Delta Trianguli Australis
Template:Location mark Location of δ TrA (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Triangulum Australe |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 3.84±0.01[2] |
| Characteristics | |
| Spectral type | G2 Ib-IIa[3] |
| U−B Template:Engvar | +0.87[4] |
| B−V Template:Engvar | +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 | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −2.49[6] |
| Details | |
| Mass | 6.51[7] Template:Solar mass |
| Radius | 53.6[8] Template:Solar radius |
| Luminosity | 1,210[9] Template:Solar luminosity |
| 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 |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[12] | |
| Database references | |
| SIMBAD | data |
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Delta Trianguli Australis (Delta TrA), Latinized from δ Trianguli Australis, is a solitary,[13] 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 heliocentric radial velocity of Script error: No such module "val".,[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 Template:Solar radius.[8] It radiates at 1,210 times the luminosity of the Sun[9] from its photosphere at an effective temperature of Script error: No such module "val"..[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 Script error: No such module "val"., which is high for stars of this type.[11]
References
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