HIP 26727
E540366
HIP 26727 is the Hipparcos catalog designation for Alnitak, a bright multiple star system forming the easternmost star of Orion’s Belt.
All labels observed (1)
| Label | Occurrences |
|---|---|
| HIP 26727 canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T5723591 — 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: HIP 26727 Context triple: [Alnitak, hasHIPDesignation, HIP 26727]
-
A.
HIP 62434
HIP 62434 is the Hipparcos catalog designation for Beta Crucis, a bright blue giant star in the Southern Cross constellation.
-
B.
HIP 60718
HIP 60718 is the Hipparcos catalog designation for Alpha Crucis, the brightest star in the Southern Cross constellation.
-
C.
HIP 17954
HIP 17954 is a star in the Pleiades open star cluster, known more commonly by its traditional name Sterope I.
-
D.
HIP 17608
HIP 17608 is a star in the constellation Taurus, more commonly known as 23 Tauri, and is cataloged in the Hipparcos star catalog.
-
E.
HIP 17531
HIP 17531 is a star in the Pleiades open star cluster, more commonly known by its traditional name Taygeta.
- 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: HIP 26727 Target entity description: HIP 26727 is the Hipparcos catalog designation for Alnitak, a bright multiple star system forming the easternmost star of Orion’s Belt.
-
A.
HIP 62434
HIP 62434 is the Hipparcos catalog designation for Beta Crucis, a bright blue giant star in the Southern Cross constellation.
-
B.
HIP 60718
HIP 60718 is the Hipparcos catalog designation for Alpha Crucis, the brightest star in the Southern Cross constellation.
-
C.
HIP 17954
HIP 17954 is a star in the Pleiades open star cluster, known more commonly by its traditional name Sterope I.
-
D.
HIP 17608
HIP 17608 is a star in the constellation Taurus, more commonly known as 23 Tauri, and is cataloged in the Hipparcos star catalog.
-
E.
HIP 17531
HIP 17531 is a star in the Pleiades open star cluster, more commonly known by its traditional name Taygeta.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Hipparcos star
ⓘ
multiple star system ⓘ star system ⓘ |
| alsoKnownAs |
Alnitak
ⓘ
Zeta Orionis ⓘ ζ Orionis ⓘ
linked to:
Zeta Orionis
|
| apparentMagnitudeV | 1.72 ⓘ |
| belongsToAssociation |
Orion OB1 association
ⓘ
linked to:
Orion OB association
|
| belongsToSubgroup |
Orion OB1b subgroup
ⓘ
linked to:
Orion OB association
|
| BrightStarDesignation | HR 1948 ⓘ |
| constellation | Orion ⓘ |
| declination | −01° 56′ 34″ ⓘ |
| distanceFromEarth |
about 250 parsecs
ⓘ
about 800 light-years ⓘ |
| equatorialCoordinateSystem |
ICRS
ⓘ
linked to:
International Celestial Reference System
|
| evolutionaryStage | massive evolved star ⓘ |
| FlamsteedDesignation | 50 Orionis ⓘ |
| galacticPopulation | Population I ⓘ |
| hasColorIndexBminusV | about −0.2 ⓘ |
| hasComponent |
Alnitak A
ⓘ
linked to:
Alnitak
Alnitak Aa ⓘ
linked to:
Alnitak
Alnitak Ab ⓘ
linked to:
Alnitak
Alnitak B ⓘ
linked to:
Alnitak
Alnitak C ⓘ
linked to:
Alnitak multiple system
|
| hasStellarWind | strong ⓘ |
| HenryDraperDesignation | HD 37742 ⓘ |
| isBrightStar | true ⓘ |
| isInCatalog |
Bright Star Catalogue
ⓘ
Flamsteed designation system ⓘ
linked to:
Flamsteed designations
Henry Draper Catalogue ⓘ Hipparcos Catalogue ⓘ |
| isIonizingSourceFor | nearby emission nebulae in Orion's Belt region ⓘ |
| isNakedEyeVisible | true ⓘ |
| isPartOfAsterism |
Orion's Belt
ⓘ
linked to:
Orion Belt region
|
| isReferenceStarFor | Orion constellation navigation and star charts ⓘ |
| luminosityOfPrimary | hundreds of thousands of times solar luminosity (order of magnitude) ⓘ |
| massOfPrimary | about 30 solar masses (order of magnitude) ⓘ |
| parallax | 3.00 mas (approximate) ⓘ |
| positionInAsterism | easternmost star of Orion's Belt ⓘ |
| properMotionDec | small negative (few mas/yr) ⓘ |
| properMotionRA | small positive (few mas/yr) ⓘ |
| radialVelocity | about +20 km/s (order of magnitude) ⓘ |
| rightAscension | 05h 40m 45.5s ⓘ |
| spectralType |
O-type supergiant (primary component)
ⓘ
O9.5Iab ⓘ |
| variableStarType | eclipsing binary (for inner pair) ⓘ |
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: HIP 26727 Description of subject: HIP 26727 is the Hipparcos catalog designation for Alnitak, a bright multiple star system forming the easternmost star of Orion’s Belt.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.