HD 173047

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]

HD 173047

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]