Omega Scorpii

ω¹ Scorpii
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Scorpius
Right ascension 16h 06m 48.4s
Declination −20° 40' 9"
Apparent magnitude (V) +3.93
Distance424 ± 48 ly
(130 ± 15 pc)
Spectral typeB1V
Other designations
Jabhat al Akrab, 9 Scorpii, HR 5993, HD 144470, HIP 78933

The Bayer designation Omega Scorpii (ω Sco, ω Scorpii) is shared by two stars, ω¹ Scorpii and ω² Scorpii, in the constellation Scorpius. They are separated by 0.24° on the sky. Omega Scorpii also has the traditional name Jabhat al Akrab, which is derived from the Arabic جبهة العقرب jabhat[u] al-caqrab meaning "[The] forehead of the scorpion".

ω¹ Scorpii

Omega-1 Scorpii is a blue-white B-type dwarf with an apparent magnitude of +3.93. It is approximately 424 light years from Earth.

Omega-1 Sco is one of the most massive members of the Upper Scorpius subgroup of the Scorpius-Centaurus Association, a group of thousands of young stars with mean age 11 million years at distance 470 light years (145 parsecs).[1] A recent analysis of the HR diagram position for the star[1] estimates its effective temperature to be 26,550 Kelvin with a luminosity of 9,120 Suns, consistent with an isochronal age of 5 million years and an estimated mass of 11 solar masses.

ω² Scorpii

ω² Scorpii
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Scorpius
Right ascension 16h 07m 24.3s
Declination −20° 52' 8"
Apparent magnitude (V) +4.31
Distance265 ± 19 ly
(81 ± 6 pc)
Spectral typeG3II-III
Other designations
Jabhat al Akrab, 10 Scorpii, HR 5997, HD 144608, HIP 78990

Omega-2 Scorpii is a yellow G-type bright giant with an apparent magnitude of +4.31. It is approximately 265 light years from Earth.

References


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