Izar, a yellow bright giant star in Boötes
Izar is a yellow bright giant star in the constellation Boötes. At 202 light years away, it is the 82nd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 2.35.
Izar (HIP 72105)
Izar is a yellow bright giant star in the constellation Boötes. At 202 light years away, it is the 82nd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 2.35. Izar is a multiple-star system. It is moving through the Galaxy at a speed of 20.8 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,000 and 26,300 light years from the center of the Galaxy. It will come closest to the Sun 2.3 million years from now when it will brighten to magnitude 1.34 from a distance of 127 light years.
Sky position: RA 14h 45.0m, Dec +27° 4.2'
Common designations: Izar, Epsilon Boötis, 36 Boötis, HIP 72105, HD 129988
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Brightest stars in Boötes:
(list all)
1
| -0.05
) Arcturus
2
| 2.35
) Izar
| Rank | Mag. | Star |
| 3 | 2.68 | Mufrid |
| 4 | 3.04 | Seginus |
| 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 |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Izar
(compared to the Sun)
E
ccentricity: 4.4% vs. 16.0%Angle φ : -16.2°vs. 26.0°
Semi-major axis : 7,710 pc vs. 8,686 pc
Semi-minor axis: 7,703 pc vs. 8,574 pc
Focus-to-center
: 343 pcvs. 1,388 pcSemilatus rectum : 7,695 pc vs. 8,464 pc
Perigalacticon: 7,367 pc vs. 7,297 pc
Apogalacticon
: 8,053 pcvs. 10,074 pcSome Tabulated XHIP Data for Izar
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 221.24687848° ±0.42 mas | -42.20 ±2.20 mas/yr. |
| Declination: | 27.07417376° ±0.37 mas | 13.60 ±2.20 mas/yr. |
| Galactic Longitude: | 39.38458471° | 8.59 mas/yr. |
| Galactic Latitude: | 64.78406061° | 43.50 mas/yr. |
Parallax: 16.10 ± 0.66 mas
Spectrography
Spectral Type: G9II-III 1995ApJS...99..135A.
Radial Velocity: -16.20 ±0.40 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
B
3.32
-0.65
V
2.35
-1.61
R
I
1.52
-2.44
J
H
K
B-V: +0.97 V-I: +0.83
Derivations
Heliocentric distance: 61.99 pc (4.1% margin of error)
Galactocentric distance: 7,380 pc
Transverse velocity: 13.0 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 20.4 pc | 16.8 pc | 56.1 pc |
| Velocity (U, V, W) | -15.9 km/s | -9.8 km/s | -9.2 km/s |