アルニタク

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.

物理的特性

スペクトル型 O Class O — O-type (Blue)
色指数 (B−V) -0.199

観測

見かけの等級 +1.74
絶対等級 -5.03
距離 736 ly
星座 Orion

位置

赤経 5h 40.76m
赤緯 -1° 56.55′

Frequently Asked Questions

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