1975 in spaceflight

1975 in spaceflight
Orbital launches
Artist's impression of the ASTP docking
First	10 January
Last	27 December
Total	132
Catalogued	125
National firsts
Satellite	India
Rockets
Maiden flights	Atlas SLV-3D Centaur-D1AR Delta 3000 Diamant-BP4 Long March 2C N-I Scout F-1 Titan III(34)B
Retirements	Atlas SLV-3D Centaur-D1A Delta 1000 Diamant-BP4 Saturn IB Scout F-1
Manned flights
Orbital	4
Suborbital	1
Total travellers	9

In 1975 several notable events happened in spaceflight such as the launch to Mars of the Viking orbiter/landers missions, the joint Apollo–Soyuz Test Project, and the Venera 9 Venus mission.

Viking 1 was launched on 20 August 1975 and Viking 2 was launched 9 September 1975. This orbiter/lander mission was to photograph Mars in detail and to find water and life on the surface.
The Apollo-Soyuz saw an end to the space race with the USA and USSR. The mission was launched between 15 July 1975 and 17 July 1975.
The Venera 9 mission was launched 8 June 1975 was another successful orbiter/lander mission.

Launches

Date and time (UTC)	Rocket		Launch site		LSP
	Payload	Operator	Orbit	Function	Decay (UTC)	Outcome
	Remarks
10 January 21:43:37	Soyuz		Baikonur Site 1/5
	Soyuz 17		Low Earth (Salyut 4)	Salyut expedition	19 February 11:03	Successful
	Manned flight with two cosmonauts, first mission to Salyut 4
5 April 11:04:54	Soyuz		Baikonur Site 1/5
	Soyuz 7K-T #39		Intended: Low Earth (Salyut 4)	Salyut expedition	11:26	Launch failure
	Manned flight with two cosmonauts, first and second core stages failed to separate, flight aborted and crew returned on suborbital trajectory
9 April 23:58:02	Delta 1410		Vandenberg SLC-2W		NASA
9 April 23:58:02	GEOS-3	NASA	Low Earth	Geodesy	In orbit	Successful
19 April	Kosmos-3M		Kapustin Yar		Soviet Interkosmos programme
	Aryabhata	ISRO	Low Earth	X-ray astronomy, aeronomics, and solar physics studies	11 February 1992	Launch success, payload partial failure
	First Indian satellite; payload failed 4-5 days after launch
24 May 14:58:10	Soyuz		Baikonur Site 1/5
	Soyuz 18		Low Earth (Salyut 4)	Salyut expedition	26 July 14:18	Successful
	Manned flight with two cosmonauts, final mission to Salyut 4
15 July 14:58:10	Soyuz-U		Baikonur Site 1/5
	Soyuz 19		Low Earth (Apollo)	International docking	21 July 10:50	Successful
	Manned flight with two cosmonauts, Soviet contribution to the Apollo Soyuz Test Project
15 July 19:50:01	Saturn IB		Kennedy LC-39B		NASA
	Apollo	NASA	Low Earth (Soyuz 19)	International docking	24 July 21:18	Successful
	DM-2	NASA	Low Earth (Apollo)	Docking adaptor	2 August	Successful
	Manned flight with three astronauts, American contribution to the Apollo Soyuz Test Project, final flight of the Apollo programme and the Saturn rocket
20 August 21:22:00	Titan IIIE		Cape Canaveral LC-41
	Viking 1 Orbiter	NASA	Areocentric	Mars orbiter	In orbit	Successful
	Viking 1 Lander	NASA	Areocentric	Mars lander	20 July 1976 11:53:06	Successful
	Lander landed in Chryse Planitia, becoming the first US spacecraft to land on Mars. It operated until 11 November 1982 when communications were lost due to an erroneous command being sent to the spacecraft. Orbiter was deactivated on 17 August 1980.
9 September 18:39:00	Titan IIIE		Cape Canaveral LC-41
	Viking 2 Orbiter	NASA	Areocentric	Mars orbiter	In orbit	Successful
	Viking 2 Lander	NASA	Areocentric	Mars lander	3 September 1976 22:58:20	Successful
	Lander landed in Utopia Planitia and operated until its batteries failed on 11 April 1980. Orbiter was deactivated on 25 July 1978.

Deep space rendezvous

Date	Spacecraft	Event	Remarks
16 March	Mariner 10	3rd flyby of Mercury	Closest approach: 327 kilometres (203 mi)
20 October	Venera 9	Cytherocentric orbit insertion	First orbiter of Venus
22 October	Venera 9 lander	Venerian landing	Landed at 05:13 UTC; ; first images from Venus surface
23 October	Venera 10	Cytherocentric orbit insertion
25 October	Venera 10 lander	Venerian landing	Landed at 05:17 UTC

References

Krebs, Gunter. "Chronology of Space Launches".
Kyle, Ed. "Space Launch Report".
McDowell, Jonathan. "Jonathan's Space Report".
Pietrobon, Steven. "Steven Pietrobon's Space Archive".
Wade, Mark. "Encyclopedia Astronautica".
Webb, Brian. "Southwest Space Archive".
"NASASpaceFlight.com".
"Spaceflight Now".
"Space Information Center". JAXA.
"Space Calendar". NASA JPL.
"ISS Calendar". Spaceflight 101.
"Launch Forecast". Space.com.
Clark, Stephen. "Launch Schedule". Spaceflight Now.
"U.S. Space Objects Registry".
"Хроника освоения космоса" [Chronicle of space exploration]. Cosmoworld.ru (in Russian).

Generic references:

Footnotes

Timeline of spaceflight
1940s					1944	1945	1946	1947	1948	1949
1950s	1950	1951	1952	1953	1954	1955	1956	1957	1958	1959
1960s	1960	1961	1962	1963	1964	1965	1966	1967	1968	1969
1970s	1970	1971	1972	1973	1974	1975	1976	1977	1978	1979
1980s	1980	1981	1982	1983	1984	1985	1986	1987	1988	1989
1990s	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999
2000s	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009
2010s	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019

← 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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