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Omega¹ Scorpii

9 Scorpii

Blue Star in Scorpius

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Proper Name	None
Bayer Designation	Omega¹ Scorpii
Flamsteed Number	9 Scorpii
HR (BSC)	5993
HD	144470
Constellation	Scorpius
Right Ascension	16h 6m 48s
Declination	-20° 40' 9"
Distance	471 light years 145 parsecs
Magnitude	Apparent: +4.0 Absolute: -1.9
Spectral Class	B1V Blue Dwarf
Optimum Visibility	June
Notes	This is a highly luminous blue dwarf star, though its distance from Earth, and a drift of intervening galactic dust, lessen its apparent brightness somewhat. It is one of more than four hundred stars belonging to the widespread Scorpius-Centaurus Association running through this part of the sky.

Omega¹ Scorpii is the blue star centred in this image, and its yellow-white companion to the southeast is Omega² Scorpii. While the two stars are just a quarter of a degree apart as seen from Earth, they are widely separated in space, with blue Omega¹ falling almost twice as far from the Sun than the closer but less luminous yellow Omega². Imagery provided by Aladin sky atlas

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