A payload specialist (PS) was an individual selected and trained by commercial or research organizations for flights of a specific payload on a NASA Space Shuttle mission. People assigned as payload specialists included individuals selected by the research community, a company or consortium flying a commercial payload aboard the spacecraft, and non-NASA astronauts designated by international partners.
The term refers to both the individual and to the position on the Shuttle crew.
The National Aeronautics and Space Act of 1958 states that NASA should provide the "widest practicable and appropriate dissemination of information concerning its activities and the results thereof". The Naugle panel of 1982 concluded that carrying civilians—those not part of the NASA Astronaut Corps—on the Space Shuttle was part of "the purpose of adding to the public's understanding of space flight". [1]
Payload specialists usually fly for a single specific mission. Chosen outside the standard NASA mission specialist selection process, they are exempt from certain NASA requirements such as colorblindness. Roger Crouch [2] and Ulf Merbold are examples of those who flew in space despite not meeting NASA physical requirements; [3] : 63 the agency's director of crew training Jim Bilodeau said in April 1981 "we'll be able to take everybody but the walking wounded". [4] Payload specialists were not required to be United States citizens, but had to be approved by NASA and undergo rigorous but shorter training. In contrast, a Space Shuttle mission specialist was selected as a NASA astronaut first and then assigned to a mission.
Payload specialists on early missions were technical experts to join specific payloads such as a commercial or scientific satellite. On Spacelab and other missions with science components, payload specialists were scientists with expertise in specific experiments. The term also applied to representatives from partner nations who were given the opportunity of a first flight on board of the Space Shuttle (such as Saudi Arabia and Mexico), to Congressmen and the Teacher in Space program. Under Secretary of the Air Force Edward C. Aldridge Jr. was offered a seat to improve relations between NASA and the United States Air Force.
NASA expected to also fly "citizen astronauts", ordinary Americans who could describe space to others. In August 1984 President Ronald Reagan announced the Teacher in Space Project, the first such program. NASA expected to fly reporters (Journalist in Space Project), entertainers, and creative types later. [5]
NASA categorized full-time international astronauts as payload specialists unless they received NASA mission specialist training, which some did. [3] : 63 Bilodeau estimated that payload specialists would receive a couple of hundred hours of training over four or five weeks. [4] International or scientific payload specialists were generally assigned a back-up who trained alongside the primary payload specialist and would replace them in the event of illness or other disability. Both primary and backup payload specialists received mission-specific and general training. Michael Lampton estimated that about 20% of his training was general, including firefighter school, capsule communicator duty, and use of Personal Egress Air Packs and the space toilet. He described training for Spacelab 1 as "going back to graduate school but majoring in everything"; as the first mission it tested Spacelab's versatility in "medical, metallurgical, remote sensing, astronomy, microgravity, lots more". [3] : 59–60
Payload specialists operated experiments, and participated in experiments needing human subjects. Charles D. Walker recalled that Senator Jake Garn "and I were the obvious subjects" for Rhea Seddon's echocardiograph on STS-51-D. "We really didn’t have much of a choice in whether we were going to be subjects or not. 'You're a payload specialist; you’re going to be a subject.'" Besides his own electrophoresis work, Walker operated an unrelated experiment for the University of Alabama Birmingham, and helped build homemade repair tools for a satellite launched on the mission. [6]
Payload specialists were flown from 1983 (STS-9) to 2003 (STS-107). The last flown payload specialist was the first Israeli astronaut, Ilan Ramon, who was killed in the Columbia disaster on mission STS-107 with the rest of the crew.
