 space station.
• Soyuz T-15, a mission to ferry equipment from Salyut 7 to Mir, which had to manually maneuver and dock to Mir.