A payload specialist (PS) is 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.
Payload specialists were generally selected for a single specific mission and were chosen outside the standard NASA astronaut selection process. They were not required to be United States citizens, but had to be approved by NASA and undergo rigorous training. In contrast, a Space Shuttle mission specialist was selected as a NASA astronaut candidate first and then assigned to a mission.
Payload specialists on early missions were technical experts to accompany 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), and to Congressmen and the Teacher in Space program.
Other positions on board Space Shuttle were mission commander, pilot, and mission specialist. Unlike other Shuttle crew, international or scientific payload specialists were generally assigned a back-up who trained alongside the primary payload specialist and would replace him/her in the event of illness or other disability.
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.
NASA's payload specialist program has been criticized for giving limited Shuttle flight positions to civilian aerospace engineers such as Greg Jarvis (killed aboard Challenger), politicians such as US Representative Bill Nelson, and others civilians such as Teacher in Space Christa McAuliffe (also killed aboard Challenger). Even the rationale for the Shuttle flight of former Mercury astronaut and US Senator John Glenn was questioned. The concern was that these people had replaced career astronauts in very limited flight opportunities, and some may have flown without understanding the level of danger.
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 Post 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." 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."
|Ulf Merbold||STS-9||first payload specialists, Ulf Merbold was the first international (German) payload specialist|
|Byron K. Lichtenberg|
|Charles D. Walker||STS-41-D||first non government-affiliated payload specialist|
|Marc Garneau||STS-41-G||Garneau was the first Canadian in space, Scully-Power the first Australian|
|Gary Payton||STS-51-C||first military payload specialist|
|Charles D. Walker||STS-51-D|
|Jake Garn||then-U.S. Senator, first U.S. legislative branch payload specialist|
|Lodewijk van den Berg||STS-51-B|
|Patrick Baudry||STS-51-G||two international payload specialists|
|Sultan bin Salman Al Saud|
|John-David F. Bartoe|
|William A. Pailes||STS-51-J|
|Reinhard Furrer||STS-61-A||three international payload specialists, most payload specialists on a single flight|
|Rodolfo Neri Vela||STS-61-B||first Mexican in space|
|Charles D. Walker||Walker's third and final spaceflight|
|Robert J. Cenker||STS-61-C|
|Bill Nelson||then-U.S. Representative, second and final U.S. legislative branch payload specialist|
|Gregory Jarvis||STS-51-L||killed in the Challenger disaster|
|Samuel T. Durrance||STS-35||first post-Challenger payload specialists|
|Ronald A. Parise|
|F. Drew Gaffney||STS-40|
|Thomas J. Hennen||STS-44|
|Byron K. Lichtenberg||STS-45|
|Dirk Frimout||first Belgian in space|
|Lawrence J. DeLucas||STS-50|
|Eugene H. Trinh|
|Franco Malerba||STS-46||first Italian in space|
|Mamoru Mohri||STS-47||first Japanese astronaut on board Space Shuttle|
|Martin J. Fettman||STS-58|
|Samuel T. Durrance||STS-67|
|Ronald A. Parise|
|Frederick W. Leslie||STS-73|
|Roger K. Crouch||STS-83|
|Gregory T. Linteris|
|Roger K. Crouch||STS-94||mission reflight|
|Gregory T. Linteris|
|Leonid Kadeniuk||STS-87||Ukrainian payload specialist|
|Jay C. Buckey||STS-90||final Spacelab mission|
|James A. Pawelczyk|
|John Glenn||final American payload specialist|
|Ilan Ramon||STS-107||first Israeli in space, final payload specialist, killed in Columbia disaster|
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Robert W. Phillips
George W. Simon, Diane K. Prinz
Joseph M. Prahl, Albert Sacco
David H. Matthiesen, R. Glynn Holt
Alexander W. Dunlap, Chiaki Mukai
|2||Ulf Merbold, Byron K. Lichtenberg, Samuel T. Durrance, Ronald A. Parise, Chiaki Mukai, Roger Crouch, Greg Linteris|
|# of payload specialists flights||Country|
|Total||60 payload specialist flight opportunities|
All were international astronauts.