Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Triangulum Australe |
Right ascension | 15h 19m 45.71231s [2] |
Declination | −66° 29′ 45.7417″ [2] |
Apparent magnitude (V) | 6.73 [3] (6.33 - 6.90) [4] |
Characteristics | |
Spectral type | F7 Ib/II [5] |
Variable type | δ Cep [6] |
Astrometry | |
Radial velocity (Rv) | −13.2±1.6 [7] km/s |
Proper motion (μ) |
RA: −5.113
[2]
mas/
yr Dec.: −8.317 [2] mas/ yr |
Parallax (π) | 1.4754 ± 0.0371 mas [2] |
Distance | 2,210 ± 60
ly (680 ± 20 pc) |
Absolute magnitude (MV) | 2.69 [8] |
Details | |
Mass | 5.42 or 5.66 [9] M☉ |
Radius | 24.7±1.9 [10] or 35.8±0.8 [9] R☉ |
Surface gravity (log g) | 2.10 [9] cgs |
Temperature | 5,852±21 [9] K |
Metallicity [Fe/H] | +0.06±0.08 [8] dex |
Rotational velocity (v sin i) | 16 km/s |
Other designations | |
Database references | |
SIMBAD | data |
R Trianguli Australis is a yellow-white hued variable star in the southern constellation Triangulum Australe. It is near the limit of visibility to the naked eye, having a typical apparent visual magnitude of 6.73. [3] Based upon an annual parallax shift of 1.48 mas, [2] it is located 2,210 light years away. R TrA is moving closer with a heliocentric radial velocity of −13 km/s. [7]
This is a Classical Cepheid variable with an apparent magnitude that ranges from 6.33 to 6.90 over 3.38926 days. [4] It is a bright giant/ supergiant with a nominal stellar classification of F7 Ib/II, [5] but pulsates between spectral types F5Ib/II-G5. [4] Depending on the method employed, the estimated mass is 5.42 or 5.66 times the mass of the Sun and it has 24.7 or 35.8 times the Sun's radius. [9] R TrA has an infrared excess that is being emitted by circumstellar silicate dust heated to 150–200 K. It is losing mass at the rate of 4×10−9 M☉·y−1. [9]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Triangulum Australe |
Right ascension | 15h 19m 45.71231s [2] |
Declination | −66° 29′ 45.7417″ [2] |
Apparent magnitude (V) | 6.73 [3] (6.33 - 6.90) [4] |
Characteristics | |
Spectral type | F7 Ib/II [5] |
Variable type | δ Cep [6] |
Astrometry | |
Radial velocity (Rv) | −13.2±1.6 [7] km/s |
Proper motion (μ) |
RA: −5.113
[2]
mas/
yr Dec.: −8.317 [2] mas/ yr |
Parallax (π) | 1.4754 ± 0.0371 mas [2] |
Distance | 2,210 ± 60
ly (680 ± 20 pc) |
Absolute magnitude (MV) | 2.69 [8] |
Details | |
Mass | 5.42 or 5.66 [9] M☉ |
Radius | 24.7±1.9 [10] or 35.8±0.8 [9] R☉ |
Surface gravity (log g) | 2.10 [9] cgs |
Temperature | 5,852±21 [9] K |
Metallicity [Fe/H] | +0.06±0.08 [8] dex |
Rotational velocity (v sin i) | 16 km/s |
Other designations | |
Database references | |
SIMBAD | data |
R Trianguli Australis is a yellow-white hued variable star in the southern constellation Triangulum Australe. It is near the limit of visibility to the naked eye, having a typical apparent visual magnitude of 6.73. [3] Based upon an annual parallax shift of 1.48 mas, [2] it is located 2,210 light years away. R TrA is moving closer with a heliocentric radial velocity of −13 km/s. [7]
This is a Classical Cepheid variable with an apparent magnitude that ranges from 6.33 to 6.90 over 3.38926 days. [4] It is a bright giant/ supergiant with a nominal stellar classification of F7 Ib/II, [5] but pulsates between spectral types F5Ib/II-G5. [4] Depending on the method employed, the estimated mass is 5.42 or 5.66 times the mass of the Sun and it has 24.7 or 35.8 times the Sun's radius. [9] R TrA has an infrared excess that is being emitted by circumstellar silicate dust heated to 150–200 K. It is losing mass at the rate of 4×10−9 M☉·y−1. [9]