1 Scorpii, a blue main-sequence star in Scorpius
1 Scorpii is a blue main-sequence star in the constellation Scorpius. At 494 light years away, it shines at an apparent visual magnitude of 4.63.
1 Scorpii (HIP 77635)
1 Scorpii is a blue main-sequence star in the constellation Scorpius. At 494 light years away, it shines at an apparent visual magnitude of 4.63. It is moving through the Galaxy at a speed of 20.9 km/s relative to the Sun. Its projected Galactic orbit carries it between 20,700 and 24,000 light years from the center of the Galaxy.
Sky position: RA 15h 51.0m, Dec -25° 45'
Common designations: b Scorpii, 1 Scorpii, HIP 77635, HD 141637, HR 5885
Brightest stars in Scorpius:
(list all)
| Rank | Mag. | Star |
| 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 |
| 25 | 4.55 | Omicron Scorpii |
| 26 | 4.58 | 13 Scorpii |
| 27 | 4.59 | A Scorpii |
28
| 4.63
) 1 Scorpii
| Rank | Mag. | Star |
| 29 | 4.70 | Grafias |
| 30 | 4.78 | Iota-2 Scorpii |
| 31 | 4.79 | 22 Scorpii |
| 32 | 4.79 | HR 6628 |
| 33 | 4.80 | d Scorpii |
| 34 | 4.83 | k Scorpii |
| 35 | 4.85 | HR 6675 |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of 1 Scorpii
(compared to the Sun)
E
ccentricity: 7.4% vs. 16.0%Angle φ : 143.6°vs. 26.0°
Semi-major axis : 6,868 pc vs. 8,686 pc
Semi-minor axis: 6,849 pc vs. 8,574 pc
Focus-to-center
: 510 pcvs. 1,388 pcSemilatus rectum : 6,830 pc vs. 8,464 pc
Perigalacticon: 6,358 pc vs. 7,297 pc
Apogalacticon
: 7,377 pcvs. 10,074 pcSome Tabulated XHIP Data for 1 Scorpii
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 237.74480716° ±0.23 mas | -14.10 ±0.31 mas/yr. |
| Declination: | -25.75123475° ±0.14 mas | -25.06 ±0.25 mas/yr. |
| Galactic Longitude: | 346.09796042° | -27.33 mas/yr. |
| Galactic Latitude: | 21.70593115° | -8.94 mas/yr. |
Parallax: 6.59 ± 0.27 mas
Spectrography
Spectral Type: B1.5 VN 1988MSS...C04....0H.
Radial Velocity: -3.00 ±4.70 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
3.84
-2.06
B
4.56
-1.34
V
4.63
-1.27
R
I
4.67
-1.23
J
4.80
-1.10
H
4.86
-1.04
K
4.78
-1.12
B-V: -0.07 V-I: -0.04
Derivations
Heliocentric distance: 151.44 pc (4.1% margin of error)
Galactocentric distance: 7,264 pc
Transverse velocity: 20.6 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 136.6 pc | -33.8 pc | 56.0 pc |
| Velocity (U, V, W) | -5.1 km/s | -18.9 km/s | -7.1 km/s |