Achernar
E552642
Achernar is a bright, rapidly rotating blue-white star and the ninth-brightest star in the night sky, marking the end of the constellation Eridanus.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Achernar canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T5723758 — 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: Achernar Context triple: [Eridanus, containsStar, Achernar]
-
A.
Canopus
Canopus was an ancient Egyptian coastal city near modern-day Alexandria, known as a major religious center and sanctuary dedicated to the goddess Isis.
-
B.
Zeta Canis Majoris
Zeta Canis Majoris, also known as Furud, is a bright B-type main-sequence star in the constellation Canis Major.
-
C.
Arneb
Arneb is a luminous white supergiant star in the constellation Lepus, notable for its high brightness and advanced evolutionary stage.
-
D.
Eta Canis Majoris
Eta Canis Majoris, also known as Aludra, is a luminous blue supergiant star in the constellation Canis Major and one of its brightest members.
-
E.
Tau Canis Majoris
Tau Canis Majoris is a very luminous, massive blue-white multiple star system located in the constellation Canis Major and is one of the brightest members of the open cluster NGC 2362.
- 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: Achernar Target entity description: Achernar is a bright, rapidly rotating blue-white star and the ninth-brightest star in the night sky, marking the end of the constellation Eridanus.
-
A.
Canopus
Canopus was an ancient Egyptian coastal city near modern-day Alexandria, known as a major religious center and sanctuary dedicated to the goddess Isis.
-
B.
Zeta Canis Majoris
Zeta Canis Majoris, also known as Furud, is a bright B-type main-sequence star in the constellation Canis Major.
-
C.
Arneb
Arneb is a luminous white supergiant star in the constellation Lepus, notable for its high brightness and advanced evolutionary stage.
-
D.
Eta Canis Majoris
Eta Canis Majoris, also known as Aludra, is a luminous blue supergiant star in the constellation Canis Major and one of its brightest members.
-
E.
Tau Canis Majoris
Tau Canis Majoris is a very luminous, massive blue-white multiple star system located in the constellation Canis Major and is one of the brightest members of the open cluster NGC 2362.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Be star
ⓘ
main-sequence star ⓘ star ⓘ |
| belongsTo |
Milky Way
NERFINISHED
ⓘ
local spiral arm of the Milky Way ⓘ |
| hasAlternativeName | Alpha Eridani NERFINISHED ⓘ |
| hasApparentMagnitude | 0.46 ⓘ |
| hasApparentMagnitudeV | 0.46 ⓘ |
| hasBayerDesignation | α Eridani NERFINISHED ⓘ |
| hasCatalogIdentifier |
HD 10144
NERFINISHED
ⓘ
HIP 7588 NERFINISHED ⓘ HR 472 NERFINISHED ⓘ |
| hasColor | blue-white ⓘ |
| hasCompanion | Achernar B NERFINISHED ⓘ |
| hasCompanionSeparation | about 12 AU ⓘ |
| hasCompanionSpectralType | A-type main-sequence star ⓘ |
| hasConstellation | Eridanus NERFINISHED ⓘ |
| hasDeclination | −57° 14′ 12.3″ ⓘ |
| hasDistanceFromEarth |
about 139 light-years
ⓘ
about 43 parsecs ⓘ |
| hasEffectiveTemperature | about 15,000 K ⓘ |
| hasEmissionLines | hydrogen Balmer lines ⓘ |
| hasEquatorialToPolarRadiusRatio | about 1.5 ⓘ |
| hasFlamsteedDesignation | 39 Eridani NERFINISHED ⓘ |
| hasIAUNameStatus | approved star name ⓘ |
| hasLuminosity | about 3,000 times solar luminosity ⓘ |
| hasMass | about 6.7 solar masses ⓘ |
| hasParallax | 22.68 mas ⓘ |
| hasProperMotionDec | −40.08 mas/yr ⓘ |
| hasProperMotionRA | +88.02 mas/yr ⓘ |
| hasRadialVelocity | +16.7 km/s ⓘ |
| hasRadius |
about 5.8 solar radii (polar)
ⓘ
about 7.3 solar radii (equatorial) ⓘ |
| hasRightAscension | 01h 37m 42.845s ⓘ |
| hasRotationalVelocity | about 250 km/s ⓘ |
| hasRotationPeriod | about 2 days ⓘ |
| hasSpectralType | B6 Vep ⓘ |
| hasStellarClassification | B-type main-sequence star ⓘ |
| hasStellarWind | strong ⓘ |
| hasTraditionalNameOrigin | Arabic ⓘ |
| isDifficultToSeeFrom | most of the Northern Hemisphere ⓘ |
| isOblate | true ⓘ |
| isPartOfSystem | Achernar binary system NERFINISHED ⓘ |
| isRankedByBrightness | ninth-brightest star in the night sky ⓘ |
| isRapidlyRotating | true ⓘ |
| isUsedFor | celestial navigation ⓘ |
| isVisibleFrom | Southern Hemisphere NERFINISHED ⓘ |
| marks | end of the constellation Eridanus ⓘ |
| nameMeaning | end of the river ⓘ |
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: Achernar Description of subject: Achernar is a bright, rapidly rotating blue-white star and the ninth-brightest star in the night sky, marking the end of the constellation Eridanus.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.