STS-61-B was the 23rd

NASA The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States ...

Space Shuttle The Space Shuttle is a retired, partially reusable launch system, reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. ...

mission, and its second using Space Shuttle ''

Atlantis Atlantis () is a fictional island mentioned in Plato's works '' Timaeus'' and ''Critias'' as part of an allegory on the hubris of nations. In the story, Atlantis is described as a naval empire that ruled all Western parts of the known world ...

''. The shuttle was launched from

Kennedy Space Center The John F. Kennedy Space Center (KSC, originally known as the NASA Launch Operations Center), located on Merritt Island, Florida, is one of the NASA, National Aeronautics and Space Administration's (NASA) ten NASA facilities#List of field c ...

Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...

, on November 26, 1985. During STS-61-B, the shuttle crew deployed three

communications satellite A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a Transponder (satellite communications), transponder; it creates a communication channel between a source transmitter and a Rad ...

s, and tested techniques of constructing structures in orbit. ''Atlantis'' landed at

Edwards Air Force Base Edwards Air Force Base (AFB) is a United States Air Force installation in California. Most of the base sits in Kern County, California, Kern County, but its eastern end is in San Bernardino County, California, San Bernardino County and a souther ...

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

, at 16:33:49 EST on December 3, 1985, after 6 days, 21 hours, 4 minutes, and 49 seconds in orbit. STS-61-B marked the quickest turnaround of a Shuttle orbiter from launch to launch in history – just 54 days elapsed between ''Atlantis'' launch on

STS-51-J STS-51-J was NASA's 21st Space Shuttle mission and the maiden flight of Space Shuttle ''Atlantis''. It launched from Kennedy Space Center, Florida, on October 3, 1985, carrying a payload for the U.S. Department of Defense (DoD), and landed at ...

and launch on STS-61-B. , this is still the record for turn around between two flights of the same orbital space vehicle. The mission was also notable for carrying the first

Mexican Mexican may refer to: Mexico and its culture *Being related to, from, or connected to the country of Mexico, in North America ** People *** Mexicans, inhabitants of the country Mexico and their descendants *** Mexica, ancient indigenous people ...

astronaut,

Rodolfo Neri Vela Rodolfo Neri Vela (born 19 February 1952) is a Mexican scientist and astronaut who flew aboard a NASA Space Shuttle mission in the year 1985. He is the second Latin American to have traveled to space after Cuban cosmonaut Arnaldo Tamayo Méndez. ...

. This was also ''Atlantis'' second and final mission before the Space Shuttle ''Challenger'' disaster in 1986. The Challenger disaster would ground the shuttle fleet for two and a half years and ''Atlantis'' would not fly again until

STS-27 STS-27 was the 27th NASA Space Shuttle program, Space Shuttle mission, and the third flight of Space Shuttle Atlantis, Space Shuttle ''Atlantis''. Launching on December 2, 1988, on a four-day mission, it was the second shuttle flight after the ...

, which launched three years later on December 2, 1988.

Crew

Backup crew

Crew seat assignments

Shuttle processing

After landing at the Edwards Air Force Base at the end of STS-51-J on October 7, 1985, ''Atlantis'' returned to the Kennedy Space Center on October 12, 1985. The shuttle was moved directly into an

Orbiter Processing Facility Orbiter Processing Facility (OPF) is a class of hangars where U.S. Space Shuttle orbiters underwent maintenance between flights. They are located west of the Vehicle Assembly Building, where the orbiter was mated with its external tank and Space ...

(OPF), where post-flight de-servicing and pre-flight processing took place simultaneously. After only 26 days in the OPF, a record fast processing in the history of the Space Shuttle program, the shuttle was rolled to the

Vehicle Assembly Building The Vehicle Assembly Building (originally the Vertical Assembly Building), or VAB, is a large building at NASA's Kennedy Space Center (KSC) in Florida, designed to assemble large pre-manufactured space vehicle components, such as the massive Satu ...

(VAB) on November 7, 1985. ''Atlantis'' was mated with the

External Tank The Space Shuttle external tank (ET) was the component of the Space Shuttle launch vehicle that contained the liquid hydrogen Rocket propellant, fuel and liquid oxygen oxidizer. During lift-off and ascent it supplied the fuel and oxidizer und ...

