Alnitak A

Zeta1 Orionis


Distance (Light Years) 820 ± 160
Apparent Magnitude 1.74
Color (B-V)-0.21

Names For This Star

Another name for this star is Alnitah. The name of the star derives from the Arabic Al Nitak meaning "The Belt" or "The Girdle".

Description of the Star

Alnitak is a double star system. Alnitak A is a blue O9.7Ib supergiant star about 15 times the diameter of the sun, at least 11,000 times more luminous than the sun.

The companion is yellow in color. There is a third component, Alnitak C, almost one minute of arc away from A. This latter star, according to Burnham is probably not physically related to the A and B stars.

Other Designations For This Star


50 Orionis

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

BD-02 1338
Smithsonian Astrophysical
Observatory compendium (SAO Number)

Fundamental Katalog (FK5 Number)



Copyright © 1998 - 2010 by Arnold V. Lesikar,
Professor Emeritus
Dept. of Physics, Astronomy, and Engineering Science,
St. Cloud State University,St. Cloud, MN 56301-4498

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