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Spacecraft reaction control systems are used for: attitude control during different stages of a mission; [3] station keeping in orbit; close maneuvering during docking procedures; control of orientation, or "pointing the nose" of the craft; a backup means of deorbiting; ullage motors to prime the fuel system for a main engine burn.
This part of the GEO station-keeping is called North-South control. [4] The East-West control is the control of the orbital period and the eccentricity vector performed by making thruster burns tangential to the orbit.
The Satellite Control Network (SCN), operated by the United States Space Force's Space Delta 6, provides support for the operation, control, and maintenance of a variety of United States Department of Defense and some non-DoD satellites. This involves continual execution of Telemetry, Tracking, and Commanding (TT&C) operations.
Without the support of the backroom, a controller might make a bad call based on faulty memory or information not readily available to the person on the console. The nature of quiescent operations aboard the International Space Station (ISS) today is such that the full team is not required for 24/7/365 support.
Mercury-Atlas 6 (MA-6) was the first crewed American orbital spaceflight, which took place on February 20, 1962. [4] Piloted by astronaut John Glenn and operated by NASA as part of Project Mercury, it was the fifth human spaceflight, preceded by Soviet orbital flights Vostok 1 and 2 and American sub-orbital flights Mercury-Redstone 3 and 4.
Automated systems brought the craft to within 200 meters (660 ft), while Beregovoy brought this closer with manual control. [ 14 ] The first successful crewed docking [ 15 ] occurred on January 16, 1969 when Soyuz 4 and Soyuz 5 docked, collecting the two crew members of Soyuz 5, which had to perform an extravehicular activity to reach Soyuz 4.
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In May 2019, Maxar Technologies was contracted by NASA to manufacture this module, which will also supply the station with electrical power and is based on Maxar's SSL 1300 series satellite bus. [30] The PPE will use Busek 6 kW Hall-effect thrusters and NASA Advanced Electric Propulsion System (AEPS) Hall-effect thrusters.
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