HD 173047
B-type bright giant in the constellation Telescopium
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HD 173047 is a solitary, bluish-white hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.24,[2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively far at a distance of 1,050 light-years based on Gaia DR3 parallax measurements, but it is drifting closer with a heliocentric radial velocity of −10.7 km/s.[1] At its current distance, HHD 173047's brightness is heavily diminished by 0.44 magnitudes due to interstellar extinction[8] and it has an absolute magnitude of −1.52[4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 45m 55.99514s[1] |
| Declination | −50° 52′ 21.7342″[1] |
| Apparent magnitude (V) | 6.24±0.01[2] |
| Characteristics | |
| Spectral type | B8/9 II[3] |
| B−V color index | −0.080±0.006[4] |
| Astrometry | |
| Radial velocity (Rv) | −10.7±0.4[1] km/s |
| Proper motion (μ) | RA: +3.697 mas/yr[1] Dec.: −15.975 mas/yr[1] |
| Parallax (π) | 3.1031±0.0499 mas[1] |
| Distance | 1,050 ± 20 ly (322 ± 5 pc) |
| Absolute magnitude (MV) | −1.52[4] |
| Details | |
| Mass | 4.00±0.11[5] M☉ |
| Radius | 5.54+0.15 −0.14[1] R☉ |
| Luminosity (bolometric) | 692[5] L☉ |
| Surface gravity (log g) | 3.43[6] cgs |
| Temperature | 11,843±156[7] K |
| Metallicity [Fe/H] | +0.10[6] dex |
| Age | 194[8] Myr |
| Other designations | |
| 28 G. Telescopii[9], CD−50°12122, CPD−50°10815, GC 25645, HD 173047, HIP 92072, SAO 245693[10] | |
| Database references | |
| SIMBAD | data |
HD 173047 has a stellar classification of B8/9 II,[3] indicating that it is an evolved B-type star with the characteristics of a B8 and B9 bright giant. It has 4 times the mass of the Sun[5] and a slightly enlarged radius that is 5.54 times that of the Sun.[1] It radiates a bolometric luminosity 692 times that of the Sun[5] from its photosphere at an effective temperature of 11,843 K.[7] HD 173047 is metal enriched with an iron abundance of 126% that of the Sun ([Fe/H] = +0.10)[6] and it is estimated to be 194 million years old.[8]