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Zeta Orionis

Alnitak (Zeta Orionis)
Alnitak is the left-hand star in Orion's Belt. Image: NASA
The left hand star in Orion's Belt, the fifth brightest in the whole of Orion, and (in terms of apparent magnitude) the brightest O star in the sky.

ZETA ORIONIS
Zeta Orionis (Alnitak) is a star at the eastern end of Orion's belt (in the Orion). Alnitak means belt. Alnitak is spectral Type O9.7Ib. It is also known as Alnitah.

Zeta Orionis (1.9, 4.0) has a very slow orbit of 1509 years, and is currently at 165º and 2.3" separation.
Variable stars in Orion: ...

[5975] zeta Orionis or Alnitak ("the girdle") is a triple star with a hot blue supergiant, the brightest class O star in the sky, for a primary component. It is approximately 800 light-years distant.

ALNITAK (Zeta Orionis). With brilliant Betelgeuse and Rigel dominating great Orion, we pay little heed to the individual stars of the Hunter's belt except as a group, the trio the Arabs called the "string of pearls.

Alnitak - Zeta Orionis - The Girdle
Belt Stars of Orion
Orion has important mythological connections with the journey of humanity. Ancient Egyptians claimed their gods came from the Belt Stars of Orion, which were associated with Osiris.

Examples: Zeta Orionis, Zeta Puppis, Lambda Orionis, Delta Orionis
[edit] Class B
The Pleiades open star cluster with many bright B stars ...

Alnitak (Zeta Orionis) is a star at the eastern end of the Orion's belt (in the constellation Orion). Alnitak means belt. Alnitak is spectral Type O9.7Ib. It is also known as Alnitah. The other two stars in Orion's belt are Alnilam and Mintaka.

Subsequent observations of the "H" and "K" lines of calcium by Beals (1936) revealed double and asymmetric profiles in the spectra of Epsilon and Zeta Orionis.

Alnitak Zeta Orionis
Alniyat Tau Scorpii
Al Niyat Sigma Scorpii
Alphard Alpha Hydrae
Alphecca Alpha Coronae Borealis
Alpheratz Alpha Andromedae
Alrai Gamma Cephei
Alrakis Mu Draconis
Alrami Alpha Sagittarii
Alrischa Alpha Piscium ...

Alnitak (Zeta Orionis)
Pavo (Pavonis) Pegasus (Pegasi) Perseus (Persei) Phoenix (Phoenicis) Pictor (Pictoris) Pisces (Piscium) Piscis Austrinius (Piscis Austrini) Puppis (Puppis) Pyxis (Pyxidis) Reticulum ...