Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Triangulum Australe |
Right ascension | 16h 15m 26.26978s [1] |
Declination | −63° 41′ 08.4492″ [1] |
Apparent magnitude (V) | 3.84±0.01 [2] |
Characteristics | |
Spectral type | G2 Ib-IIa [3] |
U−B color index | +0.87 [4] |
B−V color index | +1.10 [4] |
Astrometry | |
Radial velocity (Rv) | −4.9±0.7 [5] km/s |
Proper motion (μ) |
RA: +2.73
mas/
yr
[1] Dec.: −12.92 mas/ yr [1] |
Parallax (π) | 5.37 ± 0.17 mas [1] |
Distance | 610 ± 20
ly (186 ± 6 pc) |
Absolute magnitude (MV) | −2.49 [6] |
Details | |
Mass | 6.51 [7] M☉ |
Radius | 53.6 [8] R☉ |
Luminosity | 1,210 [9] L☉ |
Surface gravity (log g) | 1.54 [10] cgs |
Temperature | 4,705±122 [8] K |
Metallicity [Fe/H] | −0.05 [10] dex |
Rotational velocity (v sin i) | 8.2±2 [11] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Delta Trianguli Australis (Delta TrA), Latinized from δ Trianguli Australis, is a solitary, [14] yellow-hued star in the constellation Triangulum Australe. It has an apparent magnitude of 3.84, [2] making it readily visible to the naked eye under ideal conditions, Parallax measurements place the object at a distance of 606 light years (182 parsecs). [1] It has a heliocentirc radial velocity of −4.9 km/s, [5] indicating that it is drifting towards the Solar System.
Delta TrA has a stellar classification of G2 Ib-IIa [3] — an evolved G-type star with a luminosity class intermediate between a low luminosity supergiant and a bright giant. At present it has 6.5 times the mass of the Sun [7] and has an enlarged radius of 53.6 R☉. [8] It radiates at 1,210 times the luminosity of the Sun [9] from its photosphere at an effective temperature of 4,705 K. [8] Delta TrA has an iron abundance 89% that of the Sun, [10] placing it around solar metallicity. It spins modestly with a projected rotational velocity of 8.2 km/s, which is high for stars of this type. [11]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Triangulum Australe |
Right ascension | 16h 15m 26.26978s [1] |
Declination | −63° 41′ 08.4492″ [1] |
Apparent magnitude (V) | 3.84±0.01 [2] |
Characteristics | |
Spectral type | G2 Ib-IIa [3] |
U−B color index | +0.87 [4] |
B−V color index | +1.10 [4] |
Astrometry | |
Radial velocity (Rv) | −4.9±0.7 [5] km/s |
Proper motion (μ) |
RA: +2.73
mas/
yr
[1] Dec.: −12.92 mas/ yr [1] |
Parallax (π) | 5.37 ± 0.17 mas [1] |
Distance | 610 ± 20
ly (186 ± 6 pc) |
Absolute magnitude (MV) | −2.49 [6] |
Details | |
Mass | 6.51 [7] M☉ |
Radius | 53.6 [8] R☉ |
Luminosity | 1,210 [9] L☉ |
Surface gravity (log g) | 1.54 [10] cgs |
Temperature | 4,705±122 [8] K |
Metallicity [Fe/H] | −0.05 [10] dex |
Rotational velocity (v sin i) | 8.2±2 [11] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Delta Trianguli Australis (Delta TrA), Latinized from δ Trianguli Australis, is a solitary, [14] yellow-hued star in the constellation Triangulum Australe. It has an apparent magnitude of 3.84, [2] making it readily visible to the naked eye under ideal conditions, Parallax measurements place the object at a distance of 606 light years (182 parsecs). [1] It has a heliocentirc radial velocity of −4.9 km/s, [5] indicating that it is drifting towards the Solar System.
Delta TrA has a stellar classification of G2 Ib-IIa [3] — an evolved G-type star with a luminosity class intermediate between a low luminosity supergiant and a bright giant. At present it has 6.5 times the mass of the Sun [7] and has an enlarged radius of 53.6 R☉. [8] It radiates at 1,210 times the luminosity of the Sun [9] from its photosphere at an effective temperature of 4,705 K. [8] Delta TrA has an iron abundance 89% that of the Sun, [10] placing it around solar metallicity. It spins modestly with a projected rotational velocity of 8.2 km/s, which is high for stars of this type. [11]