S Trianguli Australis

S Trianguli Australis

A light curve for S Trianguli Australis, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Triangulum Australe
Right ascension 16h 01m 10.71590s[2]
Declination −63° 46′ 35.5324″[2]
Apparent magnitude (V) 6.41[3] (5.95 – 6.81)[4]
Characteristics
Spectral type F8 II[5]
B−V color index 0.567±0.020[6]
Variable type δ Cep[7]
Astrometry
Radial velocity (Rv)2.2±1.3[8] km/s
Proper motion (μ) RA: −2.244[2] mas/yr
Dec.: −2.804[2] mas/yr
Parallax (π)1.0753 ± 0.0301 mas[2]
Distance3,030 ± 80 ly
(930 ± 30 pc)
Absolute magnitude (MV)−3.53[9]
Details
Mass2.8[10] M☉
Radius39.2[10] R☉
Surface gravity (log g)2.1±0.1[3] cgs
Temperature5,976±67[3] K
Metallicity [Fe/H]0.12±0.05[3] dex
Other designations
S TrA, CD−63° 1146, HD 142941, HIP 78476, HR 5939, SAO 253377[11]
Database references
SIMBADdata

S Trianguli Australis is a yellow-white hued variable star in the constellation Triangulum Australe. It is a dim star near the lower limit of visibility with the naked eye, having a typical apparent visual magnitude of 6.41.[3] Based upon an annual parallax shift of 1.08 mas,[2] it is located 3,030 light years from the Earth.

A Classical Cepheid variable, its apparent magnitude ranges from 5.95 to 6.81 over 6.32344 days.[4] It is a bright giant with a nominal stellar classification of F8 II,[5] that pulsates between spectral types F6II-G2.[4] The star has 2.8 times the mass of the Sun and 39.2 times the Sun's radius.[10] It is losing mass at the estimated rate of 2.8×10−10 M☉·yr−1.[9]

  1. ^ Cite error: The named reference HIPCurve was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Soubiran2016 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference AAVSOS was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference houk1979 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. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Neilson2008 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference usenko2014 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).