Gliese 581d
E935193
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Gliese 581d canonical | 4 |
| GJ 581d | 1 |
| Gl 581d | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11377019 — 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 581d Context triple: [Gliese 581 star system, hasExoplanet, Gliese 581d]
-
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.
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.
-
C.
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.
-
D.
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.
-
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 581d Target entity description: 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.
-
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.
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.
-
C.
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.
-
D.
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.
-
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 (49)
| Predicate | Object |
|---|---|
| instanceOf |
exoplanet
ⓘ
extrasolar planet ⓘ potentially rocky planet ⓘ super-Earth ⓘ |
| atmosphereRequirementForLiquidWater | dense CO2-rich atmosphere needed ⓘ |
| catalogDesignation |
GJ 581d
ⓘ
linked to:
Gliese 581d
Gl 581d ⓘ
linked to:
Gliese 581d
|
| comparedToEarth |
more massive than Earth
ⓘ
receives less stellar flux than Earth ⓘ |
| controversy |
existence questioned by some analyses
ⓘ
signal may be affected by stellar activity ⓘ |
| dataSource | radial velocity measurements from HARPS ⓘ |
| discoveredBy |
ESO HARPS team
ⓘ
linked to:
HARPS spectrograph
Michel Mayor ⓘ Stephane Udry ⓘ
linked to:
Stéphane Udry
Xavier Bonfils NERFINISHED ⓘ |
| discoveryFacility | ESO 3.6 m Telescope ⓘ |
| discoveryInstrument | HARPS spectrograph ⓘ |
| discoveryMethod | radial velocity ⓘ |
| discoveryObservatory | La Silla Observatory ⓘ |
| discoveryYear | 2007 ⓘ |
| eccentricity | about 0.38 ⓘ |
| equilibriumTemperature_K | about 183 ⓘ |
| estimatedMass_EarthMasses | about 6 ⓘ |
| followUpStudies | subject of climate and habitability modeling ⓘ |
| habitabilityStatus |
early candidate for habitable exoplanet
ⓘ
later considered less likely to be habitable ⓘ |
| hostStar |
Gliese 581
ⓘ
linked to:
Gliese 581 star system
|
| hostStarConstellation | Libra ⓘ |
| hostStarDistanceFromEarth_ly | about 20.3 ⓘ |
| hostStarSpectralType | M3V ⓘ |
| hostStarType | red dwarf ⓘ |
| locatedIn |
Gliese 581 system
ⓘ
linked to:
Gliese 581 star system
Milky Way ⓘ Solar neighborhood ⓘ |
| mediaNotability | one of the first widely publicized potentially habitable exoplanets ⓘ |
| minimumMass_EarthMasses | about 5.6 ⓘ |
| orbitalPeriod_days | about 66.8 ⓘ |
| orbits |
Gliese 581
ⓘ
linked to:
Gliese 581 star system
|
| otherPlanetsInSystem |
Gliese 581b
ⓘ
Gliese 581c ⓘ Gliese 581e ⓘ |
| partOf |
Gliese 581 planetary system
ⓘ
linked to:
Gliese 581 star system
|
| positionRelativeToHabitableZone | outer edge of habitable zone (under some models) ⓘ |
| radialVelocitySemiAmplitude_m_s | about 2.0 ⓘ |
| semiMajorAxis_AU | about 0.22 ⓘ |
| surfaceType | potentially rocky ⓘ |
| systemHasOtherPlanets | yes ⓘ |
| tidalLockingStatus | possibly tidally locked ⓘ |
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 581d Description of subject: 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.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Gliese 581d
linked to: Gliese 581d