Delta Trianguli Australis, a yellow supergiant star in Triangulum Australe
Delta Trianguli Australis is a yellow supergiant star in the constellation Triangulum Australe. At 606 light years away, it is the 445th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.86.
Delta Trianguli Australis (HIP 79664)
Delta Trianguli Australis is a yellow supergiant star in the constellation Triangulum Australe. At 606 light years away, it is the 445th brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 3.86. Delta Trianguli Australis is the primary component of a multiple-star system. It is moving through the Galaxy at a speed of 13.1 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,500 and 29,900 light years from the center of the Galaxy.
Sky position: RA 16h 15.4m, Dec -63° 41.4'
Common designations: Delta Trianguli Australis, HIP 79664, HD 145544, HR 6030
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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
| Rank | Mag. | Star |
| 5 | 4.11 | Epsilon Trianguli Australis |
| 6 | 4.90 | Zeta Trianguli Australis |
| 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 Delta Trianguli Australis
(compared to the Sun)
E
ccentricity: 12.1% vs. 16.0%Angle φ : 20.5°vs. 26.0°
Semi-major axis : 8,193 pc vs. 8,686 pc
Semi-minor axis: 8,133 pc vs. 8,574 pc
Focus-to-center
: 989 pcvs. 1,388 pcSemilatus rectum : 8,074 pc vs. 8,464 pc
Perigalacticon: 7,204 pc vs. 7,297 pc
Apogalacticon
: 9,182 pcvs. 10,074 pcSome Tabulated XHIP Data for Delta Trianguli Australis
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 243.85944247° ±0.11 mas | 4.00 ±0.80 mas/yr. |
| Declination: | -63.68564893° ±0.12 mas | -13.20 ±0.90 mas/yr. |
| Galactic Longitude: | 323.35974532° | -6.40 mas/yr. |
| Galactic Latitude: | -9.23290010° | -12.22 mas/yr. |
Parallax: 5.37 ± 0.17 mas
Spectrography
Spectral Type: G2Ib-IIa 1989ApJS...71..245K.
Radial Velocity: -4.90 ±0.70 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
B
4.97
-1.38
V
3.86
-2.49
R
I
2.94
-3.40
J
1.94
-4.41
H
1.44
-4.91
K
1.29
-5.06
B-V: +1.11 V-I: +0.92
Derivations
Heliocentric distance: 186.00 pc (3.2% margin of error)
Galactocentric distance: 7,253 pc
Transverse velocity: 12.2 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 147.3 pc | -109.6 pc | -29.8 pc |
| Velocity (U, V, W) | -8.6 km/s | -0.6 km/s | -9.8 km/s |