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 |
| Sun–Earth L1 point halo orbit | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1734128 — 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 L1 Lagrange point Context triple: [Deep Space Climate Observatory, orbit, Sun–Earth L1 Lagrange point]
-
A.
Sun–Earth L2
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.
-
B.
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.
-
C.
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.
-
D.
SOHO mission
The SOHO mission (Solar and Heliospheric Observatory) is a joint ESA–NASA space observatory launched in 1995 to study the Sun’s interior, atmosphere, and solar wind, greatly advancing our understanding of solar physics and space weather.
-
E.
Lunar Gateway
The Lunar Gateway is a planned small, crew-tended space station in lunar orbit that will serve as a staging point and research outpost for sustained human exploration of the Moon and beyond.
- 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 L1 Lagrange point Target entity description: 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.
-
A.
Sun–Earth L2
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.
-
B.
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.
-
C.
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.
-
D.
SOHO mission
The SOHO mission (Solar and Heliospheric Observatory) is a joint ESA–NASA space observatory launched in 1995 to study the Sun’s interior, atmosphere, and solar wind, greatly advancing our understanding of solar physics and space weather.
-
E.
Lunar Gateway
The Lunar Gateway is a planned small, crew-tended space station in lunar orbit that will serve as a staging point and research outpost for sustained human exploration of the Moon and beyond.
- F. None of above. chosen
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 |
Sun–Earth system
ⓘ
linked to:
Solar 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 |
ESA
ⓘ
linked to:
European Space Agency
NASA ⓘ |
| scientificDiscipline |
astrophysics
ⓘ
celestial mechanics ⓘ space weather science ⓘ |
| spacecraftLocated |
ACE
ⓘ
Advanced Composition Explorer ⓘ DSCOVR ⓘ
linked to:
Deep Space Climate Observatory
Deep Space Climate Observatory ⓘ SOHO ⓘ Solar and Heliospheric Observatory ⓘ
linked to:
SOHO mission
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.
subject linked to:
SOHO mission
linked to: Sun–Earth L1 Lagrange point
National Institute of Standards and Technology Advanced Radiometer
→
locatedAtLagrangePoint
→
Sun–Earth L1
ⓘ
linked to: Sun–Earth L1 Lagrange point
linked to: Sun–Earth L1 Lagrange point