Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Scorpius |
Right ascension | 16h 07m 24.32818s [1] |
Declination | −20° 52′ 07.5518″ [1] |
Apparent magnitude (V) | +4.320 [2] |
Characteristics | |
Evolutionary stage | horizontal branch [3] |
Spectral type | G6/8III [4] |
U−B color index | +0.494 [2] |
B−V color index | +0.850 [2] |
Astrometry | |
Radial velocity (Rv) | −5.4 [5] km/s |
Proper motion (μ) |
RA: +44.81
[1]
mas/
yr Dec.: −45.42 [1] mas/ yr |
Parallax (π) | 11.22 ± 0.32 mas [1] |
Distance | 291 ± 8
ly (89 ± 3 pc) |
Absolute magnitude (MV) | −0.62 [6] |
Details | |
Mass | 3.27 [6] M☉ |
Radius | 15.0 [7] R☉ |
Luminosity | 163 [7] L☉ |
Surface gravity (log g) | 2.62±0.11 [8] cgs |
Temperature | 5,363±42 [8] K |
Metallicity [Fe/H] | +0.03±0.05 [8] dex |
Age | 282 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
ω2 Scorpii, Latinised as Omega2 Scorpii, is a suspected [11] 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. [2] The distance to this star, as determined using parallax measurements, [1] is around 291 light years. The visual magnitude of this star is reduced by 0.38 because of extinction from interstellar dust. [6]
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. [4] With an estimated age of 282 million years, [6] it is an evolved, thin disk star that is currently on the red horizontal branch. [3] The interferometry-measured angular diameter of this star is 1.63 ± 0.10 mas, [12] which, at its estimated distance, equates to a physical radius of nearly 16 times the radius of the Sun. [13] It has 3.27 times the mass of the Sun, [6] and radiates 141 times the Sun's luminosity [14] The effective temperature of the star's outer atmosphere is 5,363 K. [8]
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. [15] (The IAU used a version of this story from Tahiti to name Mu2 Scorpii.)
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Scorpius |
Right ascension | 16h 07m 24.32818s [1] |
Declination | −20° 52′ 07.5518″ [1] |
Apparent magnitude (V) | +4.320 [2] |
Characteristics | |
Evolutionary stage | horizontal branch [3] |
Spectral type | G6/8III [4] |
U−B color index | +0.494 [2] |
B−V color index | +0.850 [2] |
Astrometry | |
Radial velocity (Rv) | −5.4 [5] km/s |
Proper motion (μ) |
RA: +44.81
[1]
mas/
yr Dec.: −45.42 [1] mas/ yr |
Parallax (π) | 11.22 ± 0.32 mas [1] |
Distance | 291 ± 8
ly (89 ± 3 pc) |
Absolute magnitude (MV) | −0.62 [6] |
Details | |
Mass | 3.27 [6] M☉ |
Radius | 15.0 [7] R☉ |
Luminosity | 163 [7] L☉ |
Surface gravity (log g) | 2.62±0.11 [8] cgs |
Temperature | 5,363±42 [8] K |
Metallicity [Fe/H] | +0.03±0.05 [8] dex |
Age | 282 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
ω2 Scorpii, Latinised as Omega2 Scorpii, is a suspected [11] 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. [2] The distance to this star, as determined using parallax measurements, [1] is around 291 light years. The visual magnitude of this star is reduced by 0.38 because of extinction from interstellar dust. [6]
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. [4] With an estimated age of 282 million years, [6] it is an evolved, thin disk star that is currently on the red horizontal branch. [3] The interferometry-measured angular diameter of this star is 1.63 ± 0.10 mas, [12] which, at its estimated distance, equates to a physical radius of nearly 16 times the radius of the Sun. [13] It has 3.27 times the mass of the Sun, [6] and radiates 141 times the Sun's luminosity [14] The effective temperature of the star's outer atmosphere is 5,363 K. [8]
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. [15] (The IAU used a version of this story from Tahiti to name Mu2 Scorpii.)