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Kosmos 638

Soyuz 7K-TM
Mission type	Orbital test flight
Operator	Soviet space program
COSPAR ID	1974-018A
SATCAT no.	7234
Mission duration	9 days, 21 hours and 35 minutes
Spacecraft properties
Spacecraft	Soyuz 7K-TM s/n 71
Manufacturer	NPO Energia
Launch mass	6,570 kg (14,480 lb)
Start of mission
Launch date	3 April 1974, 07:30 (1974-04-03UTC07:30Z) GMT
Rocket	Soyuz-U
Launch site	Baikonur 31/6
End of mission
Disposal	Deorbited
Landing date	13 April 1974, 05:05 (1974-04-13UTC05:06Z) GMT
Orbital parameters
Reference system	Geocentric
Perigee altitude	187 km (116 mi)
Apogee altitude	309 km (192 mi)
Inclination	51.8°
Period	89.4 min
Soyuz programme← Soyuz 13Kosmos 656 → Kosmos (satellites)← Kosmos 637Kosmos 639 →

Kosmos 638 (Russian: Космос 638) was an uncrewed test of the 1975 Apollo–Soyuz Test Project Soyuz. It carried an APAS-75 androgynous docking system.

This was followed by another uncrewed test of this spacecraft type, Kosmos 672. It was a Soyuz 7K-TM spacecraft.

When the air was released from the orbital module (which is ejected before re-entry of the capsule) it caused unexpected motions with the spacecraft. This led to the next test also being uncrewed.

Mission parameters

• Spacecraft: Soyuz-7K-TM №71
• Mass: 6510 to 6680 kg
• Crew: None
• Launched: April 3, 1974
• Landed: April 13, 1974

See also

• Kosmos 672
• Soyuz 16

References

1. ^ David S. F. Portree (1995). Mir Hardware Heritage (PDF). NASA. NASA-SP-4225. Archived (PDF) from the original on 26 March 2023.
2. ^ Rex Hall; David Shayler (2003). Soyuz: A Universal Spacecraft. Springer Science & Business Media. p. 211. ISBN 978-1-85233-657-8.

v t e Soyuz programme
List of Soyuz missions List of Soviet human spaceflight missions List of Russian human spaceflight missions
Main topics	Soyuz (rocket family) Soyuz (spacecraft) Baikonur Cosmodrome Site 1/5 Site 31/6 Soyuz abort modes Cosmonaut ranks and positions
Past missions (by spacecraft type)	Soyuz 7K-OK (1966–1970) Kosmos 133† Soyuz 7K-OK No.1† (uncrewed) Kosmos 140 Soyuz 1† Kosmos 186 188 212 213 238 Soyuz 2 (uncrewed) 3 4 5 6 7 8 9 Soyuz 7K-L1 (1967–1970) (Zond lunar programme) Kosmos 146 154† Zond 1967A† 1967B† Zond 4 1968A† 1968B† 5 6 1969A† Zond-M 1† M 2† Zond 7 8 9 10 Soyuz 7K-L1E (1969–1970) Soyuz 7K-L1E No.1† Kosmos 382 Soyuz 7K-LOK (1971–1972) Soyuz 7K-LOK No.1† No.2† Soyuz 7K-OKS (1971) Soyuz 10† 11† Soyuz 7K-T (1972–1981) Kosmos 496 573 Soyuz 12 Kosmos 613 Soyuz 13 Kosmos 656 Soyuz 14 15† 17 18a† 18 20 (uncrewed) 21 23† 24 25† 26 27 28 29 30 31 32 (uncrewed landing) 33† 34 (uncrewed launch) 35 36 37 38 39 40 Soyuz 7K-TM (1974–1976) Kosmos 638 672 Soyuz 16 19 (Apollo–Soyuz) 22 Soyuz 7K-S (1974–1976) Kosmos 670 772† 869† Soyuz-T (1978–1986) Kosmos 1001† 1074 Soyuz T-1 (uncrewed) T-2 T-3 T-4 T-5 T-6 T-7 T-8† T-9 T-10a† T-10 T-11 T-12 T-13 T-14 T-15 Soyuz-TM (1986–2002) Soyuz TM-1 (uncrewed) TM-2 TM-3 TM-4 TM-5 TM-6 TM-7 TM-8 TM-9 TM-10 TM-11 TM-12 TM-13 TM-14 TM-15 TM-16 TM-17 TM-18 TM-19 TM-20 TM-21 TM-22 TM-23 TM-24 TM-25 TM-26 TM-27 TM-28 TM-29 TM-30 TM-31 TM-32 TM-33 TM-34 Soyuz-TMA (2002–2012) Soyuz TMA-1 TMA-2 TMA-3 TMA-4 TMA-5 TMA-6 TMA-7 TMA-8 TMA-9 TMA-10 TMA-11 TMA-12 TMA-13 TMA-14 TMA-15 TMA-16 TMA-17 TMA-18 TMA-19 TMA-20 TMA-21 TMA-22 Soyuz-TMA-M (2010–2016) Soyuz TMA-01M TMA-02M TMA-03M TMA-04M TMA-05M TMA-06M TMA-07M TMA-08M TMA-09M TMA-10M TMA-11M TMA-12M TMA-13M TMA-14M TMA-15M TMA-16M TMA-17M TMA-18M TMA-19M TMA-20M Soyuz MS (2016–present) Soyuz MS-01 MS-02 MS-03 MS-04 MS-05 MS-06 MS-07 MS-08 MS-09 MS-10† MS-11 MS-12 MS-13 MS-14 (uncrewed) MS-15 MS-16 MS-17 MS-18 MS-19 MS-20 MS-21 MS-22 (uncrewed landing) MS-23 (uncrewed launch) MS-24 MS-25
Current missions	MS-26
Future missions	2025 MS-27 MS-28 2026 MS-29
Uncrewed missions are designated as Kosmos instead of Soyuz; exceptions are noted "(uncrewed)". The † sign designates failed missions. Italics designates cancelled missions.

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