Alnilam

E127427

Alnilam is a bright blue supergiant star that forms the central and most luminous point of Orion’s Belt in the constellation Orion.

All labels observed (2)

Label Occurrences
Alnilam canonical 13
Alnilam (small, in same field) 1

How this entity was disambiguated

Statements (48)

Predicate Object
instanceOf astronomical object
blue supergiant star
star
supergiant star
age_millionYears about 5
apparentMagnitude 1.69
bayerDesignation Epsilon Orionis
belongsTo Milky Way
bestSeenInMonth January
catalogIdentifier HD 37128
HIP 26311
HR 1903
SAO 132444
color blue
constellation Orion
declination −01° 12′ 07″
distanceFromEarth_ly about 2000
distanceFromEarth_pc about 600
effectiveTemperature_K about 27500
evolutionaryStage post-main-sequence
flamsteedDesignation 46 Orionis
galacticPopulation thin disk
hasCompanions possible faint optical companions
hemisphereVisibility both northern and southern hemispheres
isKeyFeatureOf Orion constellation pattern
linked to: Orion constellation
isMostLuminousStarOf Orion’s Belt
linked to: Orion constellation
isPartOf Orion OB1 association
Orion OB1b subgroup
isReferenceStarFor celestial navigation
isVariableStar true
isVisibleToNakedEye true
locatedIn Orion constellation
luminosity_solarLuminosities about 375000
mass_solarMasses about 30
memberOf Orion’s Belt
linked to: Orion constellation
metallicity_FeH near solar
nameEtymology derived from Arabic meaning “string of pearls” or “sapphire”
nameOriginLanguage Arabic
parallax_mas about 1.6
positionInAsterism central star of Orion’s Belt
properMotionDec_masPerYr about −1.0
properMotionRA_masPerYr about 1.5
radialVelocity_kmPerSec about 27
radius_solarRadii about 30
rightAscension 05h 36m 12.8s
spectralClass B0Ia
variableStarType Alpha Cygni-type variable
willEndAs core-collapse supernova

How these facts were elicited

Referenced by (14)

Full triples — surface form annotated when it differs from this entity's canonical label.

Orion's Belt hasStar Alnilam
subject linked to: Orion
Orion containsStar Alnilam
subject linked to: Orion constellation
Orion containsBlueSupergiant Alnilam
subject linked to: Orion constellation
46 Orionis isCounterpartOf Alnilam
46 Orionis isDifferentFrom Alnilam
46 Orionis angularSeparationFrom Alnilam (small, in same field)
linked to: Alnilam
HR 1903 alsoKnownAs Alnilam
HR 1903 hasProperName Alnilam
HD 37128 hasAlternativeName Alnilam
HIP 26311 alsoKnownAs Alnilam