Project Gemini Duration 1962-1966 Goals Long-duration spaceflight; rendezvous and docking; extra-vehicular activity; targeted re-entry and Earth landing Achieved Eight-day flight necessary for Apollo; 14-day endurance flight; first American spacewalk; first rendezvous; first docking; demonstrated ability to work in EVA without tiring Crew 2 Launch vehicles Titan II GLV Other vehicles Agena, docking target Organizer NASA Related programs Mercury and Apollo
Project Gemini was the second human spaceflight program of NASA, the civilian space agency of the United States government. Project Gemini was conducted between projects Mercury and Apollo, with ten manned flights occurring in 1965 and 1966.
Its objective was to develop space travel techniques in support of Apollo, which had the goal of landing men on the Moon. Gemini achieved missions long enough for a trip to the Moon and back, perfected extra-vehicular activity (working outside a spacecraft), and orbital maneuvers necessary to achieve rendezvous and docking. All manned Gemini flights were launched from Cape Canaveral, Florida using the Titan II GLV launch vehicle.
After the existing Apollo program was chartered by President John F. Kennedy on May 25, 1961 to land men on the Moon, it became evident to NASA officials that a follow-on to the Mercury program was required to develop certain spaceflight capabilities in support of Apollo. Originally introduced on December 7 as Mercury Mark II, it was re-christened Project Gemini on January 3, 1962, from the fact that the spacecraft would hold two crewmen, seated abreast, as gemini in Latin means "twins" or "side-by-side". Gemini is also the name of the third constellation of the Zodiac and its twin stars, Castor and Pollux.
The major objectives were:
- To demonstrate endurance of humans and equipment to spaceflight for extended periods, at least eight days required for a Moon landing, to a maximum of two weeks
- To effect rendezvous and docking with another vehicle, and to maneuver the combined spacecraft using the propulsion system of the target vehicle
- To demonstrate Extra-Vehicular Activity (EVA), or space-"walks" outside the protection of the spacecraft, and to evaluate the astronauts' ability to perform tasks there
- To perfect techniques of atmospheric reentry and landing at a pre-selected location
- To provide the astronauts with zero-gravity, rendezvous, and docking experience required for Apollo
Gemini was designed by a Canadian, Jim Chamberlin, formerly the chief aerodynamicist on the Avro Arrow fighter interceptor program with Avro Canada. Chamberlin joined NASA along with 25 senior Avro engineers after cancellation of the Arrow program, and became head of the U.S. Space Task Group’s engineering division in charge of Gemini. The prime contractor was McDonnell Aircraft, which had also been the prime contractor for the Project Mercury capsule.
In addition, astronaut Gus Grissom was heavily involved in the development and design of the Gemini spacecraft. He writes in his posthumous 1968 book Gemini! that the realization of Project Mercury's end and the unlikelihood of his having another flight in that program prompted him to focus all of his efforts on the upcoming Gemini Program.
The Gemini program was managed by the Manned Spacecraft Center, Houston, Texas, under direction of the Office of Manned Space Flight, NASA Headquarters, Washington, D.C, Dr. George E. Mueller, Associate Administrator of NASA for Manned Space Flight, served as acting director of the Gemini program. William C. Schneider, Deputy Director of Manned Space Flight for Mission Operations, served as mission director on all Gemini flights beginning with Gemini VI.
Guenther Wendt was a McDonnell engineer who supervised launch preparations for both the Mercury and Gemini programs. His team was responsible for completion of the complex pad close-out procedures just prior to spacecraft launch, and he personally closed the hatches before flight. The astronauts appreciated his taking absolute authority over, and responsibility for, the condition of the spacecraft and developed a good-humored rapport with him.
NASA selected McDonnell Aircraft, which had been the prime contractor for the Project Mercury capsule, to build the Gemini capsule in 1961 and the first capsule was delivered in 1963. The spacecraft was 19 feet long and 10 feet wide with a launch weight of 8,490 pounds. The Gemini capsule first flew with a crew on March 23, 1965.
