Omega-1 Scorpii, a blue main-sequence star in Scorpius
Omega-1 Scorpii is a blue main-sequence star in the constellation Scorpius. At 470 light years away, it is the 483rd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.93.
Omega-1 Scorpii (HIP 78933)
Omega-1 Scorpii is a blue main-sequence star in the constellation Scorpius. At 470 light years away, it is the 483rd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.93. It is moving through the Galaxy at a speed of 17.7 km/s relative to the Sun. Its projected Galactic orbit carries it between 21,800 and 24,400 light years from the center of the Galaxy.
Sky position: RA 16h 6.8m, Dec -20° 40.2'
Common designations: Omega-1 Scorpii, 9 Scorpii, HIP 78933, HD 144470, HR 5993
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Brightest stars in Scorpius:
(list all)
| Rank | Mag. | Star |
| 10 | 2.89 | Pi Scorpii |
| 11 | 2.90 | Alniyat |
| 12 | 2.99 | Iota-1 Scorpii |
| 13 | 3.00 | Mu-1 Scorpii |
| 14 | 3.19 | G Scorpii |
| 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
| Rank | Mag. | Star |
| 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 |
| 25 | 4.55 | Omicron Scorpii |
| 26 | 4.58 | 13 Scorpii |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Omega-1 Scorpii
(compared to the Sun)
E
ccentricity: 5.7% vs. 16.0%Angle φ : 119.1°vs. 26.0°
Semi-major axis : 7,089 pc vs. 8,686 pc
Semi-minor axis: 7,077 pc vs. 8,574 pc
Focus-to-center
: 406 pcvs. 1,388 pcSemilatus rectum : 7,066 pc vs. 8,464 pc
Perigalacticon: 6,683 pc vs. 7,297 pc
Apogalacticon
: 7,495 pcvs. 10,074 pcSome Tabulated XHIP Data for Omega-1 Scorpii
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 241.70180217° ±0.22 mas | -8.98 ±0.23 mas/yr. |
| Declination: | -20.66913466° ±0.14 mas | -23.48 ±0.16 mas/yr. |
| Galactic Longitude: | 352.74977160° | -23.23 mas/yr. |
| Galactic Latitude: | 22.77299281° | -9.60 mas/yr. |
Parallax: 6.92 ± 0.26 mas
Spectrography
Spectral Type: B1 V 1988MSS...C04....0H.
Radial Velocity: -4.40 ±3.00 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
3.08
-2.72
B
3.88
-1.91
V
3.93
-1.87
R
I
3.93
-1.86
J
4.16
-1.64
H
4.19
-1.61
K
4.01
-1.79
B-V: -0.05 V-I: 0.00
Derivations
Heliocentric distance: 144.26 pc (3.8% margin of error)
Galactocentric distance: 7,268 pc
Transverse velocity: 17.2 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 132.0 pc | -16.8 pc | 55.8 pc |
| Velocity (U, V, W) | -3.5 km/s | -15.6 km/s | -7.8 km/s |