Soyuz 20

Soyuz 20 (Russian: Союз 20, Union 20) was an unmanned spacecraft launched by the Soviet Union. It was a long-duration test of the Soyuz spacecraft that docked with the Salyut 4 space station. Soyuz 20 performed comprehensive checking of improved on-board systems of the spacecraft under various flight conditions. It also carried a biological payload. Living organisms were exposed to three months in space.

It was recovered on February 16, 1976.

Crew

None.

Mission parameters

Mass: 6,570 kg (14,480 lb)
Perigee: 177 km (110 mi)
Apogee: 251 km (156 mi)
Inclination: 51.6°
Period: 89.1 minutes

References

↑ "Baikonur LC1". Encyclopedia Astronautica. Retrieved 2009-03-04.

Soyuz programme

Main topics

Uncrewed
missions

Soyuz 7K-OK	Kosmos 133 Kosmos 140 Kosmos 186 Kosmos 188 Kosmos 212 Kosmos 213 Kosmos 238 Soyuz 2

Soyuz 7K-L1/L1S (Zond lunar programme)	Kosmos 146 Kosmos 154 Zond 1967A Zond 1967B Zond 4 Zond 1968A Zond 1968B Zond 5 Zond 6 Zond 1969A Zond-M 1 Zond-M 2 Zond 7 Zond 8 Zond 9 Zond 10

Soyuz 7K-T	Kosmos 496 Kosmos 573 Kosmos 613 Kosmos 656 Soyuz 32 (uncrewed landing) Soyuz 34 (uncrewed launch)

Soyuz 7K-TM	Kosmos 638 Kosmos 672

Soyuz 7K-S	Kosmos 670 Kosmos 772 Kosmos 869

Soyuz 7K-T/A9	Soyuz 20

Soyuz-T ("Soyuz 7K-ST")	Kosmos 1001 Kosmos 1074 Soyuz T-1

Soyuz-TM ("Soyuz 7K-STM")	Soyuz TM-1

Crewed
missions

Past

Soyuz 7K-OK (1967–1970)	1 3 4 5 6 7 8 9

Soyuz 7K-OKS (1971)	10 11

Soyuz 7K-T (1973–1981)	12 13 14 15 17 18a 18 21 23 24 25 26 27 28 29 30 31 32 (crewed launch) 33 34 (crewed landing) 35 36 37 38 39 40

Soyuz 7K-TM (1974–1976)	16 19 22

Soyuz-T (1976–1986)	T-2 T-3 T-4 T-5 T-6 T-7 T-8 T-9 T-10-1 T-10 T-11 T-12 T-13 T-14 T-15

Soyuz-TM (1986–2003)	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 (2003–2012)	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 (2010–2015)	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

Current

Soyuz-TMA-M (2015)	TMA-18M TMA-19M

Planned

Soyuz-TMA-M (2015–2016)	TMA-20M

Soyuz-MS (2016– )	MS-01 MS-02 MS-03 MS-04 MS-05

← 1974 · Orbital launches in 1975 · 1976 →

Soyuz 17 \| Kosmos 702 \| Kosmos 703 \| Landsat 2 \| Kosmos 704 \| Kosmos 705 \| Kosmos 706 \| Kosmos 707 \| Molniya-2-12 \| Starlette \| SMS-2 \| Kosmos 708 \| Kosmos 709 \| Intelsat IV F-6 \| Taiyo \| Kosmos 710 \| Kosmos 711 · Kosmos 712 · Kosmos 713 · Kosmos 714 · Kosmos 715 · Kosmos 716 · Kosmos 717 · Kosmos 718 \| OPS 2439 \| Kosmos 719 \| Kosmos 720 \| Kosmos 721 · Nauka-5KSA No.4 \| Kosmos 722 \| Interkosmos 13 \| Meteor-M No.31 \| Kosmos 723 \| Soyuz 7K-T No.39 \| Kosmos 724 \| Kosmos 725 \| GEOS-3 \| Kosmos 726 \| RM-20 \| Molniya-3 No.12 \| Kosmos 727 \| Kosmos 728 \| OPS 4883 \| Aryabhata \| Kosmos 729 \| Kosmos 730 \| Molniya-1-29 \| Explorer 53 \| Anik A3 \| Polluz · Castor \| OPS 9435 · OPS 9436 \| Kosmos 731 · Nauka-9KS No.2 \| Intelsat IV F-1 \| OPS 6226 \| Soyuz 18 \| Kosmos 732 · Kosmos 733 · Kosmos 734 · Kosmos 735 · Kosmos 736 · Kosmos 737 · Kosmos 738 · Kosmos 739 \| Kosmos 740 \| Kosmos 741 \| DS-U3-IK No.5 \| Kosmos 742 \| Molniya-1 No.24 · SRET-2 \| Venera 9 \| OPS 6381 · P-226-1 \| Nimbus 6 \| Kosmos 743 \| Venera 10 \| OPS 4966 \| Kosmos 744 \| OSO-8 \| Kosmos 745 \| Kosmos 746 \| Kosmos 747 \| Kosmos 748 \| Kosmos 749 \| Molniya-2-13 \| Meteor-2 No.1 \| Soyuz 19 \| Apollo · DM-2 \| Kosmos 750 \| Kosmos 751 \| Kosmos 752 \| Ji Shu Shiyan Weixing 1 \| Kosmos 753 \| Cos-B \| Kosmos 754 \| Kosmos 755 \| Viking 1 \| Kosmos 756 \| Symphonie 2 \| Kosmos 757 \| Molniya-1-31 \| Kosmos 758 \| Molniya-2-14 \| Kiku 1 \| Viking 2 \| Kosmos 759 \| Kosmos 760 \| Kosmos 761 · Kosmos 762 · Kosmos 763 · Kosmos 764 · Kosmos 765 · Kosmos 766 · Kosmos 767 · Kosmos 768 \| Meteor-M No.28 \| Kosmos 769 \| Kosmos 770 \| Kosmos 771 \| Intelsat IVA F-1 \| Aura \| Kosmos 772 \| Kosmos 773 \| Kosmos 774 \| Explorer 54 \| Kosmos 775 \| OPS 5499 \| Triad 2 \| E-8-5M No.412 \| GOES 1 \| Kosmos 776 \| Kosmos 777 \| Kosmos 778 \| Kosmos 779 \| Molniya-3 No.13 \| Soyuz 20 \| Explorer 55 \| Kosmos 780 \| Kosmos 781 \| Kosmos 782 \| Fanhui Shi Weixing 2 \| Kosmos 783 \| Kosmos 784 \| OPS 4428 · OPS 5547 \| DAD-A · DAD-B \| Interkosmos 14 \| Kosmos 785 \| Satcom 1 \| OPS 3165 \| Ji Shu Shiyan Weixing 2 \| Kosmos 786 \| Molniya-2-15 \| Unnamed \| Prognoz 4 \| Gran' No.11L \| Meteor No.38 \| Molniya-3 No.15

Payloads are separated by bullets ( · ), launches by pipes ( \| ). Manned flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).

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