Alnitak

E126206

Alnitak is a bright multiple star system in the constellation Orion, forming the easternmost star of the prominent asterism known as Orion’s Belt.

All labels observed (5)

Label Occurrences
Alnitak canonical 3
Alnitak Aa 1
Alnitak Ab 1

How this entity was disambiguated

Statements (49)

Predicate Object
instanceOf astronomical object
multiple star system
stellar system
absoluteMagnitudeV −5.25
age_Myr about 6
apparentMagnitudeV 1.72
belongsToAssociation Orion OB association
surface form: Orion OB1 association
belongsToSubgroup Orion OB association
surface form: Orion OB1b subgroup
bestSeenInMonth January
colorIndexBminusV −0.20
declination −01° 56′ 34″
distanceFromEarth_ly about 1260 light-years
distanceFromEarth_pc about 387 parsecs
effectiveTemperature_K about 29000
eponymLanguage Arabic
equatorialCoordinateSystem International Celestial Reference System
surface form: ICRS
galacticLatitude −16.0°
galacticLongitude 206.45°
hasBayerDesignation Zeta Orionis
hasBDDesignation +−01° 969
hasComponent Alnitak self-linksurface differs
surface form: Alnitak Aa

Alnitak self-linksurface differs
surface form: Alnitak Ab

Alnitak self-linksurface differs
surface form: Alnitak B

Alnitak self-linksurface differs
surface form: Alnitak C
hasFlamsteedDesignation 50 Orionis
hasHDDesignation HD 37742
hasHIPDesignation HIP 26727
hasHRDesignation HR 1948
hasNearbyObject Flame Nebula
surface form: Flame Nebula (NGC 2024)

Horsehead Nebula
surface form: Horsehead Nebula (Barnard 33)
hasSAODesignation SAO 132444
isIonizingSourceFor nearby emission nebulae
isPartOfAsterism Orion constellation
surface form: Orion's Belt
locatedInConstellation Orion
luminositySolar about 250000
massSolar about 33
nameEtymology derived from Arabic "al-niṭāq" meaning "the girdle" or "the belt"
parallax_mas 2.58
parallaxError_mas 0.39
positionInOrionsBelt easternmost star
properMotionDec_masPerYr +2.20
properMotionRA_masPerYr +3.01
radialVelocity_kmPerSec +16
radiusSolar about 20
rightAscension 05h 40m 45.5s
spectralType O9.5 Iab
variableType eclipsing variable candidate
visibleIn Northern Hemisphere
Southern Hemisphere

How these facts were elicited

Referenced by (7)

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

Orion hasStar Alnitak
subject surface form: Orion's Belt
Alnitak hasComponent Alnitak self-linksurface differs
this entity surface form: Alnitak Aa
Alnitak hasComponent Alnitak self-linksurface differs
this entity surface form: Alnitak Ab
Alnitak hasComponent Alnitak self-linksurface differs
this entity surface form: Alnitak B
Alnitak hasComponent Alnitak self-linksurface differs
this entity surface form: Alnitak C
Horsehead Nebula visibleNear Alnitak