Gemini was the first manned spacecraft to include an onboard computer, the Gemini Guidance Computer, to facilitate management and control of mission maneuvers. Unlike the Mercury, it used ejection seats, in-flight radar and an artificial horizon—devices borrowed from the aviation industry.
A major difference between the Gemini and Mercury spacecraft was that Mercury had all systems other than the reentry rockets situated within the capsule, most of which were accessed through the astronaut's hatchway. In contrast, Gemini housed power, propulsion, and life support systems in a detachable Equipment Module located behind the Reentry Module, which made it similar to the Apollo Command/Service Module design. Many components in the capsule itself were reachable through their own small access doors.
The original intention was for Gemini to land on solid ground instead of at sea, using a Rogallo wing airfoil rather than a parachute, with the crew seated upright controlling the forward motion of the craft. To facilitate this, the airfoil did not attach just to the nose of the craft, but to an additional attachment point for balance near the heat shield. This cord was covered by a strip of metal which ran between the twin hatches. This design was ultimately dropped, and parachutes were used to make a sea landing as in Project Mercury. The capsule was suspended at an angle closer to horizontal, so that a side of the heat shield contacted the water first. This eliminated the need for the landing bag cushion used in the Mercury capsule.
Early short-duration missions had their electrical power supplied by batteries; later endurance missions used the first fuel cells in manned spacecraft.
Unlike Mercury, which could only change its orientation in space, the Gemini spacecraft could translate in all six directions, and alter its orbit. It was designed to dock with the Agena target vehicle, which had its own larger rocket engine which was used to perform major orbital changes.
16 astronauts flew on the 10 manned Gemini missions. Some of them like Grissom had come from the Mercury project where as others like Armstrong were new.
- For details please see: List of Gemini astronauts.
Deke Slayton, as director of flight crew operations, had the main role in the choice of crews for the Gemini program. With Gemini it became a procedure that each flight had a primary crew and backup crew, and that the backup crew would rotate to primary crew status three flights later. Slayton also intended for first choice of mission commands to be given to the four remaining active astronauts of the Mercury Seven: Alan Shepard, Grissom, Cooper, and Schirra. (John Glenn had retired from NASA in January 1964 and Scott Carpenter, who was blamed by some in NASA management for the problematic reentry of Aurora 7, was on leave to participate in the Navy's SEALAB project and was grounded from flight in July 1964 due to an arm injury sustained in a motorbike accident. Slayton himself continued to be grounded due to a heart problem.)
In late 1963, Slayton selected Shepard and Stafford for Gemini 3, McDivitt and White for Gemini 4, and Schirra and Young for Gemini 5 (which was to be the first Agena rendezvous mission). Backup crew for Gemini 3 was Grissom and Borman, who were also slated for Gemini 6, to be the first long-duration mission. Finally Conrad and Lovell were assigned as backup crew for Gemini 4.
Delays in the production of the Agena target vehicle caused the first rearrangement of the crew rotation. The Schirra and Young mission was bumped to Gemini 6 and they now were the backup crew for Shepard and Stafford. Grissom and Borman now had their long-duration mission assigned to Gemini 5.
The second rearrangement occurred when Shepard developed Ménière's disease, an inner ear problem. Grissom was then moved to command Gemini 3. Slayton felt that Young was a better personality match with Grissom and switched Stafford and Young. Finally, Slayton tapped Cooper to command the long-duration Gemini 5. Again for reasons of compatibility, he moved Conrad from backup commander of Gemini 4 to pilot of Gemini 5, and Borman to backup command of Gemini 4. Finally he assigned Armstrong and Elliot See to be the backup crew for Gemini 5.
The third rearrangement of crew assignment occurred when Slayton felt that See wasn't up to the physical demands of EVA on Gemini 8. He reassigned See to be the prime commander of Gemini 9 and put Scott as pilot of Gemini 8 and Charles Bassett as the pilot of Gemini 9.
