Alnitak is a triple star system at the eastern end of Orion's Belt, the second-magnitude primary having a 4th-magnitude companion nearly 3 arcseconds distant, in an orbit taking over 1,500 years. The part called Alnitak A is itself a close binary, comprising the stars Alnitak Aa …

2019年9月7日 · Alnitak, Zeta Orionis (ζ Ori), is a triple star system with a combined apparent magnitude of 1.77. It lies at an approximate distance of 1,260 light years from Earth in the constellation Orion. Alnitak is the 5th brightest star in Orion and the 31st brightest star in the sky. It shares the 31s place with Alioth, the brightest star in Ursa Major.

Alnitak (ζ Orionis) is a triple star system at the eastern end of Orion's belt and is 1,260 light-years from the Earth. Alnitak B is a 4th-magnitude B-type star which orbits Alnitak A every 1,500 years.

2020年1月30日 · Alnitak - also called Zeta Orionis and 50 Orionis, is a triple star system in the constellation of Orion. It is one of the three main stars forming Orion’s Belt. Alnitak is the 5 th brightest star in its constellation and the 31 st brightest star in the night sky.

2017年7月12日 · Alnitak (Zeta Orionis) is a blue supergiant star in the Orion constellation, and forms part of the Hunter’s Belt along with the stars Alnilam and Mintaka. It is also the brightest O-type star in the entire night sky, with an apparent visual magnitude of +2.0.

2023年4月10日 · Its leftmost star, Alnitak (pronounced ALL-nye-tack), is our focus this month. Alnitak is blue because it’s hotter than most stars. And boy, is it hot, shining at visible wavelengths with the...

2016年4月15日 · Alnitak is the brightest class O star in the night sky, shining with an apparent visual magnitude of 1.74. It is 33 times bigger than the Sun, 20 times its diameter and shines 10,000 times its luminosity.

Alnitak, also designated as ζ Orionis (zeta Orionis), is a variable and multiple supergiant star of spectral class O9 in the constellation of Orion. Alnitak visual magnitude is 2.05, making it the 52th brightest star in the sky.

Alnitak approaches first magnitude even though at a distance of 800 light years. To the eye (ignoring the companion), it is 10,000 times more luminous than the Sun. However, its 31,000 Kelvin surface radiates mostly in the ultraviolet where the eye cannot see, and when that it taken into account, Alnitak's luminosity climbs to 100,000 times solar.

Alnitak Aa is the primary star and is a hot blue supergiant and the brightest Class O star in the sky. Based on its spectral type 09.5lB SB supergiant star, it is classified as a luminous blue-white supergiant star. This makes it one of the hottest stars in the universe.