Stellar classification



  • X 318
  • Y -203
  • Z -632
→ Sol: 736

Object type

  • Double or multiple star
  • Star
  • Emission-line Star
  • Infra-Red source
  • UV-emission source
  • Variable Star
  • X-ray source
simbad:* zet Ori


Alnitak, designated Zeta Orionis (ζ Orionis, abbreviated Zeta Ori, ζ Ori) and 50 Orionis (50 Ori), is a multiple star several hundred parsecs from the Sun in the constellation of Orion. It is part of Orion's Belt along with Alnilam and Mintaka.

The primary star is a hot blue supergiant with an absolute magnitude of -6.0 and is the brightest class O star in the night sky with a visual magnitude of +2.0. It has two bluish 4th magnitude companions, one finely resolved and one only detected interferometrically and spectroscopically, producing a combined magnitude for the trio of +1.77. The stars are members of the Orion OB1 association and the Collinder 70 association.

This article uses material from the Wikipedia article "Alnitak", which is released under the Creative Commons Attribution-Share-Alike License 3.0.