Segin, a blue main-sequence star in Cassiopeia
Segin is a blue main-sequence star in the constellation Cassiopeia. At 410 light years away, it is the 245th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.35.
Segin (HIP 8886)
Segin is a blue main-sequence star in the constellation Cassiopeia. At 410 light years away, it is the 245th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.35. It is moving through the Galaxy at a speed of 23.7 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,500 and 24,400 light years from the center of the Galaxy.
Sky position: RA 1h 54.4m, Dec +63° 40.2'
Common designations: Segin, Epsilon Cassiopeiae, 45 Cassiopeiae, HIP 8886, HD 11415
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Brightest stars in Cassiopeia:
(list all)
| Rank | Mag. | Star |
| 1 | 2.15 | Gamma Cassiopeiae |
| 2 | 2.24 | Schedar |
| 3 | 2.28 | Caph |
| 4 | 2.66 | Ruchbah |
5
| 3.35
) Segin
| Rank | Mag. | Star |
| 6 | 3.46 | Eta Cassiopeia |
| 7 | 3.69 | Zeta Cassiopeiae |
| 8 | 3.95 | 50 Cassiopeiae |
| 9 | 4.17 | Kappa Cassiopeiae |
| 10 | 4.34 | Marfak |
| 11 | 4.46 | Iota Cassiopeiae |
| 12 | 4.48 | Omicron Cassiopeiae |
| 13 | 4.49 | A Cassiopeiae |
| 14 | 4.51 | Rho Cassiopeiae |
| 15 | 4.62 | Upsilon-2 Cassiopeiae |
| 16 | 4.68 | Chi Cassiopeiae |
| 17 | 4.72 | Psi Cassiopeiae |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Segin
(compared to the Sun)
E
ccentricity: 4.0% vs. 16.0%Angle φ : -180.0°vs. 26.0°
Semi-major axis : 7,195 pc vs. 8,686 pc
Semi-minor axis: 7,189 pc vs. 8,574 pc
Focus-to-center
: 287 pcvs. 1,388 pcSemilatus rectum : 7,183 pc vs. 8,464 pc
Perigalacticon: 6,908 pc vs. 7,297 pc
Apogalacticon
: 7,481 pcvs. 10,074 pcSome Tabulated XHIP Data for Segin
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 28.59868112° ±0.23 mas | 32.09 ±0.29 mas/yr. |
| Declination: | 63.67014682° ±0.29 mas | -18.94 ±0.37 mas/yr. |
| Galactic Longitude: | 129.84499925° | 35.71 mas/yr. |
| Galactic Latitude: | 1.64659649° | -10.63 mas/yr. |
Parallax: 7.92 ± 0.43 mas
Spectrography
Spectral Type: B3V 1982ApJS...50...55S.
Radial Velocity: -8.30 ±0.80 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
2.61
-2.89
B
3.20
-2.30
V
3.35
-2.15
R
I
3.45
-2.05
J
3.86
-1.63
H
3.93
-1.56
K
3.96
-1.54
B-V: -0.15 V-I: -0.10
Derivations
Heliocentric distance: 125.82 pc (5.4% margin of error)
Galactocentric distance: 7,481 pc
Transverse velocity: 22.2 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -80.6 pc | 96.6 pc | 3.6 pc |
| Velocity (U, V, W) | -11.2 km/s | -19.9 km/s | -6.6 km/s |