HD 137366
B-type star in the constellation Apus
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HD 137366 is a solitary blue-hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.38,[2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively far at a distance of approximately 1,100 light-years based on Gaia DR3 parallax measurements,[1] but its heliocentric radial velocity is not known. At its current distance, HD 137366's brightness is diminished by three-tenths of a magnitudes due to interstellar extinction[12] and it has an absolute magnitude of −1.54.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Apus |
| Right ascension | 15h 30m 49.18128s[1] |
| Declination | −71° 39′ 14.8868″[1] |
| Apparent magnitude (V) | 6.38±0.01[2] |
| Characteristics | |
| Spectral type | B3 V[3] |
| B−V color index | −0.112±0.002[4] |
| Astrometry | |
| Proper motion (μ) | RA: −6.541 mas/yr[1] Dec.: −21.027 mas/yr[1] |
| Parallax (π) | 2.976±0.0439 mas[1] |
| Distance | 1,100 ± 20 ly (336 ± 5 pc) |
| Absolute magnitude (MV) | −1.54[4] |
| Details | |
| Mass | 7.0±0.1[5] M☉ |
| Radius | 5.6[6] R☉ |
| Luminosity | 953[6] L☉ |
| Surface gravity (log g) | 3.73[7] cgs |
| Temperature | 19,290[8] K |
| Metallicity [Fe/H] | −0.17[9] dex |
| Rotational velocity (v sin i) | 8[8] km/s |
| Age | 27.7±2.5[5] Myr |
| Other designations | |
| 30 G. Apodis[10], CD−71°1162, CPD−71°1852, GC 20789, HD 137366, HIP 75959, SAO 257284[11] | |
| Database references | |
| SIMBAD | data |
HD 137366 has a stellar classification of B3 V,[3] indicating that it is an ordinary B-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 7 times the mass of the Sun[5] and 5.6 times the radius of the Sun.[6] It radiates 953 times the luminosity of the Sun[6] from its photosphere at an effective temperature of 19,290 K.[8] HD 137366 is metal deficient with an iron abundance 67.6% that of the Sun's ([Fe/H] = −0.17)[9] and it is estimated to be 27.7 million years old.[5] Unlike most hot stars, HD 137366 has a relatively low projected rotational velocity of only 8 km/s.[8]