Tabit, a white subgiant star in Orion
Tabit is a white subgiant star in the constellation Orion. At 26 light years away, it is the 209th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.19.
Tabit (HIP 22449)
Tabit is a white subgiant star in the constellation Orion. At 26 light years away, it is the 209th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.19. Tabit is the primary component of a multiple-star system. The star's age is estimated to be 1.4 billion years but is certainly no less than 300 million years and no greater than 2.3 billion years. The iron abundance of Tabit is 0 (100.0% of the Sun). It is moving through the Galaxy at a speed of 30.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,800 and 25,700 light years from the center of the Galaxy. It came closest to the Sun 210,000 years ago when it had brightened to magnitude 2.01 from a distance of 15.3 light years.
Sky position: RA 4h 49.8m, Dec +6° 57.6'
Common designations: Tabit , Pi-3 Orionis, 1 Orionis, HIP 22449, HD 30652, Gliese 178
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Brightest stars in Orion:
(list all)
| Rank | Mag. | Star |
| 1 | 0.18 | Rigel |
| 2 | 0.45 | Betelgeuse |
| 3 | 1.64 | Bellatrix |
| 4 | 1.69 | Alnilam |
| 5 | 1.74 | Alnitak |
| 6 | 2.07 | Saiph |
| 7 | 2.25 | Mintaka |
| 8 | 2.75 | Hatsya |
9
| 3.19
) Tabit
| Rank | Mag. | Star |
| 10 | 3.35 | Eta Orionis |
| 11 | 3.39 | Heka |
| 12 | 3.59 | Tau Orionis |
| 13 | 3.68 | Pi-4 Orionis |
| 14 | 3.71 | Pi-5 Orionis |
| 15 | 3.77 | Sigma Orionis |
| 16 | 4.06 | Omicron-2 Orionis |
| 17 | 4.09 | Phi-2 Orionis |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Tabit
(compared to the Sun)
E
ccentricity: 6.0% vs. 16.0%Angle φ : -90.3°vs. 26.0°
Semi-major axis : 7,431 pc vs. 8,686 pc
Semi-minor axis: 7,418 pc vs. 8,574 pc
Focus-to-center
: 442 pcvs. 1,388 pcSemilatus rectum : 7,405 pc vs. 8,464 pc
Perigalacticon: 6,989 pc vs. 7,297 pc
Apogalacticon
: 7,873 pcvs. 10,074 pcSome Tabulated XHIP Data for Tabit
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 72.45890914° ±0.15 mas | 462.90 ±0.50 mas/yr. |
| Declination: | 6.96124728° ±0.09 mas | 11.80 ±0.50 mas/yr. |
| Galactic Longitude: | 191.45137472° | 245.34 mas/yr. |
| Galactic Latitude: | -23.06576056° | 392.71 mas/yr. |
Parallax: 123.94 ± 0.17 mas
Spectrography
Spectral Type: F6IV-V 2001AJ....121.2148G.
Radial Velocity: 24.90 ±0.70 km/s [A rating] 2005ApJS..159..141V.
Iron Abundance [Fe/H]:
0.00 dex
2011A&A...525A..71W, 2009A&A...501..941H, 2006ApJ...652.1604B, 2006AJ....131.3069L, 2005ApJS..161..444T, 2005ApJS..159..141V, 2005AJ....129.1063L, 2004A&A...420..183A.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 3.67 | 4.14 |
| V | 3.19 | 3.66 |
| R | 2.90 | 3.37 |
| I | 2.70 | 3.17 |
| J | 1.98 | 2.45 |
| H | 1.76 | 2.22 |
| K | 1.60 | 2.07 |
B-V: +0.48 V-I: +0.49
Derivations
Heliocentric distance: 8.07 pc (0.1% margin of error)
Galactocentric distance: 7,407 pc
Transverse velocity: 17.7 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -7.3 pc | -1.5 pc | -3.2 pc |
| Velocity (U, V, W) | -26.4 km/s | -14.9 km/s | 4.1 km/s |