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Proper Names	Hatysa, Nair al Saif
Bayer Designation	Iota Orionis
Flamsteed Number	44 Orionis
HR (BSC)	1899
HD	37043
Constellation	Orion
Right Ascension	5h 35m 26s
Declination	-5° 54' 36"
Distance	c.2,300 light years c.700 parsecs
Magnitude	Apparent: +2.8 Absolute: -6.5
Spectral Class	O9III Blue-white Giant
Optimum Visibility	December / January
Notes	Part 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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