HR 1948

E540364

HR 1948 is the Bright Star Catalogue designation for Alnitak, a prominent blue supergiant star forming the easternmost member of Orion’s Belt.

All labels observed (1)

Label Occurrences
HR 1948 canonical 3

How this entity was disambiguated

Statements (47)

Predicate Object
instanceOf blue supergiant
star
absoluteMagnitudeV about −5.3
alsoKnownAs Alnitak
Zeta Orionis
ζ Orionis
linked to: Zeta Orionis
apparentMagnitudeV about 1.7
associatedNebula Flame Nebula (NGC 2024)
linked to: Flame Nebula

Horsehead Nebula region
linked to: Horsehead Nebula
beltPosition easternmost star of Orion’s Belt
catalogDesignation HD 37742
HIP 26727
HR 1948
SAO 132444
colorIndex blue
constellation Orion
culturalSignificance prominent navigational star in Orion’s Belt
declination −01° 56′ 34″
distanceFromEarth_ly about 1260
distanceFromEarth_pc about 387
effectiveTemperature_K about 29000
evolutionaryStage post-main-sequence massive star
futureEvolution likely core-collapse supernova progenitor
galacticPopulation Orion OB1 association
hasComponent Alnitak A
linked to: Alnitak

Alnitak Aa
linked to: Alnitak

Alnitak Ab
linked to: Alnitak

Alnitak B
linked to: Alnitak
hemisphereVisibility both hemispheres
ionizes nearby interstellar gas
isComponentOf Alnitak multiple system
isIn Milky Way
Orion Molecular Cloud Complex
isPartOf Orion’s Belt
linked to: Orion Belt region
luminosity_solar about 100000
mass_solar about 33
metallicity near-solar
orbitalCompanion Alnitak Ab
linked to: Alnitak
orbitalPeriod_years about 7.3
parallax_mas about 2.6
properMotionDec_mas_yr about +2
properMotionRA_mas_yr about +3
radialVelocity_km_s about +16
radius_solar about 20
rightAscension 05h 40m 45s
spectralType O9.5 Iab
visibility naked-eye star

How these facts were elicited

Referenced by (3)

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

Alnitak hasHRDesignation HR 1948
HD 37742 catalogIdentifier HR 1948