Orionis epsilon
Epsilon Orionis (ε Ori/ε Orionis) is large a star of the Constellation of Orion. It is also called by its traditional name, Alnilam which in Arabic means " row of perles". Its Désignation of Flamsteed is 46 Orionis .
It is the 30 {{E}} the most brilliant star in the sky (and 4th the most brilliant of Orion). Being a star Supergéante of blue-white color, it is one of star most luminous known. It is the star of the medium, in the Ceinture of Orion.
Alnilam is also one of 57 stars used in astronomical Navigation. For observers being located close to the Ecuador, it is located at highest in the sky the December 15th about midnight.
This star should reach the red stage of Supergéante and explode in Supernova. It is surrounded by a molecular Nuage, NGC 1990, which lights it to form a Nébuleuse by reflection. Its stellar winds can reach the 2000 km/s what causes losses of Masse 20 million times higher than those which undergone the Sun.
Designations
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Common nouns: Alnilam; Alnihan; Alnitam
- Designation of Bayer: ε Ori
- Designation of Flamsteed: 46 Orionis
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Harvard Revised Photometry: HR 1903
- Henry Catalog To drape: HD 37128
- Catalog SAO: SAO 132346
- Bonner Durchmusterung : Data base -01°969
- Fifth Fundamental Catalogs: FK5 210
- Catalog Hipparcos: HIP 26311
See too
- Nebulous Supernova
- by reflection
- Star supergéante
External bond
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