HD 37742
E540365
HD 37742 is the bright blue supergiant star better known as Alnitak, the easternmost star in Orion’s Belt.
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
X-ray source
ⓘ
blue supergiant ⓘ star ⓘ |
| age_Myr | about 6 ⓘ |
| alsoKnownAs |
Alnitak
NERFINISHED
ⓘ
Zeta Orionis NERFINISHED ⓘ ζ Orionis NERFINISHED ⓘ |
| angularSeparationFromComponentB_arcsec | about 2.4 ⓘ |
| angularSeparationFromComponentC_arcsec | about 57 ⓘ |
| apparentMagnitudeV | 1.72 ⓘ |
| belongsToAssociation | Orion OB1 association NERFINISHED ⓘ |
| belongsToSubgroup | Orion OB1b subgroup NERFINISHED ⓘ |
| binaryComponent |
HD 37742 A
NERFINISHED
ⓘ
HD 37742 B NERFINISHED ⓘ HD 37742 C NERFINISHED ⓘ |
| catalogIdentifier |
HD 37742
NERFINISHED
ⓘ
HIP 26727 NERFINISHED ⓘ HR 1948 NERFINISHED ⓘ SAO 132444 NERFINISHED ⓘ |
| colorIndexBminusV | about −0.20 ⓘ |
| componentOf | Orion’s Belt NERFINISHED ⓘ |
| constellation | Orion NERFINISHED ⓘ |
| 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 NERFINISHED ⓘ |
| 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 ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.