Sun–Earth L1 Lagrange point

E193272

The Sun–Earth L1 Lagrange point is a gravitationally stable location between the Earth and the Sun where spacecraft can maintain a relatively fixed position with minimal fuel, ideal for continuous solar and space weather observations.

All labels observed (4)

Label Occurrences
Sun–Earth L1 Lagrange point canonical 9
Sun–Earth L1 2
Sun–Earth L1 point 1

How this entity was disambiguated

Statements (48)

Predicate Object
instanceOf Lagrange point
celestial mechanics equilibrium point
advantage minimal Earth occultation of the Sun
reduced fuel consumption for long-term solar monitoring
uninterrupted view of the Sun
benefitForEarth advance warning of geomagnetic storms
monitoring of solar activity affecting satellites and power grids
coOrbitsWith Earth
coordinateSystem rotating frame co-rotating with Earth around the Sun
definedBy restricted three-body problem of Sun and Earth
distanceFromEarth about 0.01 astronomical units
approximately 1.5 million kilometers
distanceFromSun approximately 1 astronomical unit minus 1.5 million kilometers
gravitationalInfluenceFrom Earth
Sun
labelInSystem L1
liesOnLineConnecting Sun and Earth
locatedIn Solar System
surface form: Sun–Earth system
numberInSystem one of five Lagrange points in the Sun–Earth system
observes interplanetary magnetic field
solar corona
solar photosphere
solar wind
orbitalPeriod approximately 1 year
orbits Sun
positionRelativeToEarth between Earth and the Sun
positionRelativeToSun between Sun and the Earth
primaryUseAgency European Space Agency
surface form: ESA

NASA
scientificDiscipline astrophysics
celestial mechanics
space weather science
spacecraftLocated ACE
Advanced Composition Explorer
Deep Space Climate Observatory
surface form: DSCOVR

Deep Space Climate Observatory
SOHO
SOHO mission
surface form: Solar and Heliospheric Observatory

Wind spacecraft
stabilityDescription stable in the rotating frame but requires station-keeping
stabilityType metastable
stationKeepingDeltaV low compared to low Earth orbit missions of similar duration
typicalSpacecraftOrbit Lissajous orbit
halo orbit
usedFor continuous solar observation
early warning of solar storms
heliophysics research
space weather monitoring

How these facts were elicited

Referenced by (13)

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

Deep Space Climate Observatory orbit Sun–Earth L1 Lagrange point
SOHO mission librationPoint Sun–Earth L1 Lagrange point
subject surface form: SOHO
this entity surface form: Sun–Earth L1
ACE spacecraft location Sun–Earth L1 Lagrange point
ACE spacecraft orbitsBody Sun–Earth L1 Lagrange point
Triana orbit Sun–Earth L1 Lagrange point
Triana orbit Sun–Earth L1 Lagrange point
subject surface form: DSCOVR
EPIC camera locatedAt Sun–Earth L1 Lagrange point
EPIC camera orbits Sun–Earth L1 Lagrange point
NISTAR operatedFrom Sun–Earth L1 Lagrange point
NISTAR orbits Sun–Earth L1 Lagrange point
this entity surface form: Sun–Earth L1 point halo orbit
National Institute of Standards and Technology Advanced Radiometer locatedAtLagrangePoint Sun–Earth L1 Lagrange point
this entity surface form: Sun–Earth L1
Lissajous orbit isUsedAt Sun–Earth L1 Lagrange point
this entity surface form: Sun–Earth L1 point
SOHO orbits Sun–Earth L1 Lagrange point