(ET) and

Solid Rocket Booster A solid rocket booster (SRB) is a solid propellant motor used to provide thrust in spacecraft launches from initial launch through the first ascent. Many launch vehicles, including the Atlas V, SLS and Space Shuttle, have used SRBs to give laun ...

(SRB) stack and was rolled out to launch

LC-39A Launch Complex 39A (LC-39A) is the first of Kennedy Space Center Launch Complex 39, Launch Complex 39's three launch pads, located at NASA's Kennedy Space Center in Merritt Island, Florida. The pad, along with Launch Complex 39B, was built in t ...

on November 12, 1985.

Payload

Three satellites were deployed during this mission:

Aussat-2 This is a list of the satellites operated by Optus, an Australian telecommunications company. The satellite communications facility is located at Belrose on Sydney's Northern Beaches. Optus' satellites are divided into 4 classes A, B, C and D. As ...

, Morelos-2, and Satcom-K2. Aussat-2 and Morelos-2 were the second satellites in their series (the first satellites in the series were deployed during

STS-51-G STS-51-G was the 18th flight of NASA's Space Shuttle program, and the fifth flight of Space Shuttle ''Discovery''. The seven-day mission launched from Kennedy Space Center, Florida, on June 17, 1985, and landed at Edwards Air Force Base, Calif ...

and

STS-51-I STS-51-I was the 20th mission of NASA's Space Shuttle program and the sixth flight of Space Shuttle ''Discovery''. During the mission, ''Discovery'' deployed three communications satellites into orbit. The mission launched from Kennedy Space ...

). Both of these were

Hughes Space and Communications The Hughes Aircraft Company was a major American aerospace and defense contractor founded on February 14, 1934 by Howard Hughes in Glendale, California, as a division of the Hughes Tool Company. The company produced the Hughes H-4 Hercules aircr ...

HS-376 The Boeing 376 (sometimes referred to as the BSS-376, and previously as the HS-376) is a communications satellite bus introduced in 1978 by Hughes Space and Communications Company. It was a spin-stabilized bus, a successor to Hughes HS-333. ...

satellites and were equipped with a

Payload Assist Module The Payload Assist Module (PAM) is a modular upper stage designed and built by McDonnell Douglas (Boeing), using Thiokol Star-series solid propellant rocket motors. The PAM was used with the Space Shuttle, Delta, and Titan launchers and carried ...

(PAM-D) booster to reach

geostationary transfer orbit In space mission design, a geostationary transfer orbit (GTO) or geosynchronous transfer orbit is a highly elliptical type of geocentric orbit, usually with a perigee as low as low Earth orbit (LEO) and an apogee as high as geostationary orbit ...

(GTO). Satcom-K2 was a version of the RCA 4000 series satellites, which were owned and operated by

RCA American Communications SES Americom was a major commercial satellite operator of North American geosynchronous satellites based in the United States. The company started as RCA Americom in 1975 before being bought by General Electric in 1986 and then later acquired b ...

(RCA). This satellite was deployed using a PAM-D2 booster (which was a larger version of the PAM-D). This was the first flight of the PAM-D2 booster on a Space Shuttle. All three satellites were successfully deployed, one at a time, and their booster stages fired automatically to lift them to geostationary transfer orbits. Their respective owners assumed charge, and later fired the onboard kick motors at

apogee An apsis (; ) is the farthest or nearest point in the orbit of a planetary body about its primary body. The line of apsides (also called apse line, or major axis of the orbit) is the line connecting the two extreme values. Apsides perta ...

, to circularize the orbits and align them with the

equator The equator is the circle of latitude that divides Earth into the Northern Hemisphere, Northern and Southern Hemisphere, Southern Hemispheres of Earth, hemispheres. It is an imaginary line located at 0 degrees latitude, about in circumferen ...

Middeck payloads

* Continuous Flow Electrophoresis System (CFES) * Diffusive Mixing of Organic Solutions (DMOS) * Morelos Payload Specialist Experiments (MPSE) and Orbiter Experiments (OEX)

Other items

A checkered racing flag was carried on board ''Atlantis'' during STS-61-B; the flag is now on display at the

Indianapolis Motor Speedway Hall of Fame Museum The Indianapolis Motor Speedway Museum is an automotive museum on the grounds of the Indianapolis Motor Speedway in Speedway, Indiana, United States, which houses the Indianapolis Motor Speedway Hall of Fame. It is intrinsically linked to the Ind ...

