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Alnilam

Epsilon Orionis, 46 Orionis

Proper NameAlnilam
Bayer DesignationEpsilon Orionis
Flamsteed Number46 Orionis
BSC1903
HD37128
ConstellationOrion
Right Ascension5h 37m 0s
Declination-1° 11' 44"
Distancec.1,342 light years
c.412 parsecs
MagnitudeApparent: +1.7 to +0.6
Absolute: -6.4
Spectral ClassB0 Blue Supergiant
Optimum VisibilityDecember / January
Location of Alnilam

Alnilam lies at the centre of the richly starred region of Orion, forming the 'buckle' on Orion's prominent Belt.

The buckle on Orion's Belt - the central of the three famous stars that cross the central parts of Orion. Alnilam is a blue supergiant, a massive and hot star. It lies close to the dense Orion Molecular Cloud, and brightens part of this cloud to form its own reflection nebula, catalogued as NGC 1990.

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