Sun–Earth L2

E59342

Lagrange point gravitational equilibrium point

Sun–Earth L2 is a gravitationally stable point in space located beyond Earth's orbit where the combined gravity of the Sun and Earth allows spacecraft, such as the James Webb Space Telescope, to maintain a relatively constant position with minimal fuel use.

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All labels observed (8)

Label	Occurrences
Sun–Earth L2 point	7
Sun–Earth L2 canonical	4
Sun–Earth L2 Lagrange point	3
Sun–Earth L2 halo orbit	2
Sun–Earth L2 point (planned for Roman Space Telescope)	1
Sun–Earth L2 region	1
Sun–Earth L2 via Herschel Space Observatory	1
second Lagrange point of the Sun–Earth system	1

How this entity was disambiguated

This entity first appeared as the object of triple T476158 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Sun–Earth L2
Context triple: [James Webb Space Telescope, librationPoint, Sun–Earth L2]

A. Deep Space Climate Observatory
The Deep Space Climate Observatory (DSCOVR) is a NOAA and NASA satellite positioned at the Sun–Earth L1 Lagrange point that continuously monitors solar wind conditions and provides real-time space weather and Earth observation data.
B. Oort cloud
The Oort cloud is a distant, spherical shell of icy bodies surrounding the Solar System, thought to be the source of many long-period comets.
C. Epsilon Eridani
Epsilon Eridani is a nearby young K-type main-sequence star in the constellation Eridanus, notable for its debris disk and status as a prominent target in exoplanet and SETI searches.
D. Tau Ceti
Tau Ceti is a nearby Sun-like star in the constellation Cetus, notable for its stability, potential planetary system, and historical importance as an early target in the search for extraterrestrial intelligence.
E. Orion Arm
The Orion Arm is a minor spiral arm of the Milky Way galaxy that contains our Solar System and many of the stars visible in the night sky.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Sun–Earth L2
Target entity description: Sun–Earth L2 is a gravitationally stable point in space located beyond Earth's orbit where the combined gravity of the Sun and Earth allows spacecraft, such as the James Webb Space Telescope, to maintain a relatively constant position with minimal fuel use.

A. Deep Space Climate Observatory
The Deep Space Climate Observatory (DSCOVR) is a NOAA and NASA satellite positioned at the Sun–Earth L1 Lagrange point that continuously monitors solar wind conditions and provides real-time space weather and Earth observation data.
B. Oort cloud
The Oort cloud is a distant, spherical shell of icy bodies surrounding the Solar System, thought to be the source of many long-period comets.
C. Epsilon Eridani
Epsilon Eridani is a nearby young K-type main-sequence star in the constellation Eridanus, notable for its debris disk and status as a prominent target in exoplanet and SETI searches.
D. Tau Ceti
Tau Ceti is a nearby Sun-like star in the constellation Cetus, notable for its stability, potential planetary system, and historical importance as an early target in the search for extraterrestrial intelligence.
E. Orion Arm
The Orion Arm is a minor spiral arm of the Milky Way galaxy that contains our Solar System and many of the stars visible in the night sky.
F. None of above. chosen

Statements (47)