Within NASA, Johnson Space Center (JSC) controlled crewed spaceflight by selecting professional, full-time astronauts. The payload specialist program gave Marshall Space Flight Center (MSFC)—which supervised Spacelab, including a contracted European Space Agency-chosen payload specialist—control as well, causing conflicts. JSC director Chris Kraft and members of the NASA astronaut corps believed that mission specialists—many with doctoral degrees or other scientific background, and all with full-time astronaut training—could operate all experiments. Rick Chappell, chief scientist of MSFC, believed that the scientific community insisted on its own scientists being able to operate experiments in exchange for support of the Space Shuttle program. While mission specialists could operate most experiments, "Since we could take passengers, why not take at least a couple of passengers who had spent their whole careers doing the kind of research they were going to do in space?" he said. [3] : 9–10, 15, 18, 28–29, 48
During the Space Shuttle design process, some said that crews should be no larger than four people; both for safety, and because a commander, pilot, mission specialist, and payload specialist were sufficient for any mission. NASA expected to fly more payload specialists so it designed a larger vehicle. [1] Only NASA astronauts piloted the space shuttle, but mission specialist astronauts worried about competing with American and international payload specialists for very limited flight opportunities. In 1984 about 45 mission specialists competed for about 15 seats on the five shuttle flights. Only three payload specialists flew that year, but in 1985 eight of nine shuttle flights carried 15 payload specialists (Walker flying twice), no doubt angering mission specialists. Some payload specialists like Walker and Byron Lichtenberg were rejected as full-time astronauts but flew as payload specialists before many selected as such, and some may have flown without understanding the level of danger. Many astronauts worried that without years of training together they would not be able to trust payload specialists in an emergency; Henry Hartsfield described their concern as "If you had a problem on orbit, am I going to have to babysit this person?" NASA's preference for its own training caused the agency to offer some international payload specialists the opportunity to become mission specialists, the first being Claude Nicollier. [3] : 40–44, 48–50, 61–63
Those skeptical of the payload specialist program were less critical of scientists and experts like Walker than non-expert passengers ("part-timers", according to Mike Mullane, who called the program public relations-driven and immoral in Riding Rockets ) like Garn, US Representative Bill Nelson, and other civilians such as Teacher in Space Christa McAuliffe. They saw Senator John Glenn as a passenger despite being a former Mercury Seven astronaut. [3] : 40, 51 [7] A 1986 post-Challenger article in The Washington Post reviewed the issue, reporting that as far back as 1982, NASA was concerned with finding reasonable justifications for flying civilians on the Shuttle as was directed by the Reagan administration. The article says that "A review of records and interviews with past and present NASA and government officials shows the civilian program's controversial background, with different groups pushing for different approaches". [1] The article concludes with:
Author Tom Wolfe, who chronicled the early days of the space program in The Right Stuff, wrote after the Challenger explosion that support for the citizen program, and therefore McAuliffe's place aboard the ill-fated shuttle, was part of an insiders' battle. NASA civilians, pitting themselves against the professional astronauts, used the program for the "dismantling of Astropower," which Wolfe described as "the political grip the original breed of fighter-pilot test-pilot astronauts had on NASA." [1]
Payload specialists were aware of full-time astronauts' dislike of the program. Garn advised STS-51-D colleague Jeffrey A. Hoffman to not play poker because, the astronaut quoted, "'It took you a while to disguise your initial skepticism about this whole thing'". Merbold said that at JSC he was treated as an intruder. Once payload specialists were assigned to a mission, however, full-time astronauts treated them respectfully and often began long-term friendships. Mullane became less critical of them after his first mission; he and Hartsfield approved of Walker, as did Hoffman of Garn after STS-51-D. [3] : 40, 48, 50–52
The following list are people who were named as backup (also known as alternate) payload specialists. These people typically received the same training as the "prime" crew payload specialist, but did not fly on the mission. However, many would go on to fly on other missions as "prime" crew payload or mission specialists.
