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Nair al Saif, Iota Orionis, 44 Orionis

Proper NamesHatysa, Nair al Saif
Bayer DesignationIota Orionis
Flamsteed Number44 Orionis
HR (BSC)1899
Right Ascension5h 35m 26s
Declination-5° 54' 36"
Distancec.2,300 light years
c.700 parsecs
MagnitudeApparent: +2.8
Absolute: -6.5
Spectral ClassO9III Blue-white Giant
Optimum VisibilityDecember / January
NotesPart of the Sword of Orion, the Hatysa system contains four stars. At its heart is a binary system composed of two hot giant stars, with two other stars pursuing more distant orbits around them. The entire system forms part of the nebulous open cluster sometimes called the Lost Jewel of Orion, and designated NGC 1980.

A very hot blue-white star in the constellation Orion. It is very distant, at more than 2,000 light years, and appears to be related to the Orion Nebula.


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