Omega-2 Scorpii, a yellow bright giant star in Scorpius
Omega-2 Scorpii is a yellow bright giant star in the constellation Scorpius. At 290 light years away, it shines at an apparent visual magnitude of 4.31.
Omega-2 Scorpii (HIP 78990)
Omega-2 Scorpii is a yellow bright giant star in the constellation Scorpius. At 290 light years away, it shines at an apparent visual magnitude of 4.31. The iron abundance of Omega-2 Scorpii is -0.04 (91.2% of the Sun). It is moving through the Galaxy at a speed of 27.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,100 and 31,700 light years from the center of the Galaxy.
Sky position: RA 16h 7.4m, Dec -20° 52.2'
Common designations: Omega-2 Scorpii, 10 Scorpii, HIP 78990, HD 144608, HR 5997
Brightest stars in Scorpius:
(list all)
| Rank | Mag. | Star |
| 15 | 3.32 | Eta Scorpii |
| 16 | 3.56 | Mu-2 Scorpii |
| 17 | 3.62 | Grafias |
| 18 | 3.87 | Rho Scorpii |
| 19 | 3.93 | Omega-1 Scorpii |
| 20 | 4.00 | Jabbah |
| 21 | 4.18 | H Scorpii |
| 22 | 4.24 | N Scorpii |
| 23 | 4.26 | Q Scorpii |
24
| 4.31
) Omega-2 Scorpii
| Rank | Mag. | Star |
| 25 | 4.55 | Omicron Scorpii |
| 26 | 4.58 | 13 Scorpii |
| 27 | 4.59 | A Scorpii |
| 28 | 4.63 | 1 Scorpii |
| 29 | 4.70 | Grafias |
| 30 | 4.78 | Iota-2 Scorpii |
| 31 | 4.79 | 22 Scorpii |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Omega-2 Scorpii
(compared to the Sun)
E
ccentricity: 15.7% vs. 16.0%Angle φ : 39.3°vs. 26.0°
Semi-major axis : 8,416 pc vs. 8,686 pc
Semi-minor axis: 8,311 pc vs. 8,574 pc
Focus-to-center
: 1,322 pcvs. 1,388 pcSemilatus rectum : 8,208 pc vs. 8,464 pc
Perigalacticon: 7,094 pc vs. 7,297 pc
Apogalacticon
: 9,738 pcvs. 10,074 pcSome Tabulated XHIP Data for Omega-2 Scorpii
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 241.85125085° ±0.28 mas | 44.72 ±0.28 mas/yr. |
| Declination: | -20.86865400° ±0.18 mas | -45.33 ±0.21 mas/yr. |
| Galactic Longitude: | 352.69659553° | -2.26 mas/yr. |
| Galactic Latitude: | 22.53440062° | -63.64 mas/yr. |
Parallax: 11.22 ± 0.32 mas
Spectrography
Spectral Type: G4II-III 1989ApJS...71..245K.
Radial Velocity: -4.80 ±0.30 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
-0.04 dex
2007A&A...475.1003H.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 5.14 | 0.39 |
| V | 4.31 | -0.44 |
| R | ||
| I | 3.56 | -1.18 |
| J | 2.89 | -1.86 |
| H | 2.53 | -2.21 |
| K | 2.47 | -2.28 |
B-V: +0.83 V-I: +0.75
Derivations
Heliocentric distance: 89.04 pc (2.9% margin of error)
Galactocentric distance: 7,319 pc
Transverse velocity: 26.9 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 81.6 pc | -10.5 pc | 34.1 pc |
| Velocity (U, V, W) | 5.7 km/s | -1.7 km/s | -26.7 km/s |