Gliese 581g
E939826
exoplanet candidate
hypothetical planet
potentially habitable exoplanet candidate
unconfirmed exoplanet
Gliese 581g is a controversial, unconfirmed exoplanet candidate once thought to be a potentially habitable, Earth-like world orbiting the red dwarf star Gliese 581.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Gliese 581g canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T11377022 — 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 581g Context triple: [Gliese 581 star system, hasCandidateExoplanet, Gliese 581g]
-
A.
Gliese 581f
Gliese 581f is a proposed exoplanet orbiting the red dwarf star Gliese 581, once considered a potentially habitable world but whose very existence remains unconfirmed and debated.
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B.
Gliese 581d
Gliese 581d is a potentially rocky exoplanet orbiting the red dwarf star Gliese 581, once considered one of the first known candidates for a habitable world outside our solar system.
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C.
Gliese 581e
Gliese 581e is a low-mass exoplanet orbiting the red dwarf star Gliese 581, notable as one of the smallest exoplanets discovered around a main-sequence star at the time of its detection.
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D.
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.
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E.
Gliese 581b
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.
- 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 581g Target entity description: Gliese 581g is a controversial, unconfirmed exoplanet candidate once thought to be a potentially habitable, Earth-like world orbiting the red dwarf star Gliese 581.
-
A.
Gliese 581f
Gliese 581f is a proposed exoplanet orbiting the red dwarf star Gliese 581, once considered a potentially habitable world but whose very existence remains unconfirmed and debated.
-
B.
Gliese 581d
Gliese 581d is a potentially rocky exoplanet orbiting the red dwarf star Gliese 581, once considered one of the first known candidates for a habitable world outside our solar system.
-
C.
Gliese 581e
Gliese 581e is a low-mass exoplanet orbiting the red dwarf star Gliese 581, notable as one of the smallest exoplanets discovered around a main-sequence star at the time of its detection.
-
D.
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.
-
E.
Gliese 581b
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.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
exoplanet candidate
ⓘ
hypothetical planet ⓘ potentially habitable exoplanet candidate ⓘ unconfirmed exoplanet ⓘ |
| announced | September 2010 ⓘ |
| announcedBy | Lick–Carnegie Exoplanet Survey team NERFINISHED ⓘ |
| catalogStatus | often omitted from conservative exoplanet catalogs ⓘ |
| confirmationStatus |
controversial
ⓘ
unconfirmed ⓘ |
| constellation | Libra NERFINISHED ⓘ |
| controversyReason |
sensitivity of detection to data selection and noise modeling
ⓘ
weak radial-velocity signal near detection limits ⓘ |
| dataSource |
HARPS spectrograph radial-velocity data (reanalysed)
ⓘ
HIRES spectrograph on the Keck I telescope ⓘ |
| discoverer |
R. Paul Butler
NERFINISHED
ⓘ
Steven S. Vogt NERFINISHED ⓘ |
| discoveryMethod | radial velocity ⓘ |
| distanceFromEarth | about 20.3 light-years ⓘ |
| equilibriumTemperature | estimated to allow liquid water under suitable atmospheric conditions ⓘ |
| existenceStatus | disputed ⓘ |
| followUpAnalysis |
some analyses attribute the signal to stellar activity or noise
ⓘ
subsequent studies failed to confirm the signal ⓘ |
| habitabilityStatus | potentially habitable (if real) ⓘ |
| hostStar | Gliese 581 NERFINISHED ⓘ |
| hostStarSpectralType | M3V ⓘ |
| hostStarType | red dwarf ⓘ |
| mediaImpact | widely publicized as a potentially Earth-like world ⓘ |
| minimumMass | about 3.1 Earth masses ⓘ |
| notableFor | being among the first exoplanet candidates labeled “Goldilocks” or “just right” for life ⓘ |
| orbitalPeriod | about 37 days ⓘ |
| orbitalResonanceStatus | no secure resonance with other Gliese 581 planets established ⓘ |
| orbitalZone | habitable zone of Gliese 581 ⓘ |
| planetType | super-Earth candidate ⓘ |
| potentialForLiquidWater | possible on parts of the surface under suitable atmosphere assumptions ⓘ |
| publicPerception | sometimes still cited in popular media as an Earth-like planet despite doubts ⓘ |
| relatedObject |
Gliese 581c
NERFINISHED
ⓘ
Gliese 581d NERFINISHED ⓘ Gliese 581e NERFINISHED ⓘ Gliese 581f NERFINISHED ⓘ |
| researchStatus | no independent confirmation as of 2024 ⓘ |
| scientificDebate |
sparked debate over statistical methods in exoplanet detection
ⓘ
used as a case study in false-positive exoplanet claims ⓘ |
| semiMajorAxis | about 0.13 AU ⓘ |
| starSystem | Gliese 581 system NERFINISHED ⓘ |
| surfaceGravity | estimated to be similar to or somewhat higher than Earth’s ⓘ |
| tidalLockingStatus | likely tidally locked if it exists ⓘ |
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 581g Description of subject: Gliese 581g is a controversial, unconfirmed exoplanet candidate once thought to be a potentially habitable, Earth-like world orbiting the red dwarf star Gliese 581.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.