Payload specialist | Mission | Notes |
---|---|---|
Wubbo Ockels | STS-9 | flew on STS-61-A |
Michael Lampton | ||
Robert Thirsk | STS-41-G | flew on STS-78 |
Robert E. Stevenson | ||
Keith Wright | STS-51-C | |
Mary Johnston | STS-51-B | |
Eugene H. Trinh | flew on STS-50 | |
Jean-Loup Chrétien | STS-51-G | flew on STS-86 as a mission specialist |
Abdulmohsen Al-Bassam | ||
George W. Simon | STS-51-F | |
Dianne K. Prinz | ||
Ulf Merbold | STS-61-A | flew on STS-9, STS-42 |
Barbara Morgan | STS-51-L | flew on STS-118 as a mission specialist |
Robert W. Phillips | STS-40 | |
Michael Lampton | STS-45 | |
Charles R. Chappell | ||
Joseph M. Prahl | STS-50 | |
Albert Sacco | flew on STS-73 | |
Jean-Jacques Favier | STS-65 | flew on STS-78 |
David H. Matthiesen | STS-73 | |
R. Glynn Holt | ||
Pedro Duque | STS-78 | flew on STS-95 as a mission specialist |
Luca Urbani | ||
Alan Johnston | STS-83 | |
Paul Ronney | ||
Alan Johnston | STS-94 | |
Paul Ronney | ||
Yaroslav Pustovyi [8] | STS-87 | |
Alexander W. Dunlap | STS-90 | |
Chiaki Mukai | flew on STS-65, STS-95 | |
Flights | Payload specialist |
---|---|
3 | Charles Walker |
2 | Ulf Merbold, Byron K. Lichtenberg, Samuel T. Durrance, Ronald A. Parise, Chiaki Mukai, Roger Crouch, Greg Linteris |
Flights | Country |
---|---|
36 | United States |
6 | Germany [lower-alpha 1] |
5 | Canada |
3 | Japan |
2 | France |
Italy | |
1 | Saudi Arabia |
Netherlands | |
Mexico | |
Belgium | |
Ukraine | |
Israel |
All were international astronauts.
STS-9 was the ninth NASA Space Shuttle mission and the sixth mission of the Space Shuttle Columbia. Launched on November 28, 1983, the ten-day mission carried the first Spacelab laboratory module into orbit.
Ulf Dietrich Merbold is a German physicist and astronaut who flew to space three times, becoming the first West German citizen in space and the first non-American to fly on a NASA spacecraft. Merbold flew on two Space Shuttle missions and on a Russian mission to the space station Mir, spending a total of 49 days in space.
STS-51-B was the 17th flight of the NASA Space Shuttle program and the seventh flight of Space Shuttle Challenger. The launch of Challenger on April 29, 1985, was delayed by 2 minutes and 18 seconds, due to a launch processing failure. Challenger was initially rolled out to the pad to launch on the STS-51-E mission. The shuttle was rolled back when a timing issue emerged with the TDRS-B satellite. When STS-51-E was canceled, Challenger was remanifested with the STS-51-B payloads. The shuttle landed successfully on May 6, 1985, after a week-long mission.
STS-61-A was the 22nd mission of NASA's Space Shuttle program. It was a scientific Spacelab mission, funded and directed by West Germany – hence the non-NASA designation of D-1. STS-61-A was the ninth and last successful flight of Space Shuttle Challenger before the disaster. STS-61-A holds the current record for the largest crew—eight people—aboard any single spacecraft for the entire period from launch to landing.
STS-35 was the tenth flight of Space Shuttle Columbia, the 38th shuttle mission. It was devoted to astronomical observations with ASTRO-1, a Spacelab observatory consisting of four telescopes. The mission launched from Kennedy Space Center in Florida on December 2, 1990.
STS-42 was a NASA Space Shuttle Discovery mission with the Spacelab module. Liftoff was originally scheduled for 8:45 EST on January 22, 1992, but the launch was delayed due to weather constraints. Discovery successfully lifted off an hour later at 9:52:33 EST. The main goal of the mission was to study the effects of microgravity on a variety of organisms. The shuttle landed at 8:07:17 PST on January 30, 1992, on Runway 22, Edwards Air Force Base, California. STS-42 was the first of two flights in 1992 of Discovery, the second of which occurred during STS-53, which launched on December 2, 1992. The mission was also the last mission of the Space Shuttle Discovery to have a seven-member crew until STS-82, which was launched on February 11, 1997.
STS-47 was NASA's 50th Space Shuttle mission of the program, as well as the second mission of the Space Shuttle Endeavour. The mission mainly involved conducting experiments in life and material sciences inside Spacelab-J, a collaborative laboratory inside the shuttle's payload bay sponsored by NASA and the National Space Development Agency of Japan (NASDA). This mission carried Mamoru Mohri, the first Japanese astronaut aboard the shuttle, Mae Jemison, the first African-American woman to go to space, and the only married couple to fly together on the shuttle, Mark C. Lee and Jan Davis, which had been against NASA policy prior to this mission.
