Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Apus |
Right ascension | 15h 00m 11.3018s[1] |
Declination | −77° 09′ 37.9863″[1] |
Apparent magnitude (V) | 5.92±0.01[2] |
Characteristics | |
Spectral type | G8 II[3] |
U−B color index | +0.81[4] |
B−V color index | +1.05[4] |
Astrometry | |
Radial velocity (Rv) | 1.9±0.4[5] km/s |
Proper motion (μ) | RA: −13.997[1] mas/yr Dec.: −10.915[1] mas/yr |
Parallax (π) | 3.5348 ± 0.0272 mas[1] |
Distance | 923 ± 7 ly (283 ± 2 pc) |
Absolute magnitude (MV) | −0.91[6] |
Details | |
Mass | 3.13±0.58[7] M☉ |
Radius | 22.69[8] R☉ |
Luminosity | 295[6] L☉ |
Temperature | 4,750[7] K |
Metallicity [Fe/H] | −0.3[9] dex |
Rotational velocity (v sin i) | 9.1±2[10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 131425 (HR 5547) is a solitary star in the southern circumpolar constellation Apus. It has an apparent magnitude of 5.92,[2] allowing it to be seen with the naked eye under ideal conditions. Located 923 light years away,[1] it is receding with a heliocentric radial velocity of 1.9 km/s.[5]
HD 131425 has a stellar classification of G8 II, indicating that it is an ageing G-type bright giant.[3] At present it has 3.13 times the mass of the Sun[7] and an enlarged diameter of 22.69 R☉.[8] It shines at 295 times the luminosity of the Sun[6] from its photosphere at an effective temperature of 4,750 K,[7] giving it an orange yellow glow. HD 131425 has an iron abundance only half of the Sun[9] and spins with a projected rotational velocity of 9.1 km/s,[10] unusually high for giants.