The fourth and final rearrangement of the Gemini crew assignment occurred after the deaths of See and Bassett when their trainer jet crashed, ironically into a McDonnell building which held their Gemini 9 capsule in St. Louis. The backup crew of Stafford and Cernan was then moved up to the new prime crew of the re-designated Gemini 9A. Lovell and Aldrin were moved from being the backup crew of Gemini 10 to be the backup crew of Gemini 9. This cleared the way through the crew rotation for Lovell and Aldrin to become the prime crew of Gemini 12.
Along with the deaths of Grissom, White, and Roger Chaffee in the fire of Apollo 1, this final arrangement helped determine the makeup of the first seven Apollo crews, and who would be in position for a chance to be the first to walk on the Moon.
There were 12 Gemini flights, including two unmanned flight tests. All were launched by Titan II rockets. The first unmanned mission was in 1964 the last mission was in 1966. The first spacewalk or extravehicular activity (EVA) by an American was made by Edward White in June 1965. Later same year, the first week-long flight was made with the first use of fuel cells for electrical power. At the end of the year, the first space rendezvous was accomplished with Gemini 6 and 7. In the first half of 1966, the first docking between Gemini 8 and an unmanned vehicle was accomplished too. The highest altitude of the missions was reached by Gemini 11 by 1,190 km. (740 mi.). It was reached by using the Agena propulsion system after docking.
Rendezvous in orbit is not a straight forward maneuver. Should a spacecraft increase its speed to catch up with another, the result would be that it is going to a higher and slower orbit and the distance thereby increases. The right procedure would actually be to slow down and go to a lower orbit first and then later to increase speed and go to the same orbit as the other. To practice these maneuvers special rendezvous and docking simulators were built for the astronauts.
List of missions
Unmanned events Mission LV Serial No Mission Dates Launch Time Duration Remarks Gemini 1 GLV-1 12556 8–12 April 1964 16:01 UTC 03d 23h First test flight of Gemini Gemini 2 GLV-2 12557 19 January 1965 14:03 UTC 00d 00h 18m 16s Suborbital flight to test heat shield Manned events Mission LV Serial No Command Pilot Pilot Mission Dates Launch Time Duration Gemini III GLV-3 12558 Grissom Young 23 March 1965 14:24 UTC 00d 04h 52m 31s First manned Gemini flight, three orbits. Gemini IV GLV-4 12559 McDivitt White 3–7 June 1965 15:15 UTC 04d 01h 56m 12s Included first extravehicular activity (EVA) by an American; White's "space walk" was a 22 minute EVA exercise. Gemini V GLV-5 12560 Cooper Conrad 21–29 August 1965 13:59 UTC 07d 22h 55m 14s First week-long flight; first use of fuel cells for electrical power; evaluated guidance and navigation system for future rendezvous missions. Completed 120 orbits. Gemini VII GLV-7 12562 Borman Lovell 4–18 December 1965 19:30 UTC 13d 18h 35m 01s When the original Gemini VI mission was scrubbed because its Agena target for rendezvous and docking failed, Gemini VII was used for the rendezvous instead. Primary objective was to determine whether humans could live in space for 14 days. Gemini VI-A GLV-6 12561 Schirra Stafford 15–16 December 1965 13:37 UTC 01d 01h 51m 24s First space rendezvous accomplished with Gemini VII, station-keeping for over five hours at distances from 0.3 to 90 m (1 to 300 ft). Gemini VIII GLV-8 12563 Armstrong Scott 16–17 March 1966 16:41 UTC 00d 10h 41m 26s Accomplished first docking with another space vehicle, an unmanned Agena stage. While docked, a Gemini spacecraft