Theemim, a yellow giant star in Eridanus
Theemim is a yellow giant star in the constellation Eridanus. At 214 light years away, it is the 411st brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.81.
Theemim (HIP 21393)
Theemim is a yellow giant star in the constellation Eridanus. At 214 light years away, it is the 411st brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.81. The iron abundance of Theemim is 0 (100.0% of the Sun). It is moving through the Galaxy at a speed of 16.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,600 and 42,000 light years from the center of the Galaxy.
Sky position: RA 4h 35.6m, Dec -30° 33.6'
Common designations: Theemim, Upsilon-2 Eridani, 52 Eridani, HIP 21393, HD 29291
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Brightest stars in Eridanus:
(list all)
| Rank | Mag. | Star |
| 2 | 2.78 | Cursa |
| 3 | 2.88 | Acamar |
| 4 | 2.97 | Zaurak |
| 5 | 3.52 | Rana |
| 6 | 3.55 | Upsilon-4 Eridani |
| 7 | 3.56 | Phi Eridani |
| 8 | 3.69 | chi Eridani |
| 9 | 3.70 | Tau-4 Eridani |
| 10 | 3.72 | Epsilon Eridani |
11
| 3.81
) Theemim
| Rank | Mag. | Star |
| 12 | 3.86 | Sceptrum |
| 13 | 3.89 | Azha |
| 14 | 3.93 | Nu Eridani |
| 15 | 3.97 | 43 Eridani |
| 16 | 4.01 | Mu Eridani |
| 17 | 4.04 | Beid |
| 18 | 4.08 | Tau-3 Eridani |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Theemim
(compared to the Sun)
E
ccentricity: 28.0% vs. 16.0%Angle φ : 27.4°vs. 26.0°
Semi-major axis : 10,065 pc vs. 8,686 pc
Semi-minor axis: 9,663 pc vs. 8,574 pc
Focus-to-center
: 2,815 pcvs. 1,388 pcSemilatus rectum : 9,277 pc vs. 8,464 pc
Perigalacticon: 7,249 pc vs. 7,297 pc
Apogalacticon
: 12,880 pcvs. 10,074 pcSome Tabulated XHIP Data for Theemim
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 68.88779881° ±0.12 mas | -49.23 ±0.14 mas/yr. |
| Declination: | -30.56231068° ±0.14 mas | -12.63 ±0.16 mas/yr. |
| Galactic Longitude: | 231.01256974° | 3.25 mas/yr. |
| Galactic Latitude: | -41.30587454° | -50.72 mas/yr. |
Parallax: 15.25 ± 0.19 mas
Spectrography
Spectral Type: G8+ III 1989ApJS...71..245K.
Radial Velocity: -4.00 ±0.70 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
0.00 ±0.06 dex
1990ApJS...74.1075M.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 4.77 | 0.68 |
| V | 3.81 | -0.27 |
| R | ||
| I | 2.99 | -1.10 |
| J | 2.15 | -1.93 |
| H | 1.66 | -2.42 |
| K | 1.55 | -2.53 |
B-V: +0.96 V-I: +0.82
Derivations
Heliocentric distance: 65.56 pc (1.2% margin of error)
Galactocentric distance: 7,431 pc
Transverse velocity: 15.8 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -31.0 pc | -38.3 pc | -43.3 pc |
| Velocity (U, V, W) | 9.2 km/s | 9.8 km/s | -9.2 km/s |