Henry Warren Hartsfield Jr. was a United States Air Force Colonel and NASA astronaut who logged over 480 hours in space. He was inducted into the United States Astronaut Hall of Fame in 2006.
Richard Michael Mullane is an engineer and weapon systems officer, a retired USAF officer, and a former NASA astronaut. During his career, he flew as a mission specialist on STS-41-D, STS-27, and STS-36.
Charles David "Charlie" Walker is an American engineer and astronaut who flew on three Space Shuttle missions in 1984 and 1985 as a Payload Specialist for the McDonnell Douglas Corporation.
Shannon Matilda Wells Lucid is an American biochemist and retired NASA astronaut. She has flown in space five times, including a prolonged mission aboard the Russian space station Mir in 1996, and is the only American woman to have stayed on Mir. From 1996 to 2007, Lucid held the record for the longest duration spent in space by an American and by a woman. She was awarded the Congressional Space Medal of Honor in December 1996, making her the tenth person and the first woman to be accorded the honor.
STS-58 was a NASA mission flown by Space Shuttle Columbia launched from Kennedy Space Center, Florida, on October 18, 1993. The missions was primarily devoted to experiments concerning the physiological effects in space. This was the first in-flight use of the "Portable In-flight Landing Operations Trainer" (PILOT) simulation software. It was also the last time Columbia would land at Edwards Air Force Base, California.
STS-83 was a NASA Space Shuttle mission flown by Columbia. It was a science research mission that achieved orbit successfully, but the planned duration was a failure due to a technical problem with a fuel cell that resulted in the abort of the 15 day duration. Columbia returned to Earth just shy of four days. The mission was re-flown as STS-94 with the same crew later that year.
Margaret Rhea Seddon is an American surgeon and retired NASA astronaut. After being selected as part of the first group of astronauts to include women in 1978, she flew on three Space Shuttle flights: as a mission specialist on STS-51-D and STS-40, and as a payload commander for STS-58, accumulating over 722 hours in space. On these flights, she built repair tools for a US Navy satellite and performed medical experiments.
Edwin Jacob "Jake" Garn is an American politician and member of the Republican Party who served as a member of the United States Senate representing Utah from 1974 to 1993. Garn became the first sitting member of the United States Congress to fly in space when he flew aboard the Space Shuttle Discovery as a payload specialist during NASA mission STS-51-D.
Wubbo Johannes Ockels was a Dutch physicist and astronaut with the European Space Agency who, in 1985, became the first Dutch citizen in space when he flew on STS-61-A as a payload specialist. He later became professor of aerospace engineering at Delft University of Technology.
The European Astronaut Corps is a unit of the European Space Agency (ESA) that selects, trains, and provides astronauts as crew members on U.S. and Russian space missions. The corps has 13 active members, able to serve on the International Space Station (ISS). The European Astronaut Corps is based at the European Astronaut Centre in Cologne, Germany. They can be assigned to various projects both in Europe or elsewhere in the world, at NASA Johnson Space Center or Star City.
Spaceflight participant is the term used by NASA, Roscosmos, and the Federal Aviation Administration (FAA) for people who travel into space, but are not professional astronauts.
NASA Astronaut Group 9 was a group of 19 NASA astronauts announced on May 29, 1980, and completed their training by 1981. This group was selected to supplement the 35 astronauts that had been selected in 1978, and marked the first time that non-Americans were trained as mission specialists with the selections of ESA astronauts Claude Nicollier and Wubbo Ockels. In keeping with the previous group, astronaut candidates were divided into pilots and mission specialists, with eight pilots, eleven mission specialists, and two international mission specialists within the group.
Mary Helen Johnston, later also Mary Helen McCay, is an American scientist and former astronaut. Working with NASA as an engineer in the 1960s and '70s, Johnston aspired to be an astronaut; she unsuccessfully applied in 1980 before becoming a payload specialist in 1983. Johnston retired from NASA in 1986 without having gone to space. She is a professor at Florida Institute of Technology.