Delta Trianguli Australis

δ Trianguli Australis
Location of δ TrA (circled)
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]
Distance610 ± 20 ly
(186 ± 6 pc)
Absolute magnitude (MV)−2.49[6]
Details
Mass6.51[7] M☉
Radius53.6[8] R☉
Luminosity1,210[9] L☉
Surface gravity (log g)1.54[10] cgs
Temperature4,705±122[8] K
Metallicity [Fe/H]−0.05[10] dex
Rotational velocity (v sin i)8.2±2[11] km/s
Other designations
δ TrA, 25 G. Trianguli Australis[12], CPD−63°3854, FK5 602, GC 21819, HD 145544, HIP 79664, HR 6030, SAO 253474, WDS J16154-6341A[13]
Database references
SIMBADdata

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 heliocentric 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]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cousins1971 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Luck2014 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).