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.

Sifat Fisik

Kelas Spektral O Class O — O-type (Blue)
Indeks Warna (B−V) -0,199

Pengamatan

Magnitudo Semu +1.74
Magnitudo Mutlak -5,03
Jarak 736 ly
Rasi Bintang Orion

Posisi

Asensio Rekta 5h 40,76m
Deklinasi -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.