HR 1903
E545061
HR 1903 is the Bright Star Catalogue designation for Alnilam, the luminous blue supergiant star forming the central point of Orion’s Belt.
All labels observed (1)
| Label | Occurrences |
|---|---|
| HR 1903 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5775407 — 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: HR 1903 Context triple: [Alnilam, catalogIdentifier, HR 1903]
-
A.
HR 1852
HR 1852 is a bright multiple star system in the constellation Orion, better known as Mintaka, one of the three stars forming Orion’s Belt.
-
B.
HR 1948
HR 1948 is the Bright Star Catalogue designation for Alnitak, a prominent blue supergiant star forming the easternmost member of Orion’s Belt.
-
C.
HR 1149
HR 1149 is a star in the Pleiades open star cluster, also known by the traditional name Taygeta.
-
D.
HR 1084
HR 1084 is the catalog designation for Epsilon Eridani, a nearby young K-type main-sequence star known for its prominent debris disk and exoplanetary system.
-
E.
HR 1178
HR 1178 is a bright blue-white star in the Pleiades open star cluster in the constellation Taurus, traditionally known as Sterope I.
- 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: HR 1903 Target entity description: HR 1903 is the Bright Star Catalogue designation for Alnilam, the luminous blue supergiant star forming the central point of Orion’s Belt.
-
A.
HR 1852
HR 1852 is a bright multiple star system in the constellation Orion, better known as Mintaka, one of the three stars forming Orion’s Belt.
-
B.
HR 1948
HR 1948 is the Bright Star Catalogue designation for Alnitak, a prominent blue supergiant star forming the easternmost member of Orion’s Belt.
-
C.
HR 1149
HR 1149 is a star in the Pleiades open star cluster, also known by the traditional name Taygeta.
-
D.
HR 1084
HR 1084 is the catalog designation for Epsilon Eridani, a nearby young K-type main-sequence star known for its prominent debris disk and exoplanetary system.
-
E.
HR 1178
HR 1178 is a bright blue-white star in the Pleiades open star cluster in the constellation Taurus, traditionally known as Sterope I.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Bright Star Catalogue object
ⓘ
blue supergiant ⓘ star ⓘ |
| alsoKnownAs |
Alnilam
NERFINISHED
ⓘ
Epsilon Orionis NERFINISHED ⓘ |
| apparentMagnitudeV | 1.69 ⓘ |
| belongsTo |
Milky Way Galaxy
NERFINISHED
ⓘ
Orion OB1 association NERFINISHED ⓘ |
| bestViewingSeason | northern winter ⓘ |
| catalogDesignation |
BD−01°969
NERFINISHED
ⓘ
HD 37128 NERFINISHED ⓘ HIP 26311 NERFINISHED ⓘ HR 1903 NERFINISHED ⓘ SAO 132444 NERFINISHED ⓘ |
| colorIndex | blue ⓘ |
| constellation | Orion NERFINISHED ⓘ |
| declination | −01° 12′ ⓘ |
| distanceFromEarth_ly | about 2000 ⓘ |
| distanceFromEarth_pc | about 600 ⓘ |
| dominantEnergyOutput | ultraviolet radiation ⓘ |
| effectiveTemperature_K | about 27500 ⓘ |
| equatorialCoordinateSystem | J2000 ⓘ |
| evolutionaryStage | supergiant ⓘ |
| galacticPopulation | Population I NERFINISHED ⓘ |
| hasProperName | Alnilam NERFINISHED ⓘ |
| hasRadialVelocity | about +27 km/s ⓘ |
| hasRotationalVelocity | about 40 km/s ⓘ |
| hemisphereVisibility | both northern and southern hemispheres ⓘ |
| influences | surrounding interstellar medium in Orion ⓘ |
| isMassiveStar | true ⓘ |
| isOneOf | three main stars of Orion’s Belt ⓘ |
| isPartOf | Orion’s Belt NERFINISHED ⓘ |
| isSingleStar | likely ⓘ |
| isVisibleToNakedEye | true ⓘ |
| luminosityComparedToSun | about 375000 ⓘ |
| massComparedToSun | about 30 ⓘ |
| metallicityComparedToSun | slightly subsolar ⓘ |
| nameEtymology | from Arabic meaning “string of pearls” or “sapphire” ⓘ |
| neighboringBeltStar |
Alnitak
NERFINISHED
ⓘ
Mintaka NERFINISHED ⓘ |
| positionInAsterism | central star of Orion’s Belt ⓘ |
| radiusComparedToSun | about 32 ⓘ |
| rightAscension | 05h 36m ⓘ |
| spectralType | B0Ia ⓘ |
| variableStarType | Alpha Cygni-type candidate ⓘ |
| willEndAs | core-collapse supernova ⓘ |
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: HR 1903 Description of subject: HR 1903 is the Bright Star Catalogue designation for Alnilam, the luminous blue supergiant star forming the central point of Orion’s Belt.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.