Soyuz 18

Soyuz 18
Mission type	Docking with Salyut 4
Operator	Soviet space program
COSPAR ID	1975-044A
SATCAT no.	07818
Mission duration	62 days 23 hours 20 minutes 8 seconds
Orbits completed	993
Spacecraft properties
Spacecraft	Soyuz 7K-T No.7
Spacecraft type	Soyuz 7K-T
Manufacturer	NPO Energia
Launch mass	6570 kg
Landing mass	1200 kg
Crew
Crew size	2
Members	Pyotr Klimuk; Vitaly Sevastyanov
Callsign	Кавказ (Kavkaz - "Caucasus")
Start of mission
Launch date	24 May 1975, 14:58:10 UTC
Rocket	Soyuz-U
Launch site	Baikonur, Site 1/5
End of mission
Landing date	26 July 1975, 14:18:18 UTC
Landing site	56 km at the east of Arkalyk, Kazakhstan; 51°N 68°E / 51°N 68°E
Orbital parameters
Reference system	Geocentric orbit
Regime	Low Earth orbit
Perigee altitude	193.0 km
Apogee altitude	247.0 km
Inclination	51.6°
Period	88.6 minutes
Docking with Salyut 4
Docking date	26 May 1975
Undocking date	26 July 1975
Time docked	61 days
	; Vimpel Diamond patch Soyuz programme ← Soyuz 7K-T No.39 Soyuz 19 →

Soyuz 18 (Russian: Союз 18, Union 18) was a 1975 Soviet crewed mission to Salyut 4, the second and final crew to man the space station. Pyotr Klimuk and Vitaly Sevastyanov set a new Soviet space endurance record of 63 days and the mark for most people in space simultaneously (seven) was tied during the mission.

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