S Trianguli Australis
Variable star in the constellation Triangulum Australe / From Wikipedia, the free encyclopedia
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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
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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] |
Distance | 3,030 ± 80 ly (930 ± 30 pc) |
Absolute magnitude (MV) | −3.53[9] |
Details | |
Mass | 2.8[10] M☉ |
Radius | 39.2[10] R☉ |
Surface gravity (log g) | 2.1±0.1[3] cgs |
Temperature | 5,976±67[3] K |
Metallicity [Fe/H] | 0.12±0.05[3] dex |
Other designations | |
Database references | |
SIMBAD | data |
Close
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]