thruster malfunction caused near-fatal tumbling of the craft, which, after undocking, Armstrong was able to overcome; the crew effected the first emergency landing of a manned U.S. space mission. Gemini IX-A GLV-9 12564 Stafford Cernan 3–6 June 1966 13:39 UTC 03d 00h 21m 50s Rescheduled from May to rendezvous and dock with augmented target docking adapter (ATDA) after original Agena target vehicle failed to orbit. ATDA shroud did not completely separate, making docking impossible. Three different types of rendezvous, two hours of EVA, and 44 orbits were completed. Gemini X GLV-10 12565 Young Collins 18–21 July 1966 22:20 UTC 02d 22h 46m 39s First use of Agena target vehicle's propulsion systems. Spacecraft also rendezvoused with Gemini VIII target vehicle. Collins had 49 minutes of EVA standing in the hatch and 39 minutes of EVA to retrieve experiment from Agena stage. 43 orbits completed. Gemini XI GLV-11 12566 Conrad Gordon 12–15 September 1966 14:42 UTC 02d 23h 17m 08s Gemini record altitude, 1,189.3 kilometres (739.0 mi) (739.2 mi) reached using Agena propulsion system after first orbit rendezvous and docking. Gordon made 33-minute EVA and two-hour standup EVA. 44 orbits. Gemini XII GLV-12 12567 Lovell Aldrin 11–15 November 1966 20:46 UTC 03d 22h 34m 31s Final Gemini flight. Rendezvoused and docked manually with its target Agena and kept station with it during EVA. Aldrin set an EVA record of 5 hours 30 minutes for one space walk and two stand-up exercises, and demonstrated solutions to previous EVA problems.
Gemini-Titan launches and serial numbers
The Gemini-Titan launch vehicles, like the Mercury-Atlas vehicles before them, were ordered by NASA through the U. S. Air Force and were in reality missiles. The Gemini-Titan II rockets were assigned U.S. Air Force serial numbers, which were painted in four places on each Titan II (on opposite sides on each of the first and second stages). U.S. Air Force crews maintained Launch Complex 19 and prepared and launched all of the Gemini-Titan II launch vehicles.
The USAF serial numbers assigned to the Gemini-Titan launch vehicles are given in the tables above. Fifteen Titan IIs were ordered in 1962 so the serial is "62-12XXX", but only "12XXX" is painted on the Titan II. The order for the last three of the 15 launch vehicles was cancelled on July 30, 1964, and they were never built. Serial numbers were, however, assigned to them prospectively: 12568 - GLV-13; 12569 - GLV-14; and 12570 - GLV-15.
In January 1969, NASA prepared for the US Congress an estimate of the costs for projects Mercury, Gemini, and Apollo (to the first manned Moon landing). This estimate gave the cost of Project Gemini as $1.2834 billion, broken down to $797.4 million for spacecraft, $409.8 million for launch vehicles, and $76.2 million for support.
Current location of hardware
- Gemini 1: Disintegrated (intentionally) upon re-entry to the atmosphere
- Gemini 2: Air Force Space & Missile Museum, Cape Canaveral Air Force Station, Fla.
- Gemini III: Grissom Memorial, Spring Mill State Park, Mitchell, Ind.
- Gemini IV: National Air and Space Museum, Washington D.C.
- Gemini V: Johnson Space Center, NASA, Houston, Texas
- Gemini VI: Oklahoma History Center, Oklahoma City, Okla.
- Gemini VII: Steven F. Udvar-Hazy Center, Chantilly, Va.
- Gemini VIII: Armstrong Air and Space Museum, Wapakoneta, Ohio
- Gemini IX: Kennedy Space Center, NASA, Cape Canaveral, Fla.
- Gemini X: Kansas Cosmosphere and Space Center, Hutchinson, Kan.
- Gemini XI: California Museum of Science and Industry, Los Angeles, Calif.
- Gemini XII: Adler Planetarium, Chicago, Ill.
- Gemini 3A —St. Louis Science Center, St. Louis, Mo.
