Gliese 581c
E268001
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| GJ 581 c | 2 |
| Gliese 581c canonical | 2 |
| Gl 581 c | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2459077 — 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 581c Context triple: [A Message From Earth, target, Gliese 581c]
-
A.
Tau Ceti
Tau Ceti is a nearby Sun-like star in the constellation Cetus, notable for its stability, potential planetary system, and historical importance as an early target in the search for extraterrestrial intelligence.
-
B.
Epsilon Eridani b
Epsilon Eridani b is a nearby Jupiter-like exoplanet candidate orbiting the young K-type star Epsilon Eridani, making it one of the closest known potential exoplanets to Earth.
-
C.
Epsilon Eridani
Epsilon Eridani is a nearby young K-type main-sequence star in the constellation Eridanus, notable for its debris disk and status as a prominent target in exoplanet and SETI searches.
-
D.
Platform of Venus
The Platform of Venus is a pre-Columbian Maya ceremonial structure at Chichén Itzá, likely associated with astronomical observations and rituals linked to the planet Venus.
-
E.
Eris
Eris is a distant, icy dwarf planet in the outer reaches of the Solar System, notable for its size comparable to Pluto and its role in prompting the redefinition of planetary status.
- 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 581c Target entity description: 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.
-
A.
Tau Ceti
Tau Ceti is a nearby Sun-like star in the constellation Cetus, notable for its stability, potential planetary system, and historical importance as an early target in the search for extraterrestrial intelligence.
-
B.
Epsilon Eridani b
Epsilon Eridani b is a nearby Jupiter-like exoplanet candidate orbiting the young K-type star Epsilon Eridani, making it one of the closest known potential exoplanets to Earth.
-
C.
Epsilon Eridani
Epsilon Eridani is a nearby young K-type main-sequence star in the constellation Eridanus, notable for its debris disk and status as a prominent target in exoplanet and SETI searches.
-
D.
Platform of Venus
The Platform of Venus is a pre-Columbian Maya ceremonial structure at Chichén Itzá, likely associated with astronomical observations and rituals linked to the planet Venus.
-
E.
Eris
Eris is a distant, icy dwarf planet in the outer reaches of the Solar System, notable for its size comparable to Pluto and its role in prompting the redefinition of planetary status.
- F. None of above. chosen
Statements (41)
| Predicate | Object |
|---|---|
| instanceOf |
exoplanet
ⓘ
super-Earth exoplanet ⓘ |
| alternativeName |
Gliese 581c
ⓘ
surface form:
GJ 581 c
Gliese 581c ⓘ
surface form:
Gl 581 c
|
| belongsToGalaxy | Milky Way ⓘ |
| catalogDesignation |
Gliese 581c
self-linksurface differs
ⓘ
surface form:
GJ 581 c
|
| declination | −07° 43′ 20″ (system) ⓘ |
| discoveredBy |
ESO 3.6 m Telescope
ⓘ
Michel Mayor ⓘ Stéphane Udry ⓘ |
| discoveryMethod | radial velocity ⓘ |
| discoveryYear | 2007 ⓘ |
| distanceFromEarth_ly | approximately 20.4 ⓘ |
| distanceFromEarth_pc | approximately 6.3 ⓘ |
| equilibriumTemperature_K |
roughly 320
ⓘ
up to about 360 ⓘ |
| habitabilityStatus |
now considered unlikely to be habitable
ⓘ
once considered potentially habitable ⓘ |
| hostStar |
Gliese 581 star system
ⓘ
surface form:
Gliese 581
|
| hostStarConstellation | Libra ⓘ |
| hostStarLuminosity_Solar | about 0.013 ⓘ |
| hostStarMass_SolarMasses | about 0.31 ⓘ |
| hostStarSpectralType | M3V ⓘ |
| hostStarType | red dwarf ⓘ |
| inHabitableZoneOf |
Gliese 581 star system
ⓘ
surface form:
Gliese 581
|
| insolationRelativeToEarth | greater than Earth ⓘ |
| likelyTidalLocking | yes ⓘ |
| locatedIn |
Gliese 581 star system
ⓘ
surface form:
Gliese 581 system
|
| locatedInConstellation | Libra ⓘ |
| massCategory | super-Earth ⓘ |
| minimumMass_EarthMasses | about 5 ⓘ |
| notableFor | first widely publicized potentially habitable super-Earth candidate ⓘ |
| orbitalPeriod_days | approximately 13 ⓘ |
| orbits |
Gliese 581 star system
ⓘ
surface form:
Gliese 581
|
| planetType | rocky (likely) ⓘ |
| radialVelocitySignalDetectedBy | HARPS spectrograph ⓘ |
| rightAscension | 15h 19m 26s (system) ⓘ |
| semiMajorAxis_AU | approximately 0.073 ⓘ |
| surfaceConditions |
likely extreme greenhouse effect
ⓘ
possible high surface temperatures ⓘ |
| system |
Gliese 581 star system
ⓘ
surface form:
Gliese 581 planetary 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 581c Description of subject: 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.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
GJ 581 c
this entity surface form:
GJ 581 c
this entity surface form:
Gl 581 c