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Spacecraft

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"Spaceship" redirects here. For other uses, see Spaceship (disambiguation).
More than 100 Russian Soyuz manned spacecraft (TMA version shown) have flown since 1967, originally for a Soviet manned lunar program, but currently supporting the International Space Station.
The US Space Shuttle flew 135 times from 1981 to 2011, supporting Spacelab, Mir, and ISS. (Columbia's first launch shown)

A spacecraft or spaceship is a craft or machine designed for spaceflight. Spacecraft are used for a variety of purposes, including communications, earth observation, meteorology, navigation, planetary exploration and transportation of humans and cargo.

On a sub-orbital spaceflight, a spacecraft enters space and then returns to the surface, without having gone into an orbit. For orbital spaceflights, spacecraft enter closed orbits around the Earth or around other celestial bodies. Spacecraft used for human spaceflight carry people on board as crew or passengers from start or on orbit (space stations) only, while those used for robotic space missions operate either autonomously or telerobotically. Robotic spacecraft used to support scientific research are space probes. Robotic spacecraft that remain in orbit around a planetary body are artificial satellites. Only a handful of interstellar probes, such as Pioneer 10 and 11, Voyager 1 and 2, and New Horizons, are currently on trajectories that leave our Solar System.

Orbital spacecraft may be recoverable or not. By method of reentry to Earth they may be divided in non-winged space capsules and winged spaceplanes.

Currently, only a few nations have spaceflight technology: Russia (Russian Federal Space Agency), the United States (NASA and private industry), the European Union (European Space Agency), the People's Republic of China (China National Space Administration), Japan (Japan Aerospace Exploration Agency), and India (Indian Space Research Organisation). As of 2011, only the US, Russia and China have demonstrated human spaceflight capability.

Spacecraft (spaceship) and space travel are common themes in works of science fiction.

History

See also: History of spaceflight

The first Earth orbiting satellite was Sputnik 1, which was launched 4 October 1957, and remained in orbit for several months.[1] While Sputnik 1 was the first spacecraft to orbit the Earth, other man-made objects had previously reached an altitude of 100 km, which is the height required by the international organization Fédération Aéronautique Internationale to count as a spaceflight. This altitude is called the Kármán line. In particular, in the 1940s there were several test launches of the V-2 rocket, some of which reached altitudes well over 100 km.

Past and present spacecraft

Manned spacecraft

See also: List of manned spacecraft and Human spaceflight
The Apollo 15 Command/Service Module as viewed from the Lunar Module on August 2, 1971. Used on 16 manned missions

As of 2011, only three nations have flown manned spacecraft: USSR/Russia, USA, and China. India, Japan, Europe/ESA, Iran, DPRK, Denmark, and Romania have plans for manned spacecraft (for manned suborbital rockets).[citation needed]

The first manned spacecraft was Vostok 1, which carried Soviet cosmonaut Yuri Gagarin into space in 1961, and completed a full Earth orbit. There were five other manned missions which used a Vostok spacecraft.[2] The second manned spacecraft was named Freedom 7, and it performed a sub-orbital spaceflight in 1961 carrying American astronaut Alan Shepard to an altitude of just over 187 kilometres (116 mi). There were five other manned missions using Mercury spacecraft.

Other Soviet manned spacecraft include the Voskhod, Soyuz, unflown as manned Zond/L1, L3, TKS, and the Salyut and Mir manned space stations. Other American manned spacecraft include the Gemini Spacecraft, Apollo Spacecraft, the Skylab space station, and the Space Shuttle with undetached European Spacelab and private US Spacehab space stations-modules. China developed unflown Shuguang and currently using Shenzhou (the first manned mission was in 2003).

All of these recovery manned spacecraft were space capsules.

The International Space Station, manned since November 2000, is a joint venture between Russia, the United States, and several other countries.

Spaceplanes

Main article: Spaceplane
Columbia orbiter landing

Some reusable vehicles have been designed only for manned spaceflight, and these are often called spaceplanes. The first example of such was the North American X-15 spaceplane, which conducted two manned flights which reached a height over 100 km in the 1960s. The first reusable spacecraft, the X-15, was air-launched on a suborbital trajectory on July 19, 1963.

