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