Alnitak

50Zet Ori

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Alnitak is a rare O-type star, the hottest spectral class, its blue colour matched by a negative B–V index of −0.199. Designated Zeta Orionis, it forms the easternmost star of Orion's Belt and lies about 736 light-years away. At apparent magnitude 1.74 it is the brightest O-type star of the night sky, and its absolute magnitude of −5.03 marks an intrinsic luminosity thousands of times the Sun's. A near-equatorial declination of −1° makes Alnitak visible worldwide, where it anchors one end of the Belt that makes Orion among the most readily recognised constellations.

Propriétés physiques

Classe Spectrale O Class O — O-type (Blue)
Indice de couleur (B−V) -0,199

Observation

Magnitude Apparente +1.74
Magnitude Absolue -5,03
Distance 736 ly
Constellation Orion

Position

Ascension droite 5h 40,76m
Déclinaison -1° 56,55′

Frequently Asked Questions

What type of star is Alnitak?
Alnitak is a Class O — O-type (Blue) star.
How far is Alnitak from Earth?
Alnitak is approximately 736.2 light-years from Earth.
Can you see Alnitak with the naked eye?
With an apparent magnitude of 1.74, Alnitak is visible to the naked eye.
What constellation is Alnitak in?
Alnitak is located in the constellation Orion.