Sun–Earth L1 Lagrange point

E193272

Lagrange point celestial mechanics equilibrium point

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.

Try in SPARQL Jump to: Surface forms Statements Referenced by

All labels observed (4)

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

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

The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.

Instruction

You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10.

# Requirements
- If you don't know the subject at all, return an empty list.
- If the subject is not a named entity, return an empty list.
- Include at least one triple where predicate is "instanceOf".
- Do not get too wordy.
- Separate several objects into multiple triples with one object.

Input

Subject: Sun–Earth L1 Lagrange point
Description of subject: 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.

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 ⓘ

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 ⓘ