- Gemini MOL-B —National Museum of the United States Air Force, Wright-Patterson Air Force Base, Dayton, Ohio
- Gemini Trainer —U.S. Space & Rocket Center, Huntsville, Ala.
- Gemini Trainer —Goddard Space Flight Center (Visitor Center), NASA, Greenbelt, Md.
- Gemini Trainer —Louisville Science Center, Louisville, Ken.
- 6165 —National Air and Space Museum, Washington D.C. (not on display)
- El Kabong —Kalamazoo Air Museum, Kalamazoo, Mich.
- Gemini Trainer —Kalamazoo Air Museum, Kalamazoo, Mich.
- TTV-2 Royal Museum, Edinburgh, Scotland
- Trainer —Pate Museum of Transportation, Fort Worth, Texas
- MSC 313 —Private residence, San Jose, Calif.
- Rogallo Test Vehicle —White Sands Space Harbor, White Sands, N. M.
- TTV-1 —Stephen F. Udvar-Hazy Center, Chantilly, Va.
- unnamed —U.S. Air Force Space Museum, Cape Canaveral Air Force Station, Fla.
- unnamed —U.S. Air Force Space Museum, Cape Canaveral Air Force Station, Fla.
- Trainer —U.S. Astronaut Hall of Fame, Titusville, Fla.
- MSC-307 —USS Hornet Museum, Alameda, Calif.
Proposed extensions and applications
McDonnell Aircraft, the main contractor for Mercury and Gemini, was also one of the original bidders on the prime contract for Apollo, but lost out to North American Aviation. McDonnell later sought to extend the Gemini program by proposing a derivative which could be used to fly a cislunar mission and even achieve a manned lunar landing earlier and at less cost than Apollo, but these proposals were rejected by NASA.
A range of applications were considered for Advanced Gemini missions, including military flights, space station crew and logistics delivery, and lunar flights. The Lunar proposals ranged from reusing the docking systems developed for the Agena target vehicle on more powerful upper stages such as the Centaur, which could propel the spacecraft to the Moon, to complete modifications of the Gemini to enable it to land on the Lunar surface. Its applications would have ranged from manned lunar flybys before Apollo was ready, to providing emergency shelters or rescue for stranded Apollo crews, or even replacing the Apollo program.
Some of the Advanced Gemini proposals used "off-the-shelf" Gemini spacecraft, unmodified from the original program, whilst others featured modifications to allow the spacecraft to carry more crew, dock with space stations, visit the Moon, and perform other mission objectives. Other modifications considered included the addition of wings or a parasail to the spacecraft, in order to enable it to make a horizontal landing.
Big Gemini (or "Big G") was another proposal by McDonnell Douglas made in August, 1969. It was intended to provide large-capacity, all-purpose access to space, including missions that ultimately used Apollo or the Space Shuttle.
The study was performed to generate a preliminary definition of a logistic spacecraft derived from Gemini that would be used to resupply an orbiting space station. Land-landing at a preselected site and refurbishment and reuse were design requirements. Two baseline spacecraft were defined: a nine-man minimum modification version of the Gemini B called Min-Mod Big G and a 12-man advanced concept, having the same exterior geometry but with new, state-of-the-art subsystems, called Advanced Big G. Three launch vehicles-Saturn IB, Titan IIIM, and Saturn INT-20 (S-IC/S-IVB) were investigated for use with the spacecraft.
The United States Air Force had an interest in the Gemini system, and decided to use its own modification of the spacecraft as the crew vehicle for the Manned Orbital Laboratory. To this end, one of the unmanned Gemini spacecraft was refurbished and flown again atop a mockup of the MOL, sent into space by a Titan III-M. This was the first time a spacecraft went into space twice.
