알니타크

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.

물리적 특성

분광형 O Class O — O-type (Blue)
색지수 (B−V) -0.199

관측

겉보기 등급 +1.74
절대 등급 -5.03
거리 736 ly
별자리 Orion

위치

적경 5h 40.76m
적위 -1° 56.55′

Frequently Asked Questions

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