The first partially reusable orbital spacecraft, winged non-capsule, the Space Shuttle, was launched by the USA on the 20th anniversary of Yuri Gagarin's flight, on April 12, 1981. During the Shuttle era, six orbiters were built, all of which have flown in the atmosphere and five of which have flown in space. The Enterprise was used only for approach and landing tests, launching from the back of a Boeing 747 SCA and gliding to deadstick landings at Edwards AFB, California. The first Space Shuttle to fly into space was the Columbia, followed by the Challenger, Discovery, Atlantis, and Endeavour. The Endeavour was built to replace the Challenger when it was lost in January 1986. The Columbia broke up during reentry in February 2003.

The first automatic partially reusable spacecraft was the Buran (Snowstorm), launched by the USSR on November 15, 1988, although it made only one flight. This spaceplane was designed for a crew and strongly resembled the U.S. Space Shuttle, although its drop-off boosters used liquid propellants and its main engines were located at the base of what would be the external tank in the American Shuttle. Lack of funding, complicated by the dissolution of the USSR, prevented any further flights of Buran. The Space Shuttle has since been modified to allow for autonomous re-entry in case of necessity.

Per the Vision for Space Exploration, the Space Shuttle was retired in 2011 due mainly to its old age and high cost of program reaching over a billion dollars per flight. The Shuttle's human transport role is to be replaced by the partially reusable Crew Exploration Vehicle (CEV) no later than 2014. The Shuttle's heavy cargo transport role is to be replaced by expendable rockets such as the Evolved Expendable Launch Vehicle (EELV) or a Shuttle Derived Launch Vehicle.

Scaled Composites' SpaceShipOne was a reusable suborbital spaceplane that carried pilots Mike Melvill and Brian Binnie on consecutive flights in 2004 to win the Ansari X Prize. The Spaceship Company will build its successor SpaceShipTwo. A fleet of SpaceShipTwos operated by Virgin Galactic should begin reusable private spaceflight carrying paying passengers in 2011.

XCOR Aerospace also plans to initiate a suborbital commercial spaceflight service with the Lynx rocketplane in 2012 through a partnership with RocketShip Tours. First test flights are planned for 2011.

Unmanned spacecraft

See also: List of unmanned spacecraft by program, Timeline of spaceflight, Timeline of artificial satellites and space probes, List of Solar System probes, Space probe, Robotic spacecraft, Unmanned resupply spacecraft, and Satellite
The Hubble Space Telescope
Jules Verne Automated Transfer Vehicle (ATV) approaches the International Space Station on Monday, March 31, 2008.
Designed as manned but flown as unmanned only spacecraft
  • Zond/L1 – lunar flyby capsule
  • L3 – capsule and lunar lander
  • TKS – capsule
  • Buran Soviet shuttle
Semi-manned – manned as space stations or part of space stations
Earth Orbit satellites


As of June 2011, there are more than 2,000 spacecraft in orbit.[citation needed]

Lunar probes
Artist's conception of Cassini–Huygens as it enters Saturn's orbit
Artist's conception of the Phoenix spacecraft as it lands on Mars
Planetary probes
Other – deep space
Main article: Space probe
Fastest spacecraft
  • Helios I & II Solar Probes (252,792 km/h (157,078 mph)*)
Furthest spacecraft from the Sun
  • Pioneer 10 at 89.7 AU as of 2005, traveling outward at about 2.6 AU/year
  • Pioneer 11
  • Voyager 1 at 106.3 AU as of July 2008, traveling outward at about 3.6 AU/year
  • Voyager 2 at 85.49 AU as of July 2008, traveling outward at about 3.3 AU/year

Unfunded/canceled programs

The First Test Flight of the Delta Clipper-Experimental Advanced (DC-XA), a prototype launch system
Manned spacecraft
Multi-stage spaceplanes
SSTO spaceplanes

Spacecraft under development

The Orion spacecraft

Manned

Unmanned

Subsystems

A spacecraft system comprises various subsystems, dependent upon mission profile. Spacecraft subsystems comprise the spacecraft "bus" and may include: attitude determination and control (variously called ADAC, ADC or ACS), guidance, navigation and control (GNC or GN&C), communications (Comms), command and data handling (CDH or C&DH), power (EPS), thermal control (TCS), propulsion, and structures. Attached to the bus are typically payloads.

