HD 37742
E540365
HD 37742 is the bright blue supergiant star better known as Alnitak, the easternmost star in Orion’s Belt.
All labels observed (1)
| Label | Occurrences |
|---|---|
| HD 37742 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5723590 — 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: HD 37742 Context triple: [Alnitak, hasHDDesignation, HD 37742]
-
A.
HD 23480
HD 23480 is a bright B-type main-sequence star in the constellation Taurus, visible to the naked eye and cataloged under multiple stellar designations including 23 Tauri.
-
B.
HD 278942
HD 278942 is a massive, young, early-type star located in the Perseus constellation and associated with the Perseus OB2 stellar association.
-
C.
HD 24534
HD 24534 is a hot, massive early-type star located in the Perseus constellation and associated with the young Perseus OB2 stellar association.
-
D.
HD 24760
HD 24760 is a hot, massive early-type star in the constellation Perseus, notable as a member of the young Perseus OB2 stellar association.
-
E.
HD 24970
HD 24970 is a star located in the Perseus constellation and identified as a member of the Perseus OB2 stellar association.
- 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: HD 37742 Target entity description: HD 37742 is the bright blue supergiant star better known as Alnitak, the easternmost star in Orion’s Belt.
-
A.
HD 23480
HD 23480 is a bright B-type main-sequence star in the constellation Taurus, visible to the naked eye and cataloged under multiple stellar designations including 23 Tauri.
-
B.
HD 278942
HD 278942 is a massive, young, early-type star located in the Perseus constellation and associated with the Perseus OB2 stellar association.
-
C.
HD 24534
HD 24534 is a hot, massive early-type star located in the Perseus constellation and associated with the young Perseus OB2 stellar association.
-
D.
HD 24760
HD 24760 is a hot, massive early-type star in the constellation Perseus, notable as a member of the young Perseus OB2 stellar association.
-
E.
HD 24970
HD 24970 is a star located in the Perseus constellation and identified as a member of the Perseus OB2 stellar association.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
X-ray source
ⓘ
blue supergiant ⓘ star ⓘ |
| age_Myr | about 6 ⓘ |
| alsoKnownAs |
Alnitak
NERFINISHED
ⓘ
Zeta Orionis NERFINISHED ⓘ ζ Orionis NERFINISHED ⓘ |
| angularSeparationFromComponentB_arcsec | about 2.4 ⓘ |
| angularSeparationFromComponentC_arcsec | about 57 ⓘ |
| apparentMagnitudeV | 1.72 ⓘ |
| belongsToAssociation | Orion OB1 association NERFINISHED ⓘ |
| belongsToSubgroup | Orion OB1b subgroup NERFINISHED ⓘ |
| binaryComponent |
HD 37742 A
NERFINISHED
ⓘ
HD 37742 B NERFINISHED ⓘ HD 37742 C NERFINISHED ⓘ |
| catalogIdentifier |
HD 37742
NERFINISHED
ⓘ
HIP 26727 NERFINISHED ⓘ HR 1948 NERFINISHED ⓘ SAO 132444 NERFINISHED ⓘ |
| colorIndexBminusV | about −0.20 ⓘ |
| componentOf | Orion’s Belt NERFINISHED ⓘ |
| constellation | Orion NERFINISHED ⓘ |
| culturalSignificance | one of the three stars of Orion’s Belt ⓘ |
| declination | −01° 56′ 34″ ⓘ |
| distanceFromEarth_ly | approximately 800 ⓘ |
| distanceFromEarth_pc | approximately 250 ⓘ |
| drives | strong stellar wind ⓘ |
| effectiveTemperature_K | about 30000 ⓘ |
| equatorialCoordinateEpoch | J2000 ⓘ |
| galacticPopulation | thin disk ⓘ |
| hasStellarWindTerminalVelocity_kmPerSec | about 2100 ⓘ |
| ionizes | nearby interstellar gas ⓘ |
| locatedIn | Orion Molecular Cloud Complex NERFINISHED ⓘ |
| luminosity_solar | about 250000 ⓘ |
| luminosityClass | Iab ⓘ |
| mass_solar | about 33 ⓘ |
| metallicity_FeH | approximately solar ⓘ |
| parallax_mas | about 3.9 ⓘ |
| positionInAsterism | easternmost star of Orion’s Belt ⓘ |
| primaryComponentSpectralType | O9.5Iab ⓘ |
| radialVelocity_kmPerSec | about +25 ⓘ |
| radius_solar | about 20 ⓘ |
| rightAscension | 05h 40m 45s ⓘ |
| rotationalVelocity_kmPerSec | about 110 ⓘ |
| secondaryComponentSpectralType | B-type ⓘ |
| spectralClass | O ⓘ |
| spectralType | O9.5Iab ⓘ |
| variableType | slight irregular variability ⓘ |
| visibleFrom | both Northern and Southern Hemispheres ⓘ |
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: HD 37742 Description of subject: HD 37742 is the bright blue supergiant star better known as Alnitak, the easternmost star in Orion’s Belt.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.