HD 37742

E540365

HD 37742 is the bright blue supergiant star better known as Alnitak, the easternmost star in Orion’s Belt.

All labels observed (2)

Label Occurrences
HD 37742 canonical 5
HD 37742 A 1

How this entity was disambiguated

Statements (49)

Predicate Object
instanceOf X-ray source ⓘ
blue supergiant ⓘ
star ⓘ
age_Myr about 6 ⓘ
alsoKnownAs Alnitak ⓘ
Zeta Orionis ⓘ
ζ Orionis ⓘ
linked to: Zeta Orionis
angularSeparationFromComponentB_arcsec about 2.4 ⓘ
angularSeparationFromComponentC_arcsec about 57 ⓘ
apparentMagnitudeV 1.72 ⓘ
belongsToAssociation Orion OB1 association ⓘ
belongsToSubgroup Orion OB1b subgroup ⓘ
binaryComponent HD 37742 A ⓘ
linked to: HD 37742

HD 37742 B ⓘ
HD 37742 C ⓘ
linked to: HD 37742 B
catalogIdentifier HD 37742 ⓘ
HIP 26727 ⓘ
HR 1948 ⓘ
SAO 132444 ⓘ
colorIndexBminusV about −0.20 ⓘ
componentOf Orion’s Belt ⓘ
linked to: Orion Belt region
constellation Orion ⓘ
culturalSignificance one of the three stars of Orion’s Belt ⓘ
declination −01° 56′ 34″ ⓘ
distanceFromEarth_ly approximately 800 ⓘ
distanceFromEarth_pc approximately 250 ⓘ
drives strong stellar wind ⓘ
effectiveTemperature_K about 30000 ⓘ
equatorialCoordinateEpoch J2000 ⓘ
galacticPopulation thin disk ⓘ
hasStellarWindTerminalVelocity_kmPerSec about 2100 ⓘ
ionizes nearby interstellar gas ⓘ
locatedIn Orion Molecular Cloud Complex ⓘ
luminosity_solar about 250000 ⓘ
luminosityClass Iab ⓘ
mass_solar about 33 ⓘ
metallicity_FeH approximately solar ⓘ
parallax_mas about 3.9 ⓘ
positionInAsterism easternmost star of Orion’s Belt ⓘ
primaryComponentSpectralType O9.5Iab ⓘ
radialVelocity_kmPerSec about +25 ⓘ
radius_solar about 20 ⓘ
rightAscension 05h 40m 45s ⓘ
rotationalVelocity_kmPerSec about 110 ⓘ
secondaryComponentSpectralType B-type ⓘ
spectralClass O ⓘ
spectralType O9.5Iab ⓘ
variableType slight irregular variability ⓘ
visibleFrom both Northern and Southern Hemispheres ⓘ

How these facts were elicited

Referenced by (6)

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

Alnitak → hasHDDesignation → HD 37742 ⓘ
HR 1948 → catalogDesignation → HD 37742 ⓘ
HD 37742 → binaryComponent → HD 37742 A ⓘ
linked to: HD 37742
HD 37742 → catalogIdentifier → HD 37742 ⓘ
SAO 132444 → correspondsToHD → HD 37742 ⓘ