Seginus, a white subgiant star in Boötes

Seginus (HIP 71075)

Seginus is a white subgiant star in the constellation Boötes. At 87 light years away, it is the 184th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.04. Seginus is the primary component of a multiple-star system. The iron abundance of Seginus is -0.2 (63.1% of the Sun). It is moving through the Galaxy at a speed of 40.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,300 and 28,300 light years from the center of the Galaxy. It will come closest to the Sun 518,000 years from now when it will brighten to magnitude 1.91 from a distance of 52 light years.

Sky position: RA 14h 32.1m, Dec +38° 18.6'

Common designations: Seginus, Gamma Boötis, 27 Boötis, HIP 71075, HD 127762, HR 5435

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Stars of the Northern Hemisphere
Deluxe Astronomy Poster Brightest stars in Boötes:
(list all)

| -0.05

) Arcturus

Rank	Mag.	Star
2	2.35	Izar
3	2.68	Mufrid

| 3.04

) Seginus

Rank	Mag.	Star
5	3.46	Princeps
6	3.49	Nekkar
7	3.57	Rho Boötis
8	3.78	Zeta Boötis
9	4.04	Asellus Primus
10	4.05	Upsilon Boötis
11	4.18	Lambda Boötis
12	4.31	Alkalurops
13	4.47	Sigma Boötis
14	4.49	Pi-1 Boötis
15	4.50	Tau Boötis
16	4.52	Psi Boötis
17	4.53	Asellus Tertius

Location of Seginus circled Map detail from Stars of the Northern Hemisphere
Hover over other bright stars to identify or click to jump.

Galactic Orbit of Seginus
(compared to the Sun)

ccentricity: 9.5% vs. 16.0%

Angle φ : -50.9°vs. 26.0°

Semi-major axis : 7,913 pc vs. 8,686 pc

Semi-minor axis: 7,877 pc vs. 8,574 pc

Focus-to-center

: 755 pcvs. 1,388 pc

Semilatus rectum : 7,841 pc vs. 8,464 pc

Perigalacticon: 7,158 pc vs. 7,297 pc

Apogalacticon

: 8,667 pcvs. 10,074 pc
Some Tabulated XHIP Data for Seginus
(see also: SIMBAD)

Astrometry
2007A&A...474..653V

Position	Proper Motion
Right Ascension:	218.01982423° ±0.08 mas	-115.71 ±0.10 mas/yr.
Declination:	38.30788378° ±0.10 mas	151.16 ±0.11 mas/yr.
Galactic Longitude:	67.26213917°	182.12 mas/yr.
Galactic Latitude:	66.17227146°	55.41 mas/yr.

Parallax: 37.58 ± 0.14 mas

Spectrography

Spectral Type: A7IV+(n) 2001AJ....121.2148G.

Radial Velocity: -32.40 ±1.00 km/s [A rating] 2006AstL...32..759G.

Iron Abundance [Fe/H]: -0.20 dex 2003A&A...398.1121E.

Photometry

band	magnitude	Abs. Mag.
U
B	3.23	1.11
V	3.04	0.91
R	2.90	0.77
I	2.80	0.67
J	2.65	0.52
H	2.57	0.45
K	2.51	0.39

B-V: +0.19 V-I: +0.24

Derivations

Heliocentric distance: 26.61 pc (0.4% margin of error)

Galactocentric distance: 7,396 pc

Transverse velocity: 24.0 km/s

3D heliocentric position and motion:

toward:	Galactic center	Galactic rotation	North Galactic Pole
Position ( X, Y, Z)	4.2 pc	9.9 pc	24.3 pc
Velocity (U, V, W)	-28.7 km/s	-9.1 km/s	-26.8 km/s