Theta Trianguli Australis

Theta Trianguli Australis


Credit: An artistic illustration of Theta Trianguli Australis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Triangulum Australe
Right ascension 16h 35m 44.82105s[1]
Declination −65° 29′ 43.4386″[1]
Apparent magnitude (V) +5.50[2]
Characteristics
Spectral type G8-K0 III[3]
U−B color index +0.73[2]
B−V color index +0.93[2]
Astrometry
Radial velocity (Rv)11.14±0.12[1] km/s
Proper motion (μ) RA: +45.577 mas/yr[1]
Dec.: +34.381 mas/yr[1]
Parallax (π)9.4515 ± 0.1434 mas[1]
Distance345 ± 5 ly
(106 ± 2 pc)
Absolute magnitude (MV)+0.46[4]
Details[4]
Mass2.65±0.1 M☉
Radius10.4±0.2 R☉
Luminosity64.6±1.5 L☉
Surface gravity (log g)2.81±0.056 cgs
Temperature5,071±30 K
Metallicity [Fe/H]0.01±0.026 dex
Other designations
θ TrA, CPD−65° 3331, FK5 3312, HD 148890, HIP 81252, HR 6151, SAO 253614[5]
Database references
SIMBADdata

θ Trianguli Australis, Latinized as Theta Trianguli Australis, is a single[6] star in the southern constellation of Triangulum Australe. It is visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of +5.50.[2] The star is located about 345 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +11 km/s.[1]

This is an evolved G/K-type giant star with a stellar classification of G8-K0 III.[3] This star is 2.6 times more massive than the Sun, but has expanded to ten times the radius of the Sun. It is radiating 65 times the Sun's luminosity from its photosphere at an effective temperature of 5,071 K.[4]

  1. ^ a b c d e f Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference otonni was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).