List of objects at Lagrangian points
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This is a list of known objects which occupy, have occupied, or are planned to occupy any of the five Lagrangian points of two-body systems in space.
A diagram showing the five Lagrangian points in a two-body system|
Sun-Earth Lagrangian points
L1 is the Lagrangian point located approximately 1,500,000 km towards the Sun away from the Earth.
- International Cometary Explorer, formerly the International Sun-Earth Explorer 3 (ISEE-3), diverted out of L1 in 1983 for a comet rendezvous mission. Currently in solar orbit, it may be captured in 2014 when it next approaches Earth.
- NASA's Genesis probe collected solar wind samples at L1 from December 3, 2001 to April 1, 2004, when it returned to Earth.
- The Triana satellite, designed to monitor global warming.
L2 is the Lagrangian point located approximately 1,500,000 km away from the Earth in the direction opposite the Sun.
L3 is the Lagrangian point located on the side of the Sun opposite the Earth, slightly outside the Earth's orbit.
- There are no known objects in this orbital location.
L4 is the Lagrangian point located close to the Earth's orbit 60° ahead of the Earth.
- STEREO A (Solar TErrestrial RElations Observatory – Ahead) The twin STEREO spacecraft passed through L4 and L5 in autumn 2009.
- Dust clouds
L5 is the Lagrangian point located close to the Earth's orbit 60° behind the Earth.
- STEREO B (Solar TErrestrial RElations Observatory – Behind)
- Spitzer is in an earth-trailing heliocentric orbit drifting away circa 0.1 AU per year. In circa 2013-15 it will pass L5 in its orbit.
- Dust Clouds
Earth-Moon Lagrangian points
L4 and L5
- possible Kordylewski clouds
- STEREO A and B will search for Earth Lagrangian asteroids as they pass through the L4 and L5 regions, respectively, in 2010. They will have another opportunity as they loop back around through the opposite Lagrangian points several years later.
- future location of TDRS-style communication satellites to support L2 satellite
In his book "The High Frontier" Dr. Gerard O'Neill proposed the establishment of gigantic Space Islands in L5. The inhabitants of the L5 Society should convert Lunar material to huge solar power satellites.
Sun-Mars Lagrangian points
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Published - July 2009