. This was also the second test flight of the Orbiter Experiments (OEX) advanced autopilot. It ran for approximately 65 hours and demonstrated the ability to fly the orbiter on nose jets only, aft jets only, to automatically stationkeep on another satellite and to fly an orbit with zero aerodynamic drag. The OEX autopilot was also more fuel efficient than the baseline system.

Mission summary

Space Shuttle ''Atlantis'' lifted off from Launch Complex 39A at Kennedy Space Center at 19:29:00 p.m. EST on November 26, 1985. The launch marked the second night launch of the Space Shuttle program, and the ninth and final flight of 1985. A key element of the mission's objectives was

EASE/ACCESS The Experimental Assembly of Structures in EVA and the Assembly Concept for Construction of Erectable Space Structures, or EASE/ACCESS, were a pair of space shuttle flight experiments that were performed on STS-61-B, on November 29 and December ...

, an experiment in assembling large structures in space. EASE/ACCESS was a joint venture between the

Langley Research Center The Langley Research Center (LaRC or NASA Langley), located in Hampton, Virginia, near the Chesapeake Bay front of Langley Air Force Base, is the oldest of NASA's field centers. LaRC has focused primarily on aeronautical research but has also ...

(LRC) and the

Marshall Space Flight Center Marshall Space Flight Center (officially the George C. Marshall Space Flight Center; MSFC), located in Redstone Arsenal, Alabama (Huntsville, Alabama, Huntsville postal address), is the Federal government of the United States, U.S. government's ...

(MSFC). ACCESS was a "high-rise" tower composed of many small struts and nodes. EASE was a geometric structure shaped like an inverted

pyramid A pyramid () is a structure whose visible surfaces are triangular in broad outline and converge toward the top, making the appearance roughly a pyramid in the geometric sense. The base of a pyramid can be of any polygon shape, such as trian ...

, that was composed of a few large beams and nodes. Together, these experiments demonstrated the feasibility of assembling large preformed structures in space. Astronauts Ross and Spring performed two

spacewalks Extravehicular activity (EVA) is any activity done by an astronaut in outer space outside a spacecraft. In the absence of a breathable atmosphere of Earth, Earthlike atmosphere, the astronaut is completely reliant on a space suit for environme ...

on the mission, which marked the 50th, and 51st

extravehicular activity Extravehicular activity (EVA) is any activity done by an astronaut in outer space outside a spacecraft. In the absence of a breathable atmosphere of Earth, Earthlike atmosphere, the astronaut is completely reliant on a space suit for environme ...

(EVAs) for the United States, and the 12th and the 13th for the Shuttle program. An

IMAX IMAX is a proprietary system of High-definition video, high-resolution cameras, film formats, film projectors, and movie theater, theaters known for having very large screens with a tall aspect ratio (image), aspect ratio (approximately ei ...

camera mounted in the cargo bay filmed the activities of the astronauts engaged in the EASE/ACCESS work, as well as other scenes of interest. "This is probably not the preferred way of building a space station", Ross said later of EASE. The astronauts reported that the most difficult part of the spacewalks was torquing their own masses while holding the EASE beams. They found that ACCESS worked well, while EASE required too much free floating. The astronauts judged that performing six-hour spacewalks every other day over a five or six-day period was feasible, and recommended glove changes to reduce hand fatigue. Ross said in the EVA debrief that the crew had tried to have the

Manned Maneuvering Unit The Manned Maneuvering Unit (MMU) is an astronaut propulsion unit that was used by NASA on three Space Shuttle missions in 1984. The MMU allowed the astronauts to perform untethered Extravehicular activity, extravehicular spacewalks at a dist ...

(MMU) manifested for use in the second spacewalk, because "for certain applications it would be very useful. In particular if you were building portions of a space station attached to the orbiter, then moving those portions farther than the manipulator arm could transport them". He added that the MMU could be used to attach cable runs and instruments in places that were out of reach of the shuttle's robotic arm (

Canadarm Canadarm or Canadarm1 (officially Shuttle Remote Manipulator System or SRMS, also SSRMS) is a series of robotic arms that were used on the Space Shuttle orbiters to deploy, manoeuvre, and capture payloads. After the Space Shuttle ''Columbia' ...

