Encyclopedia Astronautica
Soyuz 19 (ASTP)



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Soyuz ASTP in Orbit
Credit: NASA
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Test of APAS Docking
Test of APAS Docking System
Credit: RKK Energia
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Soyuz 19 (ASTP)
Credit: www.spacefacts.de - www.spacefacts.de
Crew: Kubasov, Leonov. First docking between two spacecraft launched from different nations. Culmination of the Apollo-Soyuz Test Project, a post-moon race 'goodwill' flight to test a US/Soviet common docking system. Backup crew: Filipchenko, Rukavishnikov.Support crew: Andreyev, Dzhanibekov, Ivanchenkov, Romanenko.

Soyuz 19 initial orbital parameters were 220.8 by 185.07 kilometres, at the desired inclination of 51.80°, while the period of the first orbit was 88.6 minutes. On 17 July the two spacecraft docked. The crew members rotated between the two spacecraft and conducted various mainly ceremonial activities. Leonov was on the American side for 5 hours, 43 minutes, while Kubasov spent 4:57 in the command and docking modules.

After being docked for nearly 44 hours, Apollo and Soyuz parted for the first time and were station-keeping at a range of 50 meters. The Apollo crew placed its craft between Soyuz and the sun so that the diameter of the service module formed a disk which blocked out the sun. After this experiment Apollo moved towards Soyuz for the second docking.

Three hours later Apollo and Soyuz undocked for the second and final time. The spacecraft moved to a 40 m station-keeping distance so that an ultraviolet absorption experiment could be performed. With all the joint flight activities completed, the ships went on their separate ways. Soyuz 19 landed safely July 21, 1975 10:51 GMT, 87 km north-east of Arkalyk, 9. 6 km from its aim point.

From: The Partnership: A History of the Apollo-Soyuz Test Project, by Edward Clinton Ezell and Linda Neuman Ezell, NASA History Series SP-4209, 1978.

15 July 1975 - Launch

At Baykonur the weather was perfect for the launch: clear skies, light winds, and hot July sunshine. With the crew on board and 45 minutes remaining until lift-off, the ground team removed the semicircular halves of the service structure. Soyuz 19 sat poised for the launch. In Houston, Ross Lavroff interpreted the commentary as it was broadcast from MCC-M in Kaliningrad:

This is the Soviet Mission Control Centre. Moscow time is 15 hours, 15 minutes. Everything is ready at the Cosmodrome for the launch of the Soviet spacecraft Soyuz. Five minutes remaining for launch. Onboard systems are now under onboard control. The right control board . . . opposite the commander's couch is now turned on. The cosmonauts have strapped themselves in and reported that they are ready. They have lowered their face plates. The key for launch has been inserted. . . . The crew is ready for launch.

Five minutes later, the fuelling tower was removed, and the command was given for launch. "Ignition. The engines are powered up. The launch; the booster is off. Moscow time 15 hours, 20 minutes, 10 seconds. The flight is proceeding normally." At 120 seconds into the flight, the strap-on booster units of the first stage were separated. Then at 160 seconds, the emergency abort system was jettisoned, followed by the separation of the launch shroud and the firing of the second-stage engines. Third-stage ignition took place at 270 seconds, orbital insertion at 530 seconds. The third stage was shut down, and the antennas and solar panels were extended. Kubasov asked the ground, "How do you read?" MCC-M responded that they heard them well. The initial orbital parameters were 220.8 by 185.07 kilometres, at the desired inclination of 51.80°, while the period of the first orbit was 88.6 minutes. There were smiles in Moscow and in Houston.

Seven hours later, the Apollo crew was aboard their spacecraft and preparing to launch when the Soyuz passed overhead. Stafford asked Karol "Bo" Bobko, the Spacecraft Communicator (CapCom) at 1.10, "Are you giving us the countdown in English or Russian today?" Bobko responded, "Oh, I figured I'd give it in English." In Moscow, the Soviet flight director was reminding Leonov and Kubasov that the Apollo lift-off was set for 10:50 Moscow time (2:50 CDT).

Apollo achieved orbital insertion at 2:59:55.5 central daylight time. Brand exclaimed, "Miy nakhoditsya na orbite!"

The Apollo spacecraft, configured as it would be for the meeting with the Soviet craft, was now in an orbit 173.3 by 154.7 kilometres with an orbital period of 87 minutes, 39 seconds, and an orbital velocity of 7,820 meters per second. Additional manoeuvres would bring Apollo and Soyuz into the proper orbital relationship for rendezvous. Apollo's orbit was circularised at 167.4 by 164.7 kilometres at 6:35. From this orbit, the first Apollo phasing manoeuvre was executed at 8:28 to provide the proper catch-up rate, so that docking with Soyuz could occur on the 36th Soviet revolution. This 20.5-meter-per-second change placed Apollo in a 233- by 169-kilometre path. The next phase and plane correction manoeuvre of 2.7 meters per second was scheduled for the 16th revolution.

16 July - Chase

While the Apollo crew slept, Leonov and Kubasov were awakened in the early morning hours of the 16th and were advised by Moscow control of the Apollo probe difficulty. The American ground team was still refining its solution to the problem. Besides exchanging greetings with the Soviet crew aboard Salyut 4 through the Moscow centre, the ASTP cosmonauts continued to attempt repairs on their troublesome black and white television system. Following instructions from the ground, the Soyuz crew went as far as to attempt a repair involving cutting away some of the lining of the spacecraft so they could gain access to a television wiring junction box. This unorthodox in-flight repair procedure failed, and the black and white system never did work. This failure upset some Americans, notably Bob Shafer, because this system's absence meant that there would be no pictures of Apollo during the flight. While some of the NASA team groused about this turn of events, the Soyuz crew members prepared for the circularisation manoeuvre that would bring their spacecraft into a 225- by 225-kilometre orbit. As they were executing that manoeuvre, the Apollo crew was awakened to the rock sounds of Chicago's "Good Morning Sunshine."

Stafford came back on the air-to-ground communications loop at 9:55 a.m. to tell Houston that the probe was out. With that "glitch" solved, the crew members could return their attention to the flight plan. Preparation for televising pictures from the cabin and checking out the docking module were the next activities on the list. As they worked through their schedule, the Soviet crew members were transmitting their first television pictures with their colour camera. Talking to the Soviet flight director, V. A. Dzhanibekov, Leonov gave the folks at home a commentary on their first 28 hours in space and then conversed with Klimuk and Sevastyanov, who had been aboard the space station Salyut since 24 May. Sevastyanov commented that the ASTP crews had a very responsible task and that a large portion of the world's population was watching and listening to their progress. Referring to the seven men now in space, two aboard Salyut and the five involved in ASTP, Klimuk said, "these are the magnificent seven." With pleasantries concluded, the Soviet crews returned to their respective duties. Leonov and Kubasov began lowering the pressure of their ship to 500 mm of Hg in preparation for the docking.

To round out its other activities, the crew made another course change at 3:18 p.m. In anticipation of their big day on the 17th, the Apollo team bedded down a few minutes after eight, and the Soviet crew had been resting since about 2:50 that afternoon. Throughout their "night," the spacecraft were coming closer together as Apollo closed the gap between them by about 255 kilometres per revolution.

17 July - Rendezvous

At 7:56, 5 minutes after completing another manoeuvre to bring the craft into better attitude for rendezvous, the Apollo crew attempted radio contact with Soyuz. Brand reported at 8:00 that he had sighted Soyuz in his sextant. "He's just a speck right now."

Voice contact between the two ships was established 5 minutes later. Speaking in Russian, Slayton called, "Soyuz, Apollo. How do you read me?" Kubasov answered in English, "Very well. Hello everybody."

Slayton: Hello, Valeriy. How are you. Good day, Valeriy.

Kubasov: How are you? Good day.

Slayton: Excellent. . . . I'm very happy. Good morning.

Leonov: Apollo, Soyuz. How do you read me?

Slayton: Alexey, I hear you excellently. How do you read me?

Leonov: I read you loud and clear.

Slayton: Good.

Thirty-two minutes later at Slayton's signal, Kubasov turned on the range tone transfer assembly to establish ranging between the ships. The gap had been reduced to 222 kilometres. At 9:12, Apollo had changed its path again when the crew executed a co-elliptic manoeuvre that sent the craft into a 210- by 209-kilometre orbit. Apollo was spiralling outward relative to the earth to overtake the Soviet ship.

A 0.9-second terminal phase engine burn at 10:17 brought Apollo within 35 kilometres, and the crew began to slow the spacecraft as it continued on the circular orbit that would intersect that of the Soyuz. CapCom Truly advised Stafford at 10:46, "I've got two messages for you: Moscow is go for docking; Houston is go for docking, it's up to you guys. Have fun." Immediately, Stafford called out to Leonov, "Half a mile, Alexey." Leonov replied. "Roger, 800 meters." In accordance with the flight plan, the Soyuz crew had moved back into the descent vehicle and closed the hatch between them and the orbital module. Inside Apollo, the men had closed the CSM and DM hatches preparatory to docking. At a command from Stafford, Leonov performed a 60° roll manoeuvre to give Soyuz the proper orientation relative to Apollo for the final approach. On the television monitors in Houston and Moscow, Soyuz was seen as a brilliant green against the deep black of space as the onboard camera recorded the final approach.

Visitors had begun to gather in the MOCR viewing room about 2 hours before the docking. Among the early arrivals were General Samuel C. Phillips, former Apollo Program Director; Astronauts Scott, Allen, Garriott, McCandless, Musgrave, and Schweickart; and Captain Jacques Cousteau. Just before 10:00, Dr. and Mrs. Fletcher, accompanied by John Young, escorted Ambassador Anatoliy Fedorovich Dobrynin and his wife into the viewing room. Other guests included Elmer S. Groo, Associate Administrator for Centre Operations, and his wife; the Gilruths; D. C. Cheatham; D. C. Wade; and C. C. Johnson. As Apollo silently closed the remaining gap, the MOCR and viewing area grew quiet. Only the air-to-air and air-to-ground transmissions broke the spell.

Leonov called out as the two ships came together. "Tom, please don't forget about your engine." This reference to the -X thrusters made Stafford and many of those on the ground who knew the story chuckle. Stafford called out the range, "less than five meters distance. Three meters. One meter. Contact." The hydraulic attenuators absorbed the force of the impact, and Leonov called out, "We have capture, . . . okay, Soyuz and Apollo are shaking hands now." It was 11:10 in Houston. Stafford retracted the guide ring, actuated the structural latches, and compressed the seals. In Russian he said, "Tell Professor Bushuyev it was a soft docking." "Well done, Tom," congratulated Leonov, "It was a good show. We're looking forward now to shaking hands with you on . . . board Soyuz."

The chase of Soyuz by Apollo had ended in a flawless docking. Stafford later recalled, "Later that night, we checked the alignment and noticed that the centre of the COAS was sitting right on the centre of a bolt that held the centre of the target in for Soyuz." That is dead centre. A feeling of relief and exultation swept the control centre in Houston. Lunney with a cigar in hand called Professor Bushuyev. Watching each other on their television monitors, the Technical Directors smiled as they exchanged congratulations, while both crews went through pressure integrity checks on their craft. When Slayton opened the hatch into the docking module, he caught the strong scent of burned glue. This news dampened spirits on the ground for a short time. As a precaution, Vance Brand donned his oxygen mask, and Stafford advised Leonov: "Soyuz, this is Apollo. Now we have . . . a little problem. I think we have somewhat of a bad atmosphere here. I think soon that we will no longer have any problems." While his Russian might not have won any prizes, the Soviet commander got Stafford's message. Once the odour dissipated and the ground crews decided that they could not discover any danger in this unexpected development, the crews continued the procedures leading to the opening of the hatches between the spacecraft.

Prior to that first handshake in space, Viktor Balashov, a noted Soviet television announcer, read a message from Leonid Ilyich Brezhnev over the air-to-ground link:

To the cosmonauts Alexey Leonov, Valeriy Kubasov, Thomas Stafford, Vance Brand, Donald Slayton. Speaking on behalf of the Soviet people, and for myself, I congratulate you on this memorable event. . . . The whole world is watching with rapt attention and admiration your joint activities in fulfilment of the complicated program of scientific experiments. The successful docking had confirmed the correctness of the technical decisions developed and realised by means of co-operative friendship between the Soviet and American scientists, designers and cosmonauts. One can say that the Soyuz Apollo is a forerunner of future international orbital stations.

Brezhnev's remarks continued, noting that "the détente and positive changes in the Soviet-American relations have made possible the first international spaceflight." He saw new possibilities for co-operation in the future and gave his best wishes to the crews.

Stafford and Slayton meanwhile had entered the docking module and closed behind them the hatch (no. 2) leading to the CSM. They raised the pressure from 255 to 490 millimetres by adding nitrogen to the previously 78 percent oxygen atmosphere. In Soyuz, the crew had reduced the cabin pressure to 500 millimetres before the docking. The pressure in the tunnel between the docking module hatch (no. 3) and the Soyuz hatch (no. 4) had been raised from zero to equal that of the docking module. Leonov and Kubasov were the first to open the hatch leading to the international greeting. During the transfer that was to follow, the pressure in the DM and Soyuz would be the same - 510 millimetres.

Then at 2:17:26 p.m. on the 17th of July, Stafford opened hatch number no. 3, which led into the Soyuz orbital module. With applause from the control centres in the background, Stafford looked into the Soviet craft and, seeing all their umbilicals and communications cables floating about, said, "Looks like they['ve] got a few snakes in there, too." Then he called out, "Alexey. Our viewers are here. Come over here, please." High above the French city of Metz, the two commanders shook hands. Their dialogue was broken - part personal, part technical. They appeared to accept their amazing technical accomplishment with the same nonchalance that had characterised their practice sessions in the ground simulators. There were no grand speeches, just a friendly greeting from men who seemed to have done this every day of their lives. In the background was a hand-lettered sign in English - "Welcome aboard Soyuz."

When they talked later with President Ford, however, the crews appeared somewhat less at ease. Ford had watched the Soyuz launch two days earlier in the State Department auditorium with Ambassador Dobrynin and Administrator Fletcher, while Mrs. Dobrynin interpreted for them. Keenly interested in the ASTP flight, Ford had wanted an opportunity to speak with the crews. Dennis Williams, the information officer attached to the International Affairs Office at NASA, had drafted a series of possible questions for the White House that could be asked of each crewman. Neither Williams nor the mission control team in Houston expected Ford to use all the questions, but that is exactly what he did. The crew, who had been advised the night before of the conversation, were taken by surprise when the President, watching the men on a television monitor in the Oval Office, talked for 9 minutes instead of the scheduled 5. He asked a barrage of questions that sent the crews scrambling to trade off their three flight helmets to they could respond to him. But despite the confusion, Ford and the five space men seemed to enjoy the chat. Ford began:

Gentlemen, let me call you to express my very great admiration for your hard work, your total dedication in preparing for this first joint flight. All of us here in . . . the United States send to you our very warmest congratulations for your successful rendezvous and for your docking and we wish you the very best for a successful completion of the remainder of your mission.

Stressing the same themes of co-operation as had Brezhnev, Ford pointed out that it had "taken us many years to open this door to useful co-operation in space between our two countries." When he asked Stafford whether he thought the new docking system would be suitable for use in future international manned space flights, the Apollo commander responded, "Yes, sir, Mr. President, I sure do. Out of the three docking systems I've used, this was the smoothest one so far. It worked beautifully." Ford spoke in turn to Leonov, Slayton, Brand, and Kubasov. The President asked Slayton, "as the world's oldest space rookie, do you have any advice for young people who hope to fly on future space missions?" Slayton responded that the best advice he could give was "decide what you want to do and then . . . never give up until you've done it." To Ford's question about space food, Kubasov noted that the meals were different than the one the crews had shared with the President, especially since there was neither seafood nor beer available during the flight. In signing off, the President wished the men a "soft landing."

Next Stafford, Slayton, Leonov, and Kubasov made a symbolic exchange of gifts, while Brand remained in the command module monitoring the American craft and waiting for his turn to visit Soyuz. Stafford speaking first, Said:

Alexey, Valeriy. Permit me, in the name of my government and the American people, to present you with 5 flags for your government and the people of the Soviet Union. May our joint work in space serve for the benefit of all countries and peoples on the Earth.

Leonov thanked Stafford for "these very valuable presents" and in return gave Soviet flags to the Americans. During succeeding transfers, other symbolic items would be exchanged. Apollo would return a United Nations flag launched in Soyuz, and the two crews would sign the Fédération Aeronautique Internationale certificates for the official record books.

The four men settled down to their first joint space banquet. On the ground, too, some people went in search of a snack. John Young escorted the Fletchers, the Dobrynins, and the Groos to a third floor snack bar in the Houston control centre. Over ice cream bars and coffee, they discussed the events of the day. The Ambassador asked Fletcher why the ships had docked a little early, and the NASA Administrator indicated that they were so well lined up that there was no reason not to complete the docking. Fletcher told Dobrynin that the crews had not known until late the preceding night that they would be speaking directly with Mr. Ford. After a few good-hearted comments about the President's tendency toward long-windedness, the Americans bid farewell to the Dobrynins, who left for Washington.

Glynn Lunney and Chet Lee met with representatives from the press late on the afternoon of the 17th to comment on the status of the meeting in space. Lunney said that those who had seen him in similar "change of shift briefings" in the past had seen a busy flight director with a dozen or so pages of notes. On this particular day, he had not taken many notes; he had mainly sat in the control centre "watching the Flight Directors and the rest of the team work." He continued:

I would like to say that I've enjoyed today one hell of a lot. I have talked a number of times to the man on the other side of the ocean, Professor Konstantin Bushuyev, who's my counterpart and Director of the ASTP program for the Soviet Union and I could tell from the sound of his voice that he's enjoying the day as much as I am. . . .

With his characteristic good humour, Lunney fielded a number of questions from the media representatives - the glue smell had not posed a problem; the crews had not talked much during their meal because "their mothers told them not to"; and there had been a scramble for headsets because no one had anticipated the President's desire to ask questions of all five men. Technically, diplomatically, and socially, the 17th had been a good day.

Stafford and Slayton said good-bye to Leonov and Kubasov at 5:47 and floated back through the tunnel into the docking module. Stafford returned to the command module, while Slayton closed the DM hatch. In Soyuz, the Soviets were securing their hatch, also. During the ensuing pressure integrity check, a possible leak through hatch nos. 3 or 4 was detected by the Soyuz monitoring equipment. This apparent flow of gas between the two hatches, while not serious, caused the crews to get to sleep a little later than planned. Finally, by 7:36, the Apollo crewmen had bid the ground good night and were beginning to settle down.

18 July - Transfers

Awakened by "Midnight in Moscow," the Americans began their fourth work day in orbit at 2:00 a.m. Houston time. While the crews had slept, the two ground teams in Houston led by Walt Guy and V. K. Novikov had been watching the pressure levels of both ships and had conferred about the leak between the hatches. They had concluded that after the two hatches were closed and the pressure had been reduced to 260 millimetres the gases trapped between them heated up. The pressure sensing devices could not distinguish between the expanding gases and a leak. Neil Hutchinson commented on working with Soviet Flight Director Vadim Kravets, whom he had never met:

the hatch integrity check . . . involved me getting on the loop and talking to my counterpart who happened to be Kravets . . . the answers were all forthcoming in a timely fashion and very professionally done. . . . I think the one thing, as I sit back and look at it now that makes me wonder; I wish there was another one of these flights. We've gone to all this trouble to learn how to work with those people. It's like going to the moon once and never going back. 90 per cent of the battle is over with . . . getting all the firsts done. . . . I could run another Apollo Soyuz or another joint anything with a heck of a lot less fuss than it took to get this one going.

Though some of the worry in both Houston and Moscow had been in vain, the two teams had confirmed that they could work together in analysing an unforeseen problem.

With breakfast behind them and their early morning activities completed, Kubasov and Brand conducted a broadcast session from "your Soviet American TV centre in space," as Kubasov called it. In giving his tour of Soyuz, the Soviet flight engineer pointed out what various instruments were for and televised a picture of Brand in "the kitchen" (the food preparation station) warming up lunch. Stafford reciprocated by giving Leonov and the Soviet viewers a Russian language tour of the command module. Despite some problems with communications to the ground, the space television production was just one more unique aspect of the joint mission. Appearing casually simple from the perspective of the home viewer, these broadcasts had required hours of negotiation and planning, just as all other aspects of the flight had. Soviet viewers were particularly enthralled by the live coverage of the mission, but many Americans seemed to accept shows from 225 kilometres up as commonplace.

Kubasov later gave an English language travelogue as the two craft passed over the USSR "Dear American TV people," he began. "It would be wrong to ask which country's more beautiful. It would be right to say there is nothing more beautiful than our blue planet." After explaining that he would be giving a description of "what flows below the spacecraft," Kubasov continued:

Our spacecraft, Soyuz, is approaching the USSR territory. Our country occupies one-sixth of the Earth's surface. Its population is over 250 million people. It consists of 15 Union Republics. The biggest is the Russian Federal Republic with the population of 135 million people. . . . At the moment we are flying over the place where Volgograd city is. It was called Stalingrad before. In winter 1942-43, German fascist troops were defeated by the Soviet Army here. . . .

With the television camera still trained out the port of the orbital module, Leonov continued to describe the panorama. In the command module with Stafford and Slayton, the Soviet commander spoke of the Ural Mountains, and he pointed out the area below in Kazakhstan from which they had been launched three days before. Toward the end of the 10-minute commentary, Brand added some remarks about the countryside he could see from his vantage point and concluded, "as you can tell, Soviets very much remember the war 30 years ago. Fortunately, we've come a long way since then. . .

Fifteen minutes later at about 8:20, Brand and Kubasov began filming some science demonstrations that could later be used in science classrooms back on earth to demonstrate the effects of zero gravity on various items. Originally proposed by Marshall Space Flight Centre, Kubasov became very enthusiastic about the idea of such demonstrations, which were similar in concept to those filmed during Skylab. As a result, he suggested simple illustrations of basic principles of physics, such as the gyroscope, to be recorded during the flight. Brand narrated the film in English, and Kubasov gave the Russian commentary. Literally nowhere on earth could a classroom instructor duplicate the experiments, not to mention having such celebrities give the explanations.

During this second transfer, Brand had lunched in Soyuz and Leonov in Apollo. At 10:43, Brand returned to Apollo, and Stafford and Leonov moved into Soyuz. Kubasov then transferred into the command module in this exacting cosmic ballet. With each movement of the crew members, the atmospheric composition of Soyuz had to be checked to make certain that not too much nitrogen had been removed. Once everyone was in place, the hatches between the orbital and docking modules were closed as a further step toward maintaining the proper cabin atmospheres. The highlight of the third transfer - the space-to-ground press conference - was about to begin.

Having collected questions in advance from news people in Moscow and Houston, Valeriy Vasil'yevich Illarionov of the visiting specialists team and Karol Bobko read the questions to the crews from Houston. The queries and the responses were friendly, in the spirit of the mission. Stafford began by saying that it had been a very rewarding two days in space. He felt that the success of the mission was the result of "the determination, the co-operation, and the efforts by the governments of the two countries, by the managers, engineers, and all the workers involved." When he first opened the hatch to greet Leonov and Kubasov, he had a couple of thoughts that he was unable to express at the time. He believed that when they opened those hatches in space, they were opening the possibility of a new era on earth. "I would have said," in Russian, "we were opening back on Earth a new era in the history of man." He noted that just how far that new era would go would depend upon "the determination, the commitments, and the faith of both countries and of the world." The "climate of détente and a developing co-operation between our countries" has made this mission possible, Leonov added.

Because of his participation in the first space welding in 1969, Kubasov was asked about materials processing in space. Kubasov believed that one of the future benefits of space programs would be the development of better and different alloys resulting from space processing. "It seems to me that the time will come when space will have whole plants, factories, for the production of new materials and new substances with new qualities, which could be . . . made only in space." Linked to that question was one from Moscow addressed to Stafford about the justification of spending money on space programs when there were so many problems in the world that needed solving.

Stafford noted that this was not a new question. He certainly believed that the costs would be repaid by the long term benefits. Science and applications were the likely areas of payoff, but the uplift to the human spirit was also implicit in his words and those of his colleagues. All the men agreed that they preferred news of peace and tranquillity, and Kubasov especially hoped that all children would have a future filled with peace, so that they would never have to know what it was like to lose parents or loved ones in a war. On a lighter note, when a Soviet reporter asked Leonov to transmit a sketch "that would depict the meaning, the essence of the joint mission," Leonov and Stafford held up two flags, one from the United States and one from the Soviet Union - although backwards, the message was clear enough. Leonov then went on to show the television audience a number of sketches that he had drawn - "Here's a whole cosmic portrait gallery."

The best lines of the press conference came later. When asked how he liked the American food, Leonov diplomatically answered, "I liked the way it was prepared, its freshness."

But as an old philosopher says, the best part of a good dinner is not what you eat, but with whom you eat. Today I have dinner together with my very good friends Tom Stafford and Deke Slayton because it was the best part of my dinner.

Slayton was asked how the experience of space flight compared to all the stories he had been told over the years. He said that he did not think he had discovered anything new.

We've had the same kind of problems up here that people have complained about since MR-3. . . . Not enough space, and a little congestion to the time line, difficulty in keeping up with things. It's a lot slower getting things done up here than you realise when you're down there in one-g. . . . In some respects, it's easier because weighty things are easier to move around, but, on the other hand, everything just tends to take off if you let go of it. . . . it's been a great experience. I don't think there's any way anybody can express how beautiful it is up here.

Looking to the future, Leonov was convinced that mankind was just at "the beginning of a great journey into outer space." As with the other ASTP crewmen, he hoped to have a chance to fly again. Stafford agreed and said that he would like to fly on one of the early Shuttle missions. "And I would hope that if Alexey would have a vehicle developed by [his] country that we could fly . . . in a joint mission." Not to be outdone, Leonov added, "I would always like to fly with friends . . . whom one trusts and with whom it is not dull to work. . . ."

The crews returned to other items on their flight plan. Slayton, as part of the earth observation experiment (MA-136), took photos of ocean currents off the Yucatan Peninsula and in the Florida straits. He also tried to observe the red tide phenomena - marine micro-organisms that cause the water to appear red - off the coast of Tampa and in the vicinity of Cape Cod. But this visual exercise was not completed because of cloud cover. Brand's travelogue of the East Coast of the US was likewise hindered by the clouds, but he gave the narration anyway, describing the climate and flora of Florida, North Carolina, Virginia, Washington, the Middle Atlantic states, and New England. As the ships passed over Massachusetts, Brand noted that Robert H. Goddard had launched the world's first liquid fuelled rocket from that state on 16 March 1926.

Leonov narrated the events of the fourth transfer as he saw them. He stressed the large amount of work they had to accomplish during the joint phase of the mission, including five bilateral experiments. Although this "saturated program" seemed at times to be more than the five men could handle, they managed to complete all their tasks. Slayton, Brand, and Kubasov assembled the two halves of a medallion commemorating the flight, and then they exchanged tree seeds. As Slayton juggled television equipment, Stafford and Leonov bid their final farewell. All these exercises climaxed one of the most complex television scenarios ever conceived and executed.

Tom Stafford shook hands with Leonov and Kubasov, bidding them farewell at about 3:49 in the afternoon. He then moved back into the docking module, and the space men closed the hatches for the last time at 4:00. Once the checklist for securing the hatches and executing the pressure integrity check of the seals was completed, the crews set about routine housekeeping chores - stowing equipment and making certain that all was in readiness for their next meal. For the statistically minded, the records indicate that Stafford spent 7 hours, 10 minutes aboard Soyuz, Brand 6:30, and Slayton 1:35. Leonov was on the American side for 5 hours, 43 minutes, while Kubasov spent 4:57 in the command and docking modules. To those at work in space and on the ground, it seemed longer.

Before finishing all the items on their pre-sleep checklist, the Americans paused to listen to the news and sports as read by CapCom Truly. Included in his report was mention of an American home exhibit that had just opened to enthusiastic crowds in Moscow. Called "Technology in the American Home," the display was designed to give Soviet citizens an idea of the gadgetry available to the American homemaker. While no one commented on the fact, it was just such an exhibit that had sparked the Nixon-Khrushchev debate in 1959. In 16 years' time, the international scene seemed to have changed dramatically.

Although the crew signed off for the evening on schedule at 7:20, they spent an uneasy first few hours. In addition to being very tired from the activities of their fourth day in space, they were jangled awake an hour later by a master alarm that reported a reduction in docking module oxygen pressure. This problem was no real hazard, and it was quickly solved by an increased flow of oxygen into the DM, but it kept the crew from getting all the sleep for which they had been scheduled. When wake-up time came at 3:13 on the morning of the 19th, the crew failed to hear the musical strains of "Tenderness" as sung by the Soviet female artist Maya Kristalinskaya, with which the ground team had hoped to gently waken them. But 15 minutes later, they were awake and ready to begin their fifth day. Next door, beyond hatches three and four, Leonov and Kubasov were getting prepared, too.

19 July - Exercises

During day five of the flight, the crews concentrated on docking exercises and experiments that involved the two ships in the undocked mode. During the interval between the first undocking and the second docking, the Apollo crew placed its craft between Soyuz and the sun so that the diameter of the service module formed a disk which blocked out the sun. This artificial solar eclipse, as viewed from Soyuz, permitted Leonov and Kubasov to photograph the solar corona. Ground-based observations were conducted simultaneously, so that the Soviet astronomer G. M. Nikolsky could compare views of the solar phenomena with and without the interference of the earth's atmosphere. Skylab had provided a long term look at the corona, and the ASTP data would give scientists an opportunity to compare findings made a year and a half later. This "artificial solar eclipse" (MA-148) experiment would be the last American chance for such information gathering until the Shuttle era.

Another major experiment, "ultraviolet absorption" (MA-059), was an effort to more precisely determine the quantities of atomic oxygen and atomic nitrogen existing at such altitudes as the one in which Apollo and Soyuz were orbiting. Again this information could not readily be obtained from ground-based observations because of the intervening layers of atmosphere. Apollo, flying out of plane around Soyuz, first at 150 meters, then at 500 meters, and finally in plane at 1,000 meters, projected monochromatic laser-like beams of light to retro-reflectors mounted on Soyuz. When the beams were reflected back to Apollo, they were received by a spectrometer, which recorded the wavelength of the light. Subsequent analysis of these data would yield information on the quantities of oxygen and nitrogen. Some very precise flying was called for in these experiments.

After being docked for nearly 44 hours, Apollo and Soyuz had parted for the first time at 7:12 a.m. while out of contact with the ground. Slayton advised Bobko after radio contact was re-established that they had undocked without incident and were station-keeping at a range of 50 meters. Meanwhile, Soyuz had extended the guide ring on its docking system in order to test the Soviet mechanism in the active configuration. Once they completed the solar eclipse experiment, with Slayton at the controls, Apollo moved towards Soyuz for the second docking. As he did, Stafford called out to the ground, "Okay, Houston, Deke's having the same problem with the COAS washout that I had." As Slayton explained it, he could see Soyuz and the target initially when they were against the dark sky, but at "about 100 meters or so, it went against the earth background and zap. Man, I didn't have anything." Although worried that he might run over Soyuz, he pressed on with the docking "by the seat of the pants and I guess I got a little closer than they or the ground anticipated." There was too much light flowing into the optical alignment sight for Slayton to get a good view of the docking target. Contact with Soyuz came at 7:33:39, and Leonov advised the Americans that he was beginning to retract his side of the docking assembly.

As viewed via Apollo television, this docking looked as if it had been harder than the first, and the two ships continued to sway after capture had been completed. Slayton, speaking in a debriefing, later said:

The docking was normal, you guys gave me contact as usual and then I gave it thrusting. The only thing that happened then was they seemed to torque off. I was surprised at the angle they banged off there after we had contact.

Despite this oscillation, the Soyuz system aligned the two craft and a proper retraction was completed. Subsequently, there was some discussion of this docking, and the Soviet docking specialist Syromyatnikov was at first worried that an unnecessary strain might have been placed on the Soyuz gear. Bob White said that analysis of the telemetry data indicated that Slayton had inadvertently fired the roll thrusters for approximately 3 seconds after contact, and that this sideways force caused the craft to oscillate after the docking systems were locked and rigid.

But even with the extra thrusting, the second docking was within the limits of safety established for the docking system. Slayton's docking took place at a forward velocity of 0.18 meter per second versus 0.25 meter per second for Stafford's docking, but the difference lay in the inadvertent thrusting. Momentarily an issue, the extra motion of Slayton's try was not a serious concern after all the data had been evaluated. Even Syromyatnikov had to concede that "the mechanism functioned well under unfavourable conditions." It was a case of things looking worse than they really were. In the end, the incident only demonstrated the reliability and hardiness of the new docking system.

It was 10:27 when Apollo and Soyuz undocked for the second and final time. This 4-minute exercise was conducted by Leonov, since it was a Soyuz active undocking. Slayton then moved his ship to a station-keeping distance, about 40 meters away. As he did, Leonov opened the retro-reflector covers so that the ultraviolet absorption (UVA) experiment could be performed. A difficult series of manoeuvres were called for in this test. As Soyuz continued its circular orbit, Slayton took Apollo out of plane with Soyuz and oriented his craft so that its nose was pointed at the reflector on the side of the other ship. Orbiting sideways in this configuration, Slayton flew Apollo in a small arc from the front of Soyuz to the rear of that ship while the spectrometer gathered the reflected beams. On the 150-meter phase of the experiment, light from a Soyuz port led to a misalignment of the spectrometer, but on the 500-meter pass excellent data were received; on the 1,000-meter pass satisfactory results were also obtained.

After nearly 3 hours of tough flying, Bobko congratulated the crew. "You people flew it fine." Slayton responded:

Okay. Great, Bo. And you can thank ol' Roger Burke, Steve Grega, and Bob Anderson, down there, that everything came off right. 'Cause they sure did all the work to make it go.

The three men Slayton mentioned had spent hours in the simulators working out the procedures to fly this complicated manoeuvre. Burke, who had worked with developing flight procedures for years, felt that this was one of the hardest experiments a crew had ever been called on to do, especially since the flight plan for it had continued to evolve until a couple of days before launch. Slayton later noted that it had taken all three Apollo crewmen to complete the ultraviolet absorption experiment. "I was doing the flying, Vance was running the computer and we had Tom down in the equipment bay opening and closing doors, turning on sensors and so forth. So, it was a busy time for all of us." He indicated that the manoeuvres were difficult because orbital mechanics came into play as they tried to fly around Soyuz. When the Apollo crew changed the velocity of their craft, they also affected its orbit. They would have no difficulties if they had had unlimited fuel resources, but being out of plane and playing orbital mechanics with "a very limited fuel budget . . . made it a great challenge." Stafford added that the thruster firings had to be timed because the onboard accelerometers could not measure the changes in velocity.

Apollo performed a separation manoeuvre at 1:42 to prevent re-contact with Soyuz, placing the American craft in a 217- by 219-kilometre orbit. With all the joint flight activities completed, the ships were going their separate ways. Soyuz was below and moving ahead of Apollo at a rate of 6 to 8 kilometres per orbit. Leonov and Kubasov prepared to go to sleep, but the American crew had several hours of work scheduled in their crowded flight plan after their mid-afternoon meal before they could settle down for a rest period. The fifth day of ASTP - the second of joint activities - had been a success, and everyone in the Moscow and Houston control centres was pleased that all had gone so well.

20 July - Independent Activities

Kubasov and Leonov began their sixth day in space at 1:10 a.m. while their American friends slept. They had breakfast and carried out a series of activities that included earth and solar photography and recording data photographically on the joint zone-forming fungi experiment and other unilateral experiments. Leonov also ran through a simulation of the deorbit procedures - orientation, retrofire, and the deployment of the parachutes. At mid-afternoon Moscow time (sunup in Houston), the Soviet space travellers gave a television broadcast to their viewers at home. Afterwards, they continued their experiments and preparations for their re-entry 24 hours later.

21 July - Farewell

Leonov and Kubasov had signed off the air shortly after 1:37 (9:37 in Moscow) on the afternoon of the 20th, after stowing all of the returnable items in the descent module. Following a rest period of nearly 10 hours, the Soyuz crewmen advised the ground that they were awake and that all systems were normal. After exchanging flight data and receiving a weather report, they ate breakfast and donned their space suits. Their pressure integrity check, conducted at about 3:30 a.m. indicated that their suits were functioning normally. Leonov and Kubasov ran through their re-entry checklist. Moscow Mission Control gave the following announcement:

The Mission Control Center's calculated the descent-orbit data. This data has been entered into the program computer . . . the crew is monitoring the orientation and also the transmission of information. The deorbit data . . . is the following . . . the braking pulse to shift the spacecraft from Earth to a descent trajectory will be 120 meters per second. This braking pulse . . . will operate for 194.9 seconds at the altitude of 214 kilometres and 13 hours and 9 minutes.

Throughout the Soviet Union, crowds gathered in homes and in stores with televisions to watch the rare treat of a live broadcast of a Soyuz recovery. At Houston, a few hardy souls, in addition to the ground control team, were up to witness this early morning event.

The deorbit burn came exactly on time (5:09 in Houston), and the Soyuz crew notified Moscow that the retro-engine had fired for the calculated period and had been turned off at 5:13:38. Separation of the orbital and descent modules came 9 minutes later. Leonov advised the ground that the gravitational forces had built up, passed, and were less than he had anticipated. A task force of Soviet helicopters and ground-based personnel moved into the landing area. All in all, this formidable armada of trucks and aircraft was about equal in number to the size of the sea-based team that would later greet Apollo.

Soviet air rescue pilots began receiving radio signals from the spacecraft at approximately 5:40, and almost simultaneously helicopter-borne television cameras began transmitting pictures of the descent. As Soyuz floated downward, Walter Cronkite, in search of commentary on the event, noted for his viewers that the colour quality of the pictures was not very good. But good or bad, they were extraordinary! Within a few feet of the ground, the automatically fired landing rockets slowed the "thumpdown" of the descent vehicle. A cloud of dust caused by the braking rockets of Soyuz engulfed the craft and caused momentary anxiety for those viewers who did not understand its meaning. Three minutes after landing, at 5:51, a slightly shaky Kubasov was the first to exit. Leonov and his flight engineer smiled broadly and waved to photographers on the scene. Houston Mission Control reported: "We're just looking at the TV here and see that Soyuz has landed safely, and Alexey and Valeriy were outside of the spacecraft and seem to be in good health." Stafford asked Houston to give the Soviets their best and to say that he was glad to hear that everything went well. For the remaining three and a half days, Stafford, Slayton, and Brand would concentrate on their experiments, but in many respects the saga of Apollo and Soyuz had come to an end.

Maneuver Summary:
191 km X 218 km orbit to 185 km X 240 km orbit. Delta V: 7 m/s
185 km X 240 km orbit to 198 km X 223 km orbit. Delta V: 8 m/s
198 km X 223 km orbit to 190 km X 229 km orbit. Delta V: 3 m/s
190 km X 229 km orbit to 218 km X 231 km orbit. Delta V: 8 m/s
Total Delta V: 26 m/s

AKA: Soyuz (Union ).
First Launch: 1975.07.15.
Last Launch: 1975.07.21.
Duration: 5.94 days.

More... - Chronology...


Associated People
  • Filipchenko Filipchenko, Anatoli Vassilyevich (1928-) Russian pilot cosmonaut. Flew on Soyuz 7, Soyuz 16. More...
  • Rukavishnikov Rukavishnikov, Nikolai Nikolayevich (1932-2002) Russian engineer cosmonaut. Flew on Soyuz 10, Soyuz 16, Salyut 6 EP-5-1. More...
  • Leonov Leonov, Aleksei Arkhipovich (1934-) Russian pilot cosmonaut. First person to walk in space. Flew on Voskhod 2, Soyuz 19 (ASTP). Cancelled missions included command of first Soviet circumlunar flight in 1969 and first military space station mission in 1973. More...
  • Kubasov Kubasov, Valeri Nikolayevich (1935-) Russian engineer cosmonaut. Flew on Soyuz 6, Soyuz 19 (ASTP), Salyut 6 EP-5. Flew in first docking mission between American and Soviet spacecraft. Missed two chances to be first engineer on a Soviet space station (Cosmos 557 and Soyuz 11). More...
  • Ivanchenkov Ivanchenkov, Aleksandr Segeyevich (1940-) Russian engineer cosmonaut. Flew on Salyut 6 EO-2, Salyut 7 EP-1. Graduated MAI, 1964 Civilian Engineer, Korolev OKB. Trained for a Buran flight. From 1993 served as deputy director of 29th Department, RKK Energia. More...
  • Andreyev Andreyev, Boris Dmitriyevich (1940-) Russian engineer cosmonaut, 1972-1983. Off flight roster for medical reasons. Civilian Engineer, Korolev OKB More...
  • Dzhanibekov Dzhanibekov, Vladimir Aleksandrovich (1942-) Russian pilot cosmonaut. Flew on Salyut 6 EP-1, Salyut 6 EP-9, Salyut 7 EP-1, Salyut 7 EP-4, Salyut 7 EO-4-1b. More...
  • Romanenko Romanenko, Yuri Viktorovich (1944-) Russian pilot cosmonaut. Flew on Salyut 6 EO-1, Salyut 6 EP-8, Mir LD-1. Father of cosmonaut Roman Romanenko. 430 cumulative days in space. More...

Associated Countries
Associated Spacecraft
  • Soyuz 7K-TM Russian manned spacecraft. 4 launches, 1974.04.03 (Cosmos 638) to 1975.07.15 (Soyuz 19 (ASTP)). The Soyuz 7K-T as modified for the docking with Apollo. More...

See also
Associated Manufacturers and Agencies
  • MOM Russian agency overseeing development of spacecraft. Ministry of General Machine Building (Moskva, Russia), Moscow, Russia. More...

Associated Programs
  • ASTP Apollo-Soyuz Test Project. Meetings began in 1969 between Russian and American representatives on a joint manned space mission. Ambitious plans for use of Skylab or Salyut space stations were not approved. Instead it was decided to develop a universal docking system for space rescue. A working group was set up in October 1970 and in May 1972 the USA/USSR Agreement was signed with launch to take place in 1975. D Bushuev and G Lanin were the technical directors of the Soviet-designed EPAS docking system program. 1600 experiments were conducted in developing the system. More...

Associated Launch Sites
  • Baikonur Russia's largest cosmodrome, the only one used for manned launches and with facilities for the larger Proton, N1, and Energia launch vehicles. The spaceport ended up on foreign soil after the break-up of Soviet Union. The official designations NIIP-5 and GIK-5 are used in official Soviet histories. It was also universally referred to as Tyuratam by both Soviet military staff and engineers, and the US intelligence agencies. Since the dissolution of the Soviet Union the Russian Federation has insisted on continued use of the old Soviet 'public' name of Baikonur. In its Kazakh (Kazak) version this is rendered Baykonur. More...

Soyuz 19 (ASTP) Chronology


1975 July 15 - . 12:20 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC1. LV Family: R-7. Launch Vehicle: Soyuz 11A511U.
  • Soyuz 19 (ASTP) - . Call Sign: Soyuz (Union ). Crew: Kubasov; Leonov. Backup Crew: Filipchenko; Rukavishnikov. Support Crew: Andreyev; Dzhanibekov; Ivanchenkov; Romanenko. Payload: Soyuz ASTP s/n 75 (EPSA). Mass: 6,790 kg (14,960 lb). Nation: USSR. Related Persons: Kubasov; Leonov; Filipchenko; Rukavishnikov; Andreyev; Dzhanibekov; Ivanchenkov; Romanenko. Agency: MOM. Program: ASTP. Class: Manned. Type: Manned spacecraft. Flight: Soyuz 19 (ASTP); Apollo (ASTP). Spacecraft: Soyuz 7K-TM. Duration: 5.94 days. Decay Date: 1975-07-21 . USAF Sat Cat: 8030 . COSPAR: 1975-065A. Apogee: 220 km (130 mi). Perigee: 186 km (115 mi). Inclination: 51.8000 deg. Period: 88.50 min. Soyuz 19 initial orbital parameters were 220.8 by 185.07 kilometres, at the desired inclination of 51.80°, while the period of the first orbit was 88.6 minutes. On 17 July the two spacecraft docked. The crew members rotated between the two spacecraft and conducted various mainly ceremonial activities. Leonov was on the American side for 5 hours, 43 minutes, while Kubasov spent 4:57 in the command and docking modules.

    After being docked for nearly 44 hours, Apollo and Soyuz parted for the first time and were station-keeping at a range of 50 meters. The Apollo crew placed its craft between Soyuz and the sun so that the diameter of the service module formed a disk which blocked out the sun. After this experiment Apollo moved towards Soyuz for the second docking.

    Three hours later Apollo and Soyuz undocked for the second and final time. The spacecraft moved to a 40 m station-keeping distance so that an ultraviolet absorption experiment could be performed. With all the joint flight activities completed, the ships went on their separate ways.


1975 July 15 - . 19:50 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC39B. LV Family: Saturn I. Launch Vehicle: Saturn IB. LV Configuration: Saturn IB SA-210.
  • Apollo (ASTP) - . Call Sign: Apollo. Crew: Brand; Slayton; Stafford. Backup Crew: Bean; Evans; Lousma. Payload: Apollo CSM 111. Mass: 14,768 kg (32,557 lb). Nation: USA. Related Persons: Brand; Slayton; Stafford; Bean; Evans; Lousma. Agency: NASA Houston. Program: ASTP. Class: Moon. Type: Manned lunar spacecraft. Flight: Soyuz 19 (ASTP); Apollo (ASTP). Spacecraft: Apollo CSM. Duration: 9.06 days. Decay Date: 1975-07-24 . USAF Sat Cat: 8032 . COSPAR: 1975-066A. Apogee: 166 km (103 mi). Perigee: 152 km (94 mi). Inclination: 51.7000 deg. Period: 87.60 min. This flight marked the culmination of the Apollo-Soyuz Test Project, a post-moon race 'goodwill' flight to test a common docking system for space rescue. 15 July 1975 began with the flawless launch of Soyuz 19. Apollo followed right on schedule. Despite a stowaway - a 'super Florida mosquito' - the crew accomplished a series of rendezvous manoeuvres over the next day resulting in rendezvous with Soyuz 19. At 11:10 on 17 July the two spacecraft docked. The crew members rotated between the two spacecraft and conducted various mainly ceremonial activities. Stafford spent 7 hours, 10 minutes aboard Soyuz, Brand 6:30, and Slayton 1:35. Leonov was on the American side for 5 hours, 43 minutes, while Kubasov spent 4:57 in the command and docking modules.

    After being docked for nearly 44 hours, Apollo and Soyuz parted for the first time and were station-keeping at a range of 50 meters. The Apollo crew placed its craft between Soyuz and the sun so that the diameter of the service module formed a disk which blocked out the sun. This artificial solar eclipse, as viewed from Soyuz, permitted photography of the solar corona. After this experiment Apollo moved towards Soyuz for the second docking.

    Three hours later Apollo and Soyuz undocked for the second and final time. The spacecraft moved to a 40 m station-keeping distance so that the ultraviolet absorption (UVA MA-059) experiment could be performed. This was an effort to more precisely determine the quantities of atomic oxygen and atomic nitrogen existing at such altitudes. Apollo, flying out of plane around Soyuz, projected monochromatic laser-like beams of light to retro-reflectors mounted on Soyuz. On the 150-meter phase of the experiment, light from a Soyuz port led to a misalignment of the spectrometer, but on the 500-meter pass excellent data were received; on the 1,000-meter pass satisfactory results were also obtained.

    With all the joint flight activities completed, the ships went on their separate ways. On 20 July the Apollo crew conducted earth observation, experiments in the multipurpose furnace (MA-010), extreme ultraviolet surveying (MA-083), crystal growth (MA-085), and helium glow (MA-088). On 21 July Soyuz 19 landed safely in Kazakhstan. Apollo continued in orbit on 22-23 July to conduct 23 independent experiments - including a doppler tracking experiment (MA-089) and geodynamics experiment (MA-128) designed to verify which of two techniques would be best suited for studying plate tectonics from earth orbit.

    After donning their space suits, the crew vented the command module tunnel and jettisoned the docking module. The docking module would continue on its way until it re-entered the earth's atmosphere and burned up in August 1975.


1975 July 16 - .
  • ASTP - Rendezvous Maneuvers - . Nation: USA. Program: ASTP. Flight: Soyuz 19 (ASTP); Apollo (ASTP). Summary: Apollo and Soyuz modify their orbits in preparation for the docking in space planned for the next day.. Additional Details: here....

1975 July 17 - .
  • ASTP - The 'Handshake in Space'. - . Nation: USA. Program: ASTP. Flight: Soyuz 19 (ASTP); Apollo (ASTP). Summary: Apollo and Soyuz successfully dock and members of the American and Russian crews shake hands in space for the first time. With the Soviet-American détente crumbling, it will be the last such docking for 20 years.. Additional Details: here....

1975 July 18 - .
  • ASTP-Crew transfers between the docked vehicles. - . Nation: USA. Program: ASTP. Flight: Soyuz 19 (ASTP); Apollo (ASTP). The crew members take turns visiting each other's capsules, a complicated procedure due to the need to keep both spacecraft manned at all times and for the transfer crews to transition in the docking module between the different Soyuz and Apollo cabin atmospheres. Additional Details: here....

1975 July 19 - .
  • ASTP - Joint Apollo/Soyuz flight activities - . Nation: USA. Program: ASTP. Flight: Soyuz 19 (ASTP); Apollo (ASTP). During day five of the flight, the crews concentrated on docking exercises and experiments that involved the two ships in the undocked mode. During the interval between the first undocking and the second docking, the Apollo crew placed its craft between Soyuz and the sun so that the diameter of the service module formed a disk which blocked out the sun. This artificial solar eclipse, as viewed from Soyuz, permitted Leonov and Kubasov to photograph the solar corona. Additional Details: here....

1975 July 20 - .
  • ASTP - Separate Apollo/Soyuz activities - . Nation: USA. Program: ASTP. Flight: Soyuz 19 (ASTP); Apollo (ASTP). Summary: Apollo and Soyuz, now flying in separate orbits, conduct independent experiments prior to their return to earth.. Additional Details: here....

1975 July 21 - .
  • ASTP - Soyuz returns to earth, Apollo remains in orbit. - . Nation: USSR. Program: ASTP. Flight: Soyuz 19 (ASTP); Apollo (ASTP). Following a rest period of nearly 10 hours, the Soyuz crewmen advised the ground that they were awake and that all systems were normal. The deorbit burn came exactly on time (5:09 in Houston), and the Soyuz crew landed safely in Kazakhstan. For the remaining three and a half days, Stafford, Slayton, and Brand would concentrate on their experiments, but in many respects the saga of Apollo and Soyuz had come to an end.

1975 July 21 - .
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