The USAF also had the notion of adapting the Gemini spacecraft for military applications, such as crude observation of the ground (no specialized reconnaissance camera could be carried) and practising making rendezvous with suspicious satellites. This project was called Blue Gemini. The US Air Force did not like the fact that Gemini would have to be recovered by the US Navy, so they intended for Blue Gemini eventually to use the airfoil and land on three skids, something from the original design of Gemini.
At first some within NASA welcomed sharing of the cost with the USAF, but it was later agreed that NASA was better off operating Project Gemini by itself. Blue Gemini was cancelled in 1963 by Secretary of Defense Robert McNamara, who decided that the NASA Gemini flights could conduct necessary military experiments. MOL was cancelled by Secretary of Defense Melvin Laird in 1969, when it was determined that unmanned spy satellites could perform the same function much more cost-effectively.
- Splashdown (spacecraft landing)
- Timeline of hydrogen technologies
- US space exploration history on US stamps
- ^ The only Gemini spacecraft not on a Titan II was the re-flight of Gemini 2 for a Manned Orbital Laboratory test in 1966, which used a Titan IIIC
- ^ Gemini Program. Venice, CA: Revell, Inc.. 1965. pp. 1. pamphlet included with 1/24 scale model of Gemini spacecraft; based on official records of NASA.
- ^ Farmer, Gene; Dora Jane Hamblin (1970). First On the Moon: A Voyage With Neil Armstrong, Michael Collins and Edwin E. Aldrin, Jr.. Boston: Little, Brown and Co.. pp. 51–54. Library of Congress 76-103950.
- ^ "McDonnell Gemini Spacecraft". http://www.boeing.com/history/mdc/gemini.htm. Retrieved 30 March 2011.
- ^ "Computer, Guidance, Gemini 8". http://www.nasm.si.edu/collections/artifact.cfm?id=A19680264000. Retrieved 23 December 2005.
- ^ "Orbital Rendezvous". Buzz Aldrin. http://buzzaldrin.com/space-vision/rocket_science/orbital-rendezvous/.
- ^ "NASA, Project Gemini". NASA. http://history.nasa.gov/SP-4002/p1b.htm.
- ^ Wilford, John Noble (July 1969). We Reach the Moon. New York: Bantam Books. p. 67.
- Francis French and Colin Burgess, In the Shadow of the Moon: A Challenging Journey to Tranquility, 1965-1969. History of the entire Gemini program.
- Gene Kranz, Failure is Not an Option. Factual, from the standpoint of a chief flight controller during the Mercury, Gemini, and Apollo space programs. ISBN 0-7432-0079-9
- David M. Harland, How NASA Learned to Fly in Space: An Exciting Account of the Gemini Missions, Apogee Books, 2004, ISBN 1-894959-07-8
- David J. Shayler, Gemini, Springer-Verlag Telos, 2001, ISBN 1-85233-405-3
- On the Shoulders of Titans: A History of Project Gemini —(NASA report SP-4203) (PDF format)
- Project Gemini —A Chronology (NASA report SP-4002) (PDF format)
- Gemini Midprogram Conference —Including Experiment Results (NASA report SP-121) —Manned Spacecraft Center —Houston, Texas, February 23-25, 1966
- Gemini Summary Conference (NASA report SP-138) —Manned Spacecraft Center —Houston, Texas, February 1–2, 1967
- On the Shoulders of Titans: A History of Project Gemini by Barton C. Hacker and James M. Grimwood
- John F. Kennedy Space Center —The Gemini Program
- NASA Project Gemini site
- Space history: Gemini Program space history —Gemini missions spaceflight
- Project Gemini Drawings and Technical Diagrams
- Gemini familiarization Manuals (PDF format).
- Gemini Designer Jim Chamberlin Bio
- Direct Flight Apollo Study: Gemini Spacecraft Applications : document on the proposed Gemini-based Apollo program.
- NASA History Series Publications (many of which are on-line)
- Project Gemini McDonnell Employee Video Interviews and Archival Documents: Western Historical Manuscripts Collection in St. Louis, Missouri
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