HD 131425
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| 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 | |
| 19 G. Apodis, CPD−76°931, GC 20104, HD 131425, HIP 73415, HR 5547, SAO 257218 | |
| 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.