). During the mission astronaut Rodolfo Neri Vela accomplished a series of experiments, that were primarily related to

human physiology The human body is the entire structure of a human being. It is composed of many different types of cells that together create tissues and subsequently organs and then organ systems. The external human body consists of a head, hair, neck, ...

. He also photographed

Mexico Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...

and

Mexico City Mexico City is the capital city, capital and List of cities in Mexico, largest city of Mexico, as well as the List of North American cities by population, most populous city in North America. It is one of the most important cultural and finan ...

as part of the mission's

Earth observation Earth observation (EO) is the gathering of information about the physical, chemical, and biosphere, biological systems of the planet Earth. It can be performed via remote sensing, remote-sensing technologies (Earth observation satellites) or throu ...

s. However, Commander Brewster Shaw installed a padlock on the hatch control because he was "particularly concerned" that the Mexican could "flip out" during the mission. Shaw had noted that he didn't think that Neri Vela noticed the padlock, but that the other members of the crew did. Astronaut Charles Walker again operated the Continuous Flow Electrophoresis System (CFES), the third flight of this larger and improved equipment, to produce commercial

pharmaceutical Medication (also called medicament, medicine, pharmaceutical drug, medicinal product, medicinal drug or simply drug) is a drug used to diagnose, cure, treat, or prevent disease. Drug therapy ( pharmacotherapy) is an important part of the ...

products in

microgravity Weightlessness is the complete or near-complete absence of the sensation of weight, i.e., zero apparent weight. It is also termed zero g-force, or zero-g (named after the g-force) or, incorrectly, zero gravity. Weight is a measurement of the fo ...

. An experiment in Diffusive Mixing of Organic Solutions (DMOS), was conducted successfully for 3M. The object of this experiment was to grow single

crystal A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macros ...

s that were larger and more pure than any that could be grown on

Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...

. One

Getaway Special Getaway Special was a NASA program that offered interested individuals, or groups, opportunities to fly small experiments aboard the Space Shuttle. Over the 20-year history of the program, over 170 individual missions were flown. The program, whi ...

(GAS) canister stored in ''Atlantis''s payload bay carried a

Canadian Canadians () are people identified with the country of Canada. This connection may be residential, legal, historical or cultural. For most Canadians, many (or all) of these connections exist and are collectively the source of their being ''C ...

student experiment, which involved the fabrication of mirrors in microgravity with higher performance than ones made on Earth. All the experiments on this mission were successfully accomplished, and all equipment operated within established parameters. ''Atlantis'' landed safely at Edwards Air Force Base at 16:33:49 EST on December 3, 1985, after a mission lasting 6 days, 21 hours, 4 minutes, 49 seconds. Atlantis landed one orbit earlier than planned due to lighting concerns at the Edwards. Rollout distance on landing was lasting 78 seconds. File:STS-61-B Morelos-B deployment.jpg, Deployment of the Morelos-2 satellite File:STS61B-21-008.jpg, STS-61-B crew portrait in-flight on the aft flight deck File:Atlantis lands at the end of STS-61B.jpg, Atlantis touches down at the lakebed runway at Edwards Air Force Base.

Spacewalks

Two spacewalks were conducted during the STS-61-B mission to demonstrate assembly techniques which might be used in space station assembly.

Wake-up calls

NASA began a tradition of playing music to astronauts during the

Project Gemini Project Gemini () was the second United States human spaceflight program to fly. Conducted after the first American crewed space program, Project Mercury, while the Apollo program was still in early development, Gemini was conceived in 1961 and ...

, and first used music to wake up a flight crew during

Apollo 15 Apollo 15 (July 26August 7, 1971) was the ninth crewed mission in the Apollo program and the fourth Moon landing. It was the first List of Apollo missions#Alphabetical mission types, J mission, with a longer stay on the Moon and a greate ...

. Each track is specially chosen, often by the astronauts' families, and usually has a special meaning to an individual member of the crew, or is applicable to their daily activities.

References

External links

STS-61B Video Highlights
{{Orbital launches in 1985 Space Shuttle missions Edwards Air Force Base 1985 in spaceflight Spacecraft launched in 1985