Zeta Trianguli Australis, a white main-sequence star in Triangulum Australe
Zeta Trianguli Australis is a white main-sequence star in the constellation Triangulum Australe. At 40 light years away, it shines at an apparent visual magnitude of 4.9.
Zeta Trianguli Australis (HIP 80686)
Zeta Trianguli Australis is a white main-sequence star in the constellation Triangulum Australe. At 40 light years away, it shines at an apparent visual magnitude of 4.90. The star's age is estimated to be 300 million years but is certainly no greater than 2.7 billion years. The iron abundance of Zeta Trianguli Australis is -0.1 (79.4% of the Sun). It is moving through the Galaxy at a speed of 15.5 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,200 and 37,600 light years from the center of the Galaxy.
Sky position: RA 16h 28.5m, Dec -70° 4.8'
Common designations: Zeta Trianguli Australis, HIP 80686, HD 147584, HR 6098, Gliese 624
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Brightest stars in Triangulum Australe:
(list all)
| Rank | Mag. | Star |
| 1 | 1.91 | Atria |
| 2 | 2.83 | Beta Trianguli Australis |
| 3 | 2.87 | Gamma Trianguli Australis |
| 4 | 3.86 | Delta Trianguli Australis |
| 5 | 4.11 | Epsilon Trianguli Australis |
6
| 4.90
) Zeta Trianguli Australis
| Rank | Mag. | Star |
| 7 | 5.10 | HR 6204 |
| 8 | 5.11 | Kappa Trianguli Australis |
| 9 | 5.19 | HR 6125 |
| 10 | 5.28 | Iota Trianguli Australis |
| 11 | 5.50 | Theta Trianguli Australis |
| 12 | 5.54 | HD 140483 |
| 13 | 5.71 | HR 5725 |
| 14 | 5.74 | HR 5920 |
| 15 | 5.75 | HR 5644 |
| 16 | 5.76 | HR 5621 |
| 17 | 5.76 | HR 5905 |
Galactic Orbit of Zeta Trianguli Australis
(compared to the Sun)
E
ccentricity: 23.8% vs. 16.0%Angle φ : 36.5°vs. 26.0°
Semi-major axis : 9,330 pc vs. 8,686 pc
Semi-minor axis: 9,063 pc vs. 8,574 pc
Focus-to-center
: 2,218 pcvs. 1,388 pcSemilatus rectum : 8,803 pc vs. 8,464 pc
Perigalacticon: 7,112 pc vs. 7,297 pc
Apogalacticon
: 11,548 pcvs. 10,074 pcSome Tabulated XHIP Data for Zeta Trianguli Australis
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 247.11583825° ±0.23 mas | 197.80 ±0.70 mas/yr. |
| Declination: | -70.08467025° ±0.37 mas | 111.50 ±0.70 mas/yr. |
| Galactic Longitude: | 319.53024797° | 214.86 mas/yr. |
| Galactic Latitude: | -14.57352320° | -73.42 mas/yr. |
Parallax: 82.53 ± 0.52 mas
Spectrography
Spectral Type: F9V 2006AJ....132..161G.
Radial Velocity:
8.30 ±0.30 km/s [D rating]
2006AstL...32..759G.
This star is a spectroscopic binary with an unsolved orbit.
Iron Abundance [Fe/H]:
-0.10 ±0.02 dex
2011A&A...530A.138C, 2007A&A...465..271R, 2005ApJS..161..444T, 2004A&A...420..183A, 2003A&A...410..527B, 1988A&A...206..100A.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 5.46 | 5.04 |
| V | 4.90 | 4.48 |
| R | ||
| I | 4.33 | 3.91 |
| J | 4.11 | 3.69 |
| H | 3.65 | 3.23 |
| K | 3.66 | 3.24 |
B-V: +0.56 V-I: +0.57
Derivations
Heliocentric distance: 12.12 pc (0.6% margin of error)
Galactocentric distance: 7,391 pc
Transverse velocity: 13.0 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 8.9 pc | -7.6 pc | -3.0 pc |
| Velocity (U, V, W) | 13.3 km/s | 4.9 km/s | -6.2 km/s |