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Soyuz | Soyuz 18

Russian Federal Space Agency (ROSCOSMOS) | Russia
Baikonur Cosmodrome, Republic of Kazakhstan
May 24, 1975, 2:58 p.m.
Status: Launch Successful
Mission:

Soyuz 18 was the second and final crew to man the Salyut 4 space station. The mission began on May 24th 1975 at 1458:10 UTC, launching Commander Pyotr Klimuk & Flight Engineer Vitali Sevastyanov into orbit docking with Salyut 4 2 days later. They stayed on the station for 63 days setting a new Soviet space endurance record at the time. Klimuk & Sevastyanov were the back-up crew for the failed Soyuz 18a mission so their mission goals included completing the goals of Soyuz 18a, continuing the work of Soyuz 17 & fixing or replacing equipment. They replaced a gas analyzer, switched a pumping condenser in the water regeneration system with a hand pump & fixed a spectrometer. Mostly the experiments were biological & medical but they also studied stars, planets, earth and its atmosphere with roughly 2000 photographs of Earth and 600 of the sun taken. The mission concluded with a safe landing on June 26th 1975 at 1418:18 UTC.

Low Earth Orbit
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Thor Burner 2A | DMSP-5C F2

McDonnell Douglas | United States of America
Vandenberg SFB, CA, USA
May 24, 1975, 3:22 a.m.
Status: Launch Successful
Mission:

Military meteorological satellite

Sun-Synchronous Orbit
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Atlas SLV-3D Centaur | INTELSAT IV F1

Convair | United States of America
Cape Canaveral SFS, FL, USA
May 22, 1975, 10:04 p.m.
Status: Launch Successful
Mission:

Geostationary communications satellite developed by Hughes Aircraft Company

Geostationary Orbit
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Voskhod | Zenit-2M 57

Soviet Space Program | Russia
Baikonur Cosmodrome, Republic of Kazakhstan
May 21, 1975, 6:59 a.m.
Status: Launch Successful
Mission:

The soviet Zenit-2M (Gektor, 11F690) was an improved version of the Zenit-2 area surveillance reconnaissance satellite. It was part of the Vostok-based Zenit-family.

Low Earth Orbit
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Titan IIIC | DSCS-2 5 & 6

Lockheed Martin | United States of America
Cape Canaveral SFS, FL, USA
May 20, 1975, 2:03 p.m.
Status: Launch Successful
Mission:

Satellites designed to provide secure voice and data communications for the US military.

Geostationary Orbit
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Diamant BP4 | Castor & Pollux

Société d'étude et de réalisation d'engins balistiques | France
Guiana Space Centre, French Guiana
May 17, 1975, 10:32 a.m.
Status: Launch Successful
Mission:

Dual French scientific satellites

Low Earth Orbit
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Delta 2914 | Anik A3

McDonnell Douglas | United States of America
Cape Canaveral SFS, FL, USA
May 7, 1975, 11:35 p.m.
Status: Launch Successful
Mission:

Geosynchronous communications satellite developed by Hughes Aircraft Company.

Geosynchronous Orbit
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Scout F-1 | SAS 3

Vought | United States of America
Broglio Space Center, Kenya
May 7, 1975, 10:45 p.m.
Status: Launch Successful
Mission:

Astronomy research satellite

Low Earth Orbit
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Molniya-M | Molniya-1 29

Russian Space Forces | Russia
Plesetsk Cosmodrome, Russian Federation
April 29, 1975, 10:23 a.m.
Status: Launch Successful
Mission:

The Molniya were Soviet communication satellites operating from an inclined highly elliptical earth orbit of 500 km × 40000 km with 12 hour period for coverage of high northern latitudes.

Elliptical Orbit
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Voskhod | Zenit-4MK 41

Soviet Space Program | Russia
Plesetsk Cosmodrome, Russian Federation
April 24, 1975, 8:04 a.m.
Status: Launch Successful
Mission:

High resolution optical reconnaissance satellite of the Vostok-based Zenit family.

Low Earth Orbit
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