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| Orbiter | |
|---|---|
| Name | Orbiter |
| Type | Spacecraft |
| First launch | 20th century |
| Manufacturer | various |
| Status | operational, retired |
Orbiter is a general term for a spacecraft designed to enter and remain in orbit around a celestial body rather than to land or escape to interplanetary space. Orbiter platforms have been used by agencies such as National Aeronautics and Space Administration, European Space Agency, Russian Federal Space Agency, China National Space Administration, and private companies like SpaceX and Blue Origin for scientific observation, reconnaissance, communications, and technology demonstration. Orbiter missions frequently interact with missions such as Hubble Space Telescope, International Space Station, Mars Reconnaissance Orbiter, and Lunar Reconnaissance Orbiter in coordinated campaigns.
Orbiter spacecraft evolved from early satellites like Sputnik 1 and Explorer 1 to complex platforms including Voyager 1, Magellan (spacecraft), and Cassini–Huygens. Nations and organizations including United Kingdom, France, Japan Aerospace Exploration Agency, and Indian Space Research Organisation have fielded orbiters for Earth observation, planetary science, and telecommunications. Orbiter missions often rely on launch providers such as Ariane 5, Falcon 9, and Proton (rocket) and are integrated into programs like Lunar Gateway and Artemis program.
Orbiter classes include low Earth orbit (LEO) platforms like Landsat, medium Earth orbit (MEO) systems such as GPS (satellite), geostationary orbit (GEO) communications satellites like Intelsat, and deep-space orbiters exemplified by Galileo (spacecraft), Juno (spacecraft), and Mars Odyssey. Design elements are influenced by agencies and manufacturers including Lockheed Martin, Northrop Grumman, Airbus Defence and Space, and Roscosmos. Components incorporate instruments from facilities like Jet Propulsion Laboratory, European Southern Observatory, and CERN collaborations for sensor development. Power systems draw on International Space Station lessons, using solar arrays similar to those on Ulysses (spacecraft) or radioisotope thermoelectric generators as used on New Horizons and Cassini–Huygens.
Orbiter deployment commonly uses launch sites such as Kennedy Space Center, Baikonur Cosmodrome, Guiana Space Centre, and Jiuquan Satellite Launch Center. Operational control is conducted by mission control centers like Johnson Space Center, European Space Operations Centre, Mission Control Center (Moscow), and ISRO Telemetry, Tracking and Command Network. Orbiters undergo mission phases influenced by programs such as Apollo program, Viking program, and Mars Exploration Program. In-orbit maneuvers employ propulsion modules from suppliers like Aerojet Rocketdyne and Yuzhmash, guided by navigation references including Deep Space Network and Global Positioning System.
Orbital mechanics rely on theories and equations developed by figures and institutions such as Isaac Newton, Johannes Kepler, and Pierre-Simon Laplace, and are taught at universities like Massachusetts Institute of Technology, Stanford University, and University of Cambridge. Orbiter trajectory design uses methods like Hohmann transfer influenced by research from Konstantin Tsiolkovsky and simulation tools from NASA Ames Research Center and European Space Research and Technology Centre. Perturbations considered include gravitational influences from bodies such as Moon, Sun, and Jupiter, as well as atmospheric drag studied by NOAA and European Centre for Medium-Range Weather Forecasts. Stability and control strategies reference work at MIT Lincoln Laboratory and Caltech.
Historic and contemporary programs include Mariner program, Magellan (spacecraft), Mars Reconnaissance Orbiter, Galileo (spacecraft), Cassini–Huygens, Venus Express, Pioneer program, and Ulysses (spacecraft). Planetary orbiters from agencies include Mars Express, Chandrayaan-2 orbital component, Hayabusa2 relay, and Zond program. Military and reconnaissance orbiters trace to projects like Corona (satellite), while commercial constellations include Iridium (satellite constellation), OneWeb, and Starlink.
Orbiter missions enable planetary geology studies like those on Mars Global Surveyor and Messenger (spacecraft), atmospheric science investigations akin to Juno (spacecraft) and Venus Express, and heliophysics research associated with SOHO and Parker Solar Probe collaborations. Remote sensing payloads often derive from instruments developed at Smithsonian Astrophysical Observatory, Los Alamos National Laboratory, and Max Planck Society. Applications extend to telecommunications via SES S.A. and Eutelsat, Earth observation for programs like Copernicus Programme and NOAA-20, and technology demonstrations supporting Commercial Crew Program and CubeSat standards championed by California Institute of Technology.
Orbiter missions are regulated by bodies including Federal Aviation Administration, International Telecommunication Union, United Nations Office for Outer Space Affairs, and national space agencies like NASA and Roscosmos. Safety and debris mitigation practices reference guidelines from Inter-Agency Space Debris Coordination Committee and incidents such as Kosmos 954 and Iridium–Cosmos collision. Risk management incorporates standards from International Organization for Standardization and research at European Space Agency and NASA Jet Propulsion Laboratory, addressing planetary protection policies developed at Committee on Space Research and treaties like the Outer Space Treaty.