Zeta Orionis
E540362
O-type supergiant
massive star
multiple star system
proper name of a star system
star in Orion's Belt
Zeta Orionis, traditionally known as Alnitak, is a massive, hot blue multiple star system forming the easternmost star of Orion’s Belt.
Observed surface forms (2)
| Surface form | Occurrences |
|---|---|
| Alnitak | 0 |
| Zeta Orionis A | 0 |
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
O-type supergiant
ⓘ
massive star ⓘ multiple star system ⓘ proper name of a star system ⓘ star in Orion's Belt ⓘ |
| alsoKnownAs |
Alnitak
NERFINISHED
ⓘ
Zeta Ori NERFINISHED ⓘ ζ Orionis NERFINISHED ⓘ |
| apparentMagnitudeV | 1.72 ⓘ |
| bayerDesignation | ζ Orionis NERFINISHED ⓘ |
| bestSeenIn | northern winter ⓘ |
| color | blue ⓘ |
| componentOfAsterism | Orion's Belt NERFINISHED ⓘ |
| constellation | Orion NERFINISHED ⓘ |
| culturalSignificance | important star in many mythologies associated with Orion ⓘ |
| declination_J2000 | −01° 56′ 34″ ⓘ |
| distanceFromEarth_ly | about 1260 ⓘ |
| distanceFromEarth_pc | about 387 ⓘ |
| effectiveTemperature_K | about 30000 ⓘ |
| evolutionaryStage | supergiant phase ⓘ |
| flamsteedDesignation | 50 Orionis NERFINISHED ⓘ |
| galacticPopulation | thin disk ⓘ |
| hasComponent |
Zeta Orionis A
NERFINISHED
ⓘ
Zeta Orionis B NERFINISHED ⓘ Zeta Orionis C NERFINISHED ⓘ |
| hasProperName | Alnitak NERFINISHED ⓘ |
| locatedIn | Milky Way ⓘ |
| luminosityComparedToSun | hundreds of thousands times solar luminosity ⓘ |
| massComparedToSun | significantly more massive than the Sun ⓘ |
| notableFor |
being one of the brightest O-type stars visible to the naked eye
ⓘ
forming the eastern end of Orion's Belt ⓘ |
| observedIn |
X-ray wavelengths
ⓘ
optical wavelengths ⓘ ultraviolet wavelengths ⓘ |
| partOf | Orion OB1 association NERFINISHED ⓘ |
| positionInOrionsBelt | easternmost star ⓘ |
| radialVelocity_km_s | about +18 ⓘ |
| refersTo | Zeta Orionis NERFINISHED ⓘ |
| rightAscension_J2000 | 05h 40m 45.5s ⓘ |
| spectralType | O9.5 Iab ⓘ |
| variableStarType | slight variability reported ⓘ |
| visibleFrom | both hemispheres ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.