Apollo-Soyuz test project

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Apollo-Soyuz test project

(ASTP) The first international manned space flight, finally agreed to in 1972 and achieved by the USA and the USSR in 1975. An American Apollo spacecraft – Apollo 18 – and a Soviet Soyuz craft – Soyuz 19 – were launched into Earth orbit on July 15, rendezvoused on July 17 at an altitude of 225 km, and successfully docked. The crews visited each other's craft and conducted joint experiments and surveys. The mission involved major design modifications in both spacecraft.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Apollo-Soyuz Test Project


(ASTP), a joint experimental flight of an American Apollo spacecraft and a Soviet Soyuz spacecraft. The program of the ASTP was confirmed by a Soviet-American agreement on cooperation in the exploration and use of space for peaceful purposes, which was signed on May 24, 1972.

The main objectives of the ASTP were as follows: to test the components of a compatible rendezvous system in orbit; to test two-way, or active-passive, docking mechanisms (seeDOCKING); to test the methods and equipment for the transfer of astronauts from one spacecraft to another; and to acquire experience in conducting joint US-Soviet space flights, including, if necessary, rendering assistance in emergencies. In addition, the aims of the ASTP included a study of the possibility of controlling the attitude of docked spacecraft, a study of communications between spacecraft, and the coordination of the operations of the American and Soviet flight control centers. During preparations for the flight, Soviet and American designers solved a set of complex problems to ensure the compatibility of, for example, the spacecraft search and rendezvous systems, docking mechanisms, life support systems, communications gear, and flight controls equipment.

At 3:20 P.M. (Moscow time) on July 15, 1975, the Soyuz 19 spacecraft, with cosmonauts A. A. Leonov and V. N. Kubasov aboard, was launched from the Baikonur Cosmodrome. At 10:50 P.M., an Apollo spacecraft, with astronauts T. Stafford, D. Slayton, and V. Brand aboard, was launched from the Kennedy Space Center at Cape Canaveral, Fla. The two spacecraft docked at 7:12 P.M. on July 17, in the 36th orbit of the Soyuz spacecraft. The spacecraft undocked on July 19, in the 64th Soyuz orbit, and docked again in the 66th orbit. The spacecraft undocked for the last time in the 68th orbit of Soyuz 19 and then proceeded on separate orbits. The total flight duration was five days 22 hr 31 min for Soyuz 19 and nine days 1 hr 28 min for the Apollo spacecraft. The total flight duration while the two spacecraft were docked was 46 hr 36 min.

In the joint flight, several scientific studies and technical experiments were carried out. In an artificial solar eclipse, the Soyuz crew studied the solar corona and the gases around the two spacecraft during an occultation of the sun by the Apollo spacecraft. In an ultraviolet absorption experiment, the concentrations of atomic oxygen and nitrogen in space were measured at the flight altitude. In an experiment with zone-forming fungi, the effects of the aggregate of space-flight factors—that is, of weightlessness, physiological acceleration, and space radiation—on basic biological rhythms were investigated. In a microbial exchange experiment, the exchange of microorganisms between individual crew members and between the crews of the two spacecraft was studied under space-flight conditions. In a test of a general-purpose furnace, the effect of weightlessness on certain metallurgical and crystal-chemical processes in metallic and semiconductor materials was investigated.

The Apollo-Soyuz Test Project was an important step in the development of international cooperation in the exploration and use of space for peaceful purposes.


Soiuz i Apollon. Moscow, 1976.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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(NASA also used some of this gear for the Apollo-Soyuz Test Project, a historic 1975 joint space mission with the Soviet Union.)
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Projects Apollo and the Apollo-Soyuz Test Project (ASTP) required many complex agreements throughout the world.
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Among the items to be auctioned are a Soviet spacesuit worn by the Soviet pilot Alexei Lenov on the Apollo-Soyuz Test Project in July 1975, a joint U.S.
This is probably because some analysts include the first studies for Apollo, Skylab, and the use of Apollo spacecraft in the Apollo-Soyuz Test Project. The Orloff analysis includes the first studies of Apollo, but not Skylab (1973-74) or Soyuz (1975) activities.
It was not until more than a decade later, during the Apollo-Soyuz Test Project, that American astronauts and Soviet cosmonauts would fly in space together.
To long-time space watchers, this collaboration brings back memories of the joint Apollo-Soyuz Test Project of July 1975.
She cites the manned Apollo-Soyuz Test Project mission (ASTP), conducted in 1975, as one that took place in an era that also saw "the beginning of the Soviets' second phase of testing of their ASAT weapons, the development of Soviet RORSATs (nuclear reactor-powered ocean reconnaissance satellites) and a great deal of importance placed on military space systems in both countries." In short, she says, "in purely political terms, the ASTP was soon followed by a sharp deterioration in U.S.-Soviet relations overall."
Ultimately, coverage of Zond, Soyuz, and Salyut lays a substantial foundation for appreciating the last Apollo flight--the Apollo-Soyuz Test Project.
The 1970s followed with the F-14 Tomcat and the Apollo-Soyuz Test Project. In the 1980s, the Space Shuttle was developed, and the Voyager circled the world non-stop without refueling.