Life support
Spacecraft intended for human spaceflight must also include a life support system for the crew.
Reaction control system thrusters on the nose of the U.S. Space Shuttle
Attitude control
A Spacecraft needs an attitude control subsystem to be correctly oriented in space and respond to external torques and forces properly. The attitude control subsystem consists of sensors and actuators, together with controlling algorithms. The attitude control subsystem permits proper pointing for the science objective, sun pointing for power to the solar arrays and earth-pointing for communications.
GNC
Guidance refers to the calculation of the commands (usually done by the CDH subsystem) needed to steer the spacecraft where it is desired to be. Navigation means determining a spacecraft's orbital elements or position. Control means adjusting the path of the spacecraft to meet mission requirements. On some missions, GNC and Attitude Control are combined into one subsystem of the spacecraft.[citation needed]
Command and data handling
The CDH subsystem receives commands from the communications subsystem, performs validation and decoding of the commands, and distributes the commands to the appropriate spacecraft subsystems and components. The CDH also receives housekeeping data and science data from the other spacecraft subsystems and components, and packages the data for storage on a data recorder or transmission to the ground via the communications subsystem. Other functions of the CDH include maintaining the spacecraft clock and state-of-health monitoring.
Further information: [[:On-Board Data Handling]]
Power
Spacecraft need an electrical power generation and distribution subsystem for powering the various spacecraft subsystems. For spacecraft near the Sun, solar panels are frequently used to generate electrical power. Spacecraft designed to operate in more distant locations, for example Jupiter, might employ a Radioisotope Thermoelectric Generator (RTG) to generate electrical power. Electrical power is sent through power conditioning equipment before it passes through a power distribution unit over an electrical bus to other spacecraft components. Batteries are typically connected to the bus via a battery charge regulator, and the batteries are used to provide electrical power during periods when primary power is not available, for example when a Low Earth Orbit (LEO) spacecraft is eclipsed by the Earth.
Thermal control
Spacecraft must be engineered to withstand transit through the Earth's atmosphere and the space environment. They must operate in a vacuum with temperatures potentially ranging across hundreds of degrees Celsius as well as (if subject to reentry) in the presence of plasmas. Material requirements are such that either high melting temperature, low density materials such as beryllium and reinforced carbon-carbon or (possibly due to the lower thickness requirements despite its high density) tungsten or ablative carbon/carbon composites are used. Depending on mission profile, spacecraft may also need to operate on the surface of another planetary body. The thermal control subsystem can be passive, dependent on the selection of materials with specific radiative properties. Active thermal control makes use of electrical heaters and certain actuators such as louvers to control temperature ranges of equipments within specific ranges.
A launch vehicle, like this Proton rocket, is typically used to bring a spacecraft to orbit.
Propulsion
Spacecraft may or may not have a propulsion subsystem, depending upon whether or not the mission profile calls for propulsion. The Swift spacecraft is an example of a spacecraft that does not have a propulsion subsystem. Typically though, LEO spacecraft (for example Terra (EOS AM-1) include a propulsion subsystem for altitude adjustments (called drag make-up maneuvers) and inclination adjustment maneuvers. A propulsion system is also needed for spacecraft that perform momentum management maneuvers. Components of a conventional propulsion subsystem include fuel, tankage, valves, pipes, and thrusters. The TCS interfaces with the propulsion subsystem by monitoring the temperature of those components, and by preheating tanks and thrusters in preparation for a spacecraft maneuver.
Structures
Spacecraft must be engineered to withstand launch loads imparted by the launch vehicle, and must have a point of attachment for all the other subsystems. Depending upon mission profile, the structural subsystem might need to withstand loads imparted by entry into the atmosphere of another planetary body, and landing on the surface of another planetary body.
Payload
The payload is dependent upon the mission of the spacecraft, and is typically regarded as the part of the spacecraft "that pays the bills". Typical payloads could include scientific instruments (cameras, telescopes, or particle detectors, for example), cargo, or a human crew.
Ground segment
The ground segment, though not technically part of the spacecraft, is vital to the operation of the spacecraft. Typical components of a ground segment in use during normal operations include a mission operations facility where the flight operations team conducts the operations of the spacecraft, a data processing and storage facility, ground stations to radiate signals to and receive signals from the spacecraft, and a voice and data communications network to connect all mission elements.[4]
Launch vehicle
The launch vehicle propels the spacecraft from the Earth's surface, through the atmosphere, and into an orbit, the exact orbit being dependent upon mission configuration. The launch vehicle may be expendable or reusable.

See also

Wikimedia Commons has media related to Spacecraft.

References

  1. ^ F.J. Krieger (October 5, 1957). ""Announcement of the First Satellite," from Pravada". NASA.
  2. ^ "Vostok". Encyclopedia Astronautica.
  3. ^ http://en.wikipedia.org/wiki/Vega_1
  4. ^ "The Rosetta ground segment". ESA.int. 2004-02-17. Retrieved 2008-02-11.
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