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Zodiac: Sagittarius
Nov 23 - Dec 21
Read more about Sagittarius.
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Alnitak (ζ Orionis)

Alnitak (ζ Orionis) is a rare hot blue-white star (O9.5Ib SB) in the constellation of Orion.
This triple star system is located right next to the Flame Nebula (NGC2024). It consists of two close binary components and a third star, Alnitak (ζ Orionis). It is one of the three belt stars in the famous constellation Orion.
Alnitak is a rare hot blue-white star, which shines about 10.000 times brighter than our own Sun. Its diameter is about 20 times that of our Sun, which makes it a real giant. Its surface temperature measures at around 25.000 degrees Celsius. This is extremely hot compared to our own Sun which reaches only around 5.500 degrees Celsius.
Right ascension
5h 40m 45.52s (85.18968°)
The magnitude (brightness) is measured on a logarithmic scale. Small numbers mean bright stars: A star with a brightness of 1 mag is 100 times brighter that an star with 6 mag.
1.89 mag
The distance is measured in light years (LY). A light year is the distance, that light travels within one year. 1 LJ is equal to about 5,878,630,000,000 miles.
817.4817.4 ly
Spectral type
O9.5Ib SB
Color index
Every star belongs to a constellation, and 12 of those constellations are part of the zodiac.
Orion (Orion)
Photograph of Alnitak next to the Flame Nebula (NGC2024).
Image credit: Two Micron All Sky Survey (2MASS) project
License: Public Domain
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