Gliese 581b
E931692
Gliese 581b is a massive, close-orbiting exoplanet in the Gliese 581 system, notable as one of the early and well-studied planets discovered around a red dwarf star.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Gliese 581b canonical | 4 |
| GJ 581 b | 2 |
| Gl 581 b | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11377017 — 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: Gliese 581b Context triple: [Gliese 581 star system, hasExoplanet, Gliese 581b]
-
A.
Gliese 581c
Gliese 581c is an exoplanet orbiting the red dwarf star Gliese 581 in the constellation Libra, once considered a potentially habitable “super-Earth” due to its size and location in its star’s habitable zone.
-
B.
Kepler-186f
Kepler-186f is an Earth-sized exoplanet located in the habitable zone of its red dwarf star, notable as one of the first potentially Earth-like worlds discovered outside our solar system.
-
C.
Kepler-452b
Kepler-452b is an exoplanet often dubbed "Earth’s cousin" because it orbits within the habitable zone of a Sun-like star and shares several Earth-like characteristics.
-
D.
Gliese 581 star system
The Gliese 581 star system is a nearby red dwarf system in the constellation Libra that gained prominence for its potentially habitable exoplanets and as a target for interstellar messages from Earth.
-
E.
Kepler-22b
Kepler-22b is an exoplanet located in its star’s habitable zone and was one of the first such worlds discovered by NASA’s Kepler space telescope.
- 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: Gliese 581b Target entity description: Gliese 581b is a massive, close-orbiting exoplanet in the Gliese 581 system, notable as one of the early and well-studied planets discovered around a red dwarf star.
-
A.
Gliese 581c
Gliese 581c is an exoplanet orbiting the red dwarf star Gliese 581 in the constellation Libra, once considered a potentially habitable “super-Earth” due to its size and location in its star’s habitable zone.
-
B.
Kepler-186f
Kepler-186f is an Earth-sized exoplanet located in the habitable zone of its red dwarf star, notable as one of the first potentially Earth-like worlds discovered outside our solar system.
-
C.
Kepler-452b
Kepler-452b is an exoplanet often dubbed "Earth’s cousin" because it orbits within the habitable zone of a Sun-like star and shares several Earth-like characteristics.
-
D.
Gliese 581 star system
The Gliese 581 star system is a nearby red dwarf system in the constellation Libra that gained prominence for its potentially habitable exoplanets and as a target for interstellar messages from Earth.
-
E.
Kepler-22b
Kepler-22b is an exoplanet located in its star’s habitable zone and was one of the first such worlds discovered by NASA’s Kepler space telescope.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
exoplanet
ⓘ
extrasolar planet ⓘ giant planet ⓘ hot Neptune ⓘ |
| announcedBy | European Southern Observatory ⓘ |
| catalogDesignation |
GJ 581 b
ⓘ
linked to:
Gliese 581b
Gl 581 b ⓘ
linked to:
Gliese 581b
|
| declination | −07° 43′ 20″ (host star) ⓘ |
| discoveredBy |
Geneva Extrasolar Planet Search team
ⓘ
linked to:
Geneva exoplanet search group
Michel Mayor ⓘ Stéphane Udry ⓘ |
| discoveryDate | 2005-08-25 ⓘ |
| discoveryMethod | radial velocity ⓘ |
| discoveryYear | 2005 ⓘ |
| distanceFromEarth |
approximately 20.3 light-years
ⓘ
approximately 6.2 parsecs ⓘ |
| equilibriumTemperature | high ⓘ |
| equilibriumTemperatureCategory | too hot for liquid water on surface ⓘ |
| followUpObservations | extensive radial-velocity monitoring ⓘ |
| habitabilityStatus | not in habitable zone ⓘ |
| hasAlternativeName |
GJ 581 b
ⓘ
linked to:
Gliese 581b
|
| hasAtmosphere | likely (inferred, not directly detected) ⓘ |
| hostStar |
Gliese 581
ⓘ
linked to:
Gliese 581 star system
|
| hostStarApparentMagnitude | 10.56 ⓘ |
| hostStarConstellation | Libra ⓘ |
| hostStarEffectiveTemperature | approximately 3480 K ⓘ |
| hostStarMass | approximately 0.31 solar masses ⓘ |
| hostStarMetallicity | sub-solar metallicity ⓘ |
| hostStarRadius | approximately 0.29 solar radii ⓘ |
| hostStarSpectralType | M3V ⓘ |
| hostStarType | red dwarf ⓘ |
| locatedIn | Libra constellation ⓘ |
| massCategory | Neptune-mass planet ⓘ |
| memberOf |
Gliese 581 planetary system
ⓘ
linked to:
Gliese 581 star system
|
| minimumMass |
approximately 0.054 Jupiter masses
ⓘ
approximately 15.8 Earth masses ⓘ |
| notableFor |
being one of the earliest exoplanets discovered around a red dwarf star
ⓘ
being one of the first well-studied planets in the Gliese 581 system ⓘ |
| orbitalEccentricity | low eccentricity ⓘ |
| orbitalPeriod | approximately 5.37 days ⓘ |
| orbits |
Gliese 581
ⓘ
linked to:
Gliese 581 star system
|
| positionInSystem | innermost confirmed planet of Gliese 581 system (as originally reported) ⓘ |
| radialVelocitySemiAmplitude | approximately 12.5 m/s ⓘ |
| researchInterest |
dynamics of compact multi-planet systems
ⓘ
planet formation around low-mass stars ⓘ |
| rightAscension | 15h 19m 26s (host star) ⓘ |
| semiMajorAxis | approximately 0.041 AU ⓘ |
| systemMultiplicity | multi-planet system ⓘ |
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: Gliese 581b Description of subject: Gliese 581b is a massive, close-orbiting exoplanet in the Gliese 581 system, notable as one of the early and well-studied planets discovered around a red dwarf star.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Gliese 581b
linked to: Gliese 581b
linked to: Gliese 581b