Etamin, an orange giant star in Draco
Etamin is an orange giant star in the constellation Draco. At 154 light years away, it is the 73rd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 2.24.
Etamin (HIP 87833)
Etamin is an orange giant star in the constellation Draco. At 154 light years away, it is the 73rd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 2.24. Etamin is the primary component of a multiple-star system. The iron abundance of Etamin is -0.13 (74.1% of the Sun). It is moving through the Galaxy at a speed of 28.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 19,400 and 24,500 light years from the center of the Galaxy. It will come closest to the Sun 1.6 million years from now when it will brighten to magnitude -1.35 from a distance of 30 light years.
Sky position: RA 17h 56.6m, Dec +51° 29.4'
Common designations: Etamin, Gamma Draconis, 33 Draconis, HIP 87833, HD 164058, HR 6705
Splendors of the Universe
Magnificent Monthly Calendar
Brightest stars in Draco:
(list all)
1
| 2.24
) Etamin
| Rank | Mag. | Star |
| 2 | 2.73 | Eta Draconis |
| 3 | 2.79 | Rastaban |
| 4 | 3.07 | Altais |
| 5 | 3.17 | Aldhibah |
| 6 | 3.29 | Ed Asich |
| 7 | 3.55 | Chi Draconis |
| 8 | 3.67 | Thuban |
| 9 | 3.73 | Grumium |
| 10 | 3.82 | Gianfar |
| 11 | 3.84 | Tyl |
| 12 | 3.85 | Kappa Draconis |
| 13 | 4.01 | Theta Draconis |
| 14 | 4.22 | Phi Draconis |
| 15 | 4.28 | HR 3751 |
| 16 | 4.45 | Tau Draconis |
| 17 | 4.51 | Rho Draconis |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Etamin
(compared to the Sun)
E
ccentricity: 11.7% vs. 16.0%Angle φ : 149.5°vs. 26.0°
Semi-major axis : 6,737 pc vs. 8,686 pc
Semi-minor axis: 6,691 pc vs. 8,574 pc
Focus-to-center
: 791 pcvs. 1,388 pcSemilatus rectum : 6,645 pc vs. 8,464 pc
Perigalacticon: 5,947 pc vs. 7,297 pc
Apogalacticon
: 7,528 pcvs. 10,074 pcSome Tabulated XHIP Data for Etamin
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 269.15157428° ±0.10 mas | -8.48 ±0.11 mas/yr. |
| Declination: | 51.48895101° ±0.09 mas | -22.79 ±0.10 mas/yr. |
| Galactic Longitude: | 79.05502528° | -23.73 mas/yr. |
| Galactic Latitude: | 29.21732278° | 5.30 mas/yr. |
Parallax: 21.14 ± 0.10 mas
Spectrography
Spectral Type: K5III 1989ApJS...71..245K.
Radial Velocity: -27.91 ±0.19 km/s [A rating] 2005A&A...430..165F.
Iron Abundance [Fe/H]:
-0.13 ±0.03 dex
2008A&A...480...91S, 1998A&A...338..623M, 1990ApJS...74.1075M, 1981ApJ...248..228L.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 3.76 | 0.39 |
| V | 2.24 | -1.13 |
| R | ||
| I | 0.87 | -2.50 |
| J | -0.25 | -3.62 |
| H | -1.03 | -4.41 |
| K | -1.16 | -4.54 |
B-V: +1.52 V-I: +1.37
Derivations
Heliocentric distance: 47.30 pc (0.5% margin of error)
Galactocentric distance: 7,392 pc
Transverse velocity: 5.5 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 7.8 pc | 40.5 pc | 23.1 pc |
| Velocity (U, V, W) | 0.5 km/s | -25.5 km/s | -12.6 km/s |