| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h49m 27.3433s[1] |
| Declination | –45° 48′ 36.3601″[1] |
| Apparent magnitude (V) | 5.80 ± 0.01[2] |
| Characteristