Human Spaceflights

International Flight No. 55



hi res version (1,29 MB)

hi res version (805 KB)

Launch, orbit and landing data

Launch date:  15.07.1975
Launch time:  19:50 UTC
Launch site:  Cape Canaveral (KSC)
Launch pad:  39-B
Altitude:  170 - 228 km
Declination:  51.76°
Docking Soyuz 19:  17.07.1975, 16:09:09 UTC
Undocking Soyuz 19:  19.07.1975, 15:26:12 UTC
Landing date:  24.07.1975
Landing time:  21:18 UTC
Landing site:  21° 52' N, 162° 45' W

walkout photo

hi res version (720 KB)

alternate crew photo

alternate crew photo

alternate crew photo

alternate crew photo

alternate crew photo

alternate crew photo


No.   Surname Given names Position Flight No. Duration Orbits
1  Stafford  Thomas Patten "Tom"  CDR 4 9d 01h 28m  138 
2  Brand  Vance DeVoe  PLT 1 9d 01h 28m  138 
3  Slayton  Donald Kent "Deke"  DMP 1 9d 01h 28m  138 

Crew seating arrangement

1  Stafford
2  Brand
3  Slayton
1  Brand
2  Stafford
3  Slayton

Backup Crew

No.   Surname Given names Position
1  Bean  Alan LaVern  CDR
2  Evans  Ronald Ellwin, Jr. "Ron"  PLT
3  Lousma  Jack Robert  DMP

hi res version (833 KB)

alternate crew photo

alternate crew photo

Support Crew

  Surname Given names
 Bobko  Karol Joseph "Bo"
 Crippen  Robert Laurel "Crip"
 Overmyer  Robert Franklyn
 Truly  Richard Harrison "Dick"


Launch from Cape Canaveral; landing in the Pacific Ocean near Hawaii; first U.S.-U.S.S.R joint manned mission Apollo-Soyuz.

Jack Swigert had originally been assigned as the command module pilot for the ASTP prime crew, but prior to the official announcement he was removed as punishment for his involvement in the Apollo 15 postage stamp scandal.

This mission was the first joint U.S.–Soviet space flight, and the last flight of an Apollo spacecraft. Its primary purpose was as a symbol of the policy of détente that the two superpowers were pursuing at the time, and marked the end of the Space Race between them that began in 1957.

The Soyuz and Apollo flights launched within seven-and-a-half hours.
The Apollo Command & Service Module (CSM) was launched with a docking module specially designed to enable the two spacecraft to dock with each other, used only once for this mission. The docking module was designed as both an airlock - as the Apollo was pressurized at 5.0 psi using pure oxygen, while the Soyuz used a nitrogen/oxygen atmosphere at sea level pressure - and an adapter, since the surplus Apollo hardware used for the ASTP mission was not equipped with the APAS docking collar jointly developed by NASA and the Soviet Academy of Sciences for the mission. One end of the docking module was attached to the Apollo using the same "probe-and-drogue" docking mechanism used on the Lunar Module and the Skylab space station, while its other end had the APAS docking collar, which Soyuz 19 carried in place of the standard Soyuz/Salyut system of the time. The APAS fitting with the Soyuz 19 was releasable, allowing the two spacecraft to separate.

The Apollo spacecraft docked with Soyuz 19. The docking adapter had been carried through Apollo. It was the first docking in space history between two spacecraft launched from different countries. 44 hours of docked joint activities which included 4 crew transfers between the Apollo and the Soyuz followed. The mission included both joint and separate scientific experiments (including an engineered eclipse of the Sun by Apollo to allow Soyuz to take photographs of the solar corona), and provided useful engineering experience for future joint US–Russian space flights.

After seperation of the spacecrafts a second docking with Soyuz 19 as the active spacecraft was done, but no more crew transfers. After the final separating the Apollo crew accomplished 23 different scientific experiments, as earth observation, experiments in the multipurpose furnace (MA-010), extreme ultraviolet surveying (MA-083), crystal growth (MA-085), a helium glow experiment (MA-088), a doppler tracking experiment (MA-089) and geodynamics experiment (MA-128).

The only serious problem was during reentry and splashdown of the Apollo craft, during which the crew were accidentally exposed to toxic nitrogen tetroxide fumes, caused by the reaction control system (RCS) oxidizer) venting from the spacecraft and reentering a cabin air intake. The RCS was inadvertently left on during descent, and highly toxic nitrogen tetroxide was sucked into the spacecraft as it drew in outside air. Vance Brand briefly lost consciousness, while Thomas Stafford retrieved emergency oxygen masks, put one on Vance Brand, and gave one to Donald Slayton. The three astronauts were hospitalized for two weeks in Honolulu.

The recovery ship was the USS New Orleans. This was the last NASA mission for several years. The Apollo program ended.

Photos / Drawings

ASTP integration


Last update on November 16, 2014.