Predicate	Object
instanceOf	Lagrange point ⓘ gravitational equilibrium point ⓘ
advantage	continuous view of deep space away from Sun and Earth ⓘ reduced fuel consumption for orbit maintenance compared to free heliocentric orbit ⓘ relatively constant geometry with Earth and Sun ⓘ stable thermal environment for spacecraft ⓘ
benefitForTelescopes	minimal Earth occultation of observed sky ⓘ reduced stray light from Earth and Moon ⓘ simplified sunshield design ⓘ
communication	continuous line of sight to Earth with high-gain antenna steering ⓘ
coOrbitsWith	Earth ⓘ
coordinateFrame	Sun–Earth rotating frame ⓘ
directionFromEarth	away from the Sun ⓘ
discoveredBy	Joseph-Louis Lagrange ⓘ
discoveryMethod	analytical solution of restricted three-body problem ⓘ
distanceFromEarth	about 0.01 astronomical units ⓘ approximately 1.5 million kilometers ⓘ
field	astrodynamics ⓘ celestial mechanics ⓘ
gravitationalInfluence	Earth ⓘ Sun ⓘ
illuminationCondition	Sun, Earth, and Moon remain on same side of spacecraft ⓘ
label	L2 ⓘ
locatedIn	Sun–Earth system ⓘ linked to: Solar System
missionDesign	spacecraft typically orbit around L2 rather than sit exactly at the point ⓘ
orbitalPeriod	approximately 1 year ⓘ
orbits	Sun ⓘ
positionType	collinear Lagrange point ⓘ
relatedConcept	Lagrange points L1, L3, L4, L5 in Sun–Earth system ⓘ
relativeTo	Earth ⓘ Sun ⓘ
requires	station-keeping maneuvers ⓘ
stabilityAxes	stable in rotating frame with active control ⓘ unstable along radial direction ⓘ
stabilityType	metastable ⓘ
typicalOrbit	Lissajous orbit ⓘ halo orbit ⓘ
usedBy	Euclid spacecraft ⓘ Gaia spacecraft ⓘ linked to: Gaia observatory Herschel Space Observatory ⓘ James Webb Space Telescope ⓘ Planck spacecraft ⓘ Spektr-RG observatory ⓘ
usedFor	astrometry ⓘ cosmic microwave background observations ⓘ cosmology missions ⓘ infrared astronomy ⓘ

How these facts were elicited

Referenced by (20)

Full triples — surface form annotated when it differs from this entity's canonical label.

James Webb Space Telescope → librationPoint → Sun–Earth L2 ⓘ

NIRCam → observatoryLocation → Sun–Earth L2 point ⓘ

linked to: Sun–Earth L2

NIRSpec → observatoryLocation → Sun–Earth L2 point ⓘ

linked to: Sun–Earth L2

Mid-Infrared Instrument → hostTelescopeOrbit → Sun–Earth L2 point ⓘ

linked to: Sun–Earth L2

Near Infrared Imager and Slitless Spectrograph → observatoryLocation → Sun–Earth L2 point ⓘ

linked to: Sun–Earth L2

Nancy Grace Roman Space Telescope → orbitType → Sun–Earth L2 halo orbit ⓘ

linked to: Sun–Earth L2

Gaia observatory → orbitAround → Sun–Earth L2 Lagrange point ⓘ

linked to: Sun–Earth L2

Herschel Space Observatory → location → Sun–Earth L2 ⓘ

Sun–Earth L2 → indexInSet → second Lagrange point of the Sun–Earth system ⓘ

subject linked to: L2

linked to: Sun–Earth L2

Lissajous orbit → isUsedAt → Sun–Earth L2 point ⓘ

linked to: Sun–Earth L2

Integrated Science Instrument Module → orbit → Sun–Earth L2 halo orbit ⓘ

subject linked to: integrated science instrument module

linked to: Sun–Earth L2

Euclid spacecraft → cosmicLocation → Sun–Earth L2 point ⓘ

linked to: Sun–Earth L2

Wide Field Instrument → observatoryLocation → Sun–Earth L2 point (planned for Roman Space Telescope) ⓘ

linked to: Sun–Earth L2

PACS → observedFrom → Sun–Earth L2 point ⓘ

linked to: Sun–Earth L2

SPIRE → observatoryLocation → Sun–Earth L2 Lagrange point ⓘ

linked to: Sun–Earth L2

HIFI → observatoryOrbit → Sun–Earth L2 via Herschel Space Observatory ⓘ

linked to: Sun–Earth L2

Low Frequency Instrument → placedAt → Sun–Earth L2 Lagrange point ⓘ

linked to: Sun–Earth L2

High Frequency Instrument → hostSpacecraftOrbit → Sun–Earth L2 ⓘ

L1 → hasNeighbor → Sun–Earth L2 ⓘ

Chang’e 2 → traveledTo → Sun–Earth L2 region ⓘ

linked to: Sun–Earth L2

All labels observed (8)

How this entity was disambiguated Show

Statements (47)

How these facts were elicited Show

Referenced by (20)

How this entity was disambiguated

How these facts were elicited