Zeta Orionis

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.

Propriedades físicas

Classe Espectral O Class O — O-type (Blue)
Índice de cor (B−V) -0,199

Observação

Magnitude Aparente +1.74
Magnitude Absoluta -5,03
Distância 736 ly
Constelação Orion

Posição

Ascensão reta 5h 40,76m
Declinação -1° 56,55′

Frequently Asked Questions

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