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.
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 ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.