List of objects at Lagrangian points

List of objects at Lagrangian points

This is a list of known objects which have been, are or are planned to occupy any of the five Lagrangian points of two-body systems in space.

Sun-Earth Lagrangian points

L1

L1 is the Lagrangian point located approximately 1,500,000 km towards the Sun away from the Earth.

Past probes

*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.

Present probes

*GGS WIND
*The Solar and Heliospheric Observatory (SOHO)
*The Advanced Composition Explorer (ACE)

Planned probes

*LISA Pathfinder
*Kuafu

Cancelled probes

*The Triana satellite, designed to monitor global warming.

L2

L2 is the Lagrangian point located approximately 1,500,000 km away from the Earth in the direction opposite the Sun.

Past probes

*GEOTAIL

Present probes

*Wilkinson Microwave Anisotropy Probe (WMAP)

Planned probes

*The joint NASA, ESA and CSA James Webb Space Telescope (JWST), formerly known as the Next Generation Space Telescope (NGST)
*The ESA Herschel Space Observatory
*The ESA Planck Surveyor
*The ESA Gaia probe
*The NASA Terrestrial Planet Finder mission (may be placed in an Earth-trailing orbit instead)
*The ESA Darwin mission
*The NASA Advanced Technology Large-Aperture Space Telescope, that will replace both the Hubble Space Telescope and JWST.

Cancelled probes

*The ESA Eddington mission

L3

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

L4 is the Lagrangian point located close to the Earth's orbit 60° ahead of the Earth.

*Dust clouds ref|baez_math_ucr_edu

L5

L5 is the Lagrangian point located close to the Earth's orbit 60° behind the Earth.

*Dust clouds
*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.

Earth-Moon Lagrangian points

L2

*future location of TDRS-derived satellites to facilitate direct communications between Earth and far side of the Moon.Fact|date=April 2007

L4

*possible Kordylewski clouds

L5

*possible Kordylewski clouds

L4 and L5

*future location of TDRS-style communication satellites to support L2 satellite

Cancelled objects

In his book "" 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.

un-Mars Lagrangian points

Asteroids in the L4 and L5 Mars-Sun Lagrangian points are sometimes called "Mars Trojan asteroids", but "Trojan asteroid", as originally defined, is a term for asteroids in the L4 and L5 Jupiter-Sun Lagrangian points.

L4

*mpl|1999 UJ|7

L5

*5261 Eureka
*mpl|1998 VF|31, mpl|2001 DH|47, mpl|2001 FG|24, mpl|2001 FR|127 (not confirmed as true Lagrangian asteroids)

un-Jupiter Lagrangian points

Asteroids in the L4 and L5 Jupiter-Sun Lagrangian points are known as "Jupiter Trojan asteroids" or simply "Trojan asteroids".

L4

*Trojan asteroids, Greek camp

L5

*Trojan asteroids, Trojan camp


=Saturn-Tethys Lagrangian points=

L4

*Telesto

L5

*Calypso


=Saturn-Dione Lagrangian points=

L4

*Helene

L5

*Polydeuces

un-Neptune Lagrangian points

Asteroids in the L4 and L5 Neptune-Sun Lagrangian points are sometimes called "Neptune Trojan asteroids", but "Trojan asteroid", as originally defined, is a term for asteroids in the L4 and L5 Jupiter-Sun Lagrangian points.

L4

*mpl|2001 QR|322
*mpl|2004 UP|10
*mpl|2005 TN|53
*mpl|2005 TO|74
*mpl|2006 RJ|103
*mpl|2007 VL|305Source: Minor Planet Center [http://cfa-www.harvard.edu/iau/lists/NeptuneTrojans.html]

ee also

*Trojan points
*Trojan asteroid
*Trojan moon
*Trojan planet

References

# [http://math.ucr.edu/home/baez/lagrange.html John Baez' Lagrange Points page]


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