อัลนิแทค

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.

คุณสมบัติทางกายภาพ

ประเภทสเปกตรัม O Class O — O-type (Blue)
ดัชนีสี (B−V) -0.199

การสังเกต

โชติมาตรปรากฏ +1.74
โชติมาตรสัมบูรณ์ -5.03
ระยะทาง 736 ly
กลุ่มดาว Orion

ตำแหน่ง

ไรต์แอสเซนชัน 5h 40.76m
เดคลิเนชัน -1° 56.55′

Frequently Asked Questions

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