Epoch J2000.0 Equinox J2000.0
|Right ascension||16h 07m 24.32818s|
|Declination||−20° 52′ 07.5518″|
|Apparent magnitude (V)||+4.320|
|U−B color index||+0.494|
|B−V color index||+0.850|
|Radial velocity (Rv)||−5.4 km/s|
|Proper motion (μ)|| RA: +44.81 mas/yr |
Dec.: −45.42 mas/yr
|Parallax (π)||11.22 ± 0.32 mas|
|Distance||291 ± 8 ly |
(89 ± 3 pc)
|Absolute magnitude (MV)||−0.62|
|Surface gravity (log g)||2.62±0.11 cgs|
|Metallicity [Fe/H]||+0.03±0.05 dex|
ω2 Scorpii, Latinised as Omega2 Scorpii, is a suspected variable star in the zodiac constellation of Scorpius. A component of the visual double star ω Scorpii, it is bright enough to be seen with the naked eye having an apparent visual magnitude of +4.320. The distance to this star, as determined using parallax measurements, is around 291 light years. The visual magnitude of this star is reduced by 0.38 because of extinction from interstellar dust.
It is 0.05 degree north of the ecliptic, so can be occulted by the moon and planets.
This is a G-type giant star with a stellar classification of G6/8III. With an estimated age of 282 million years, it is an evolved, thin disk star that is currently on the red horizontal branch. The interferometry-measured angular diameter of this star is 1.63 ± 0.10 mas, which, at its estimated distance, equates to a physical radius of nearly 16 times the radius of the Sun. It has 3.27 times the mass of the Sun, and radiates 141 times the Sun's luminosity The effective temperature of the star's outer atmosphere is 5,363 K.
In the Cook Islands, a traditional story is told of twins who flee their parents into the sky and become the pair of stars Omega2 and Omega1 Scorpii. The girl, who is called Piri-ere-ua "Inseparable", keeps tight hold of her brother, who is not named. (The IAU used a version of this story from Tahiti to name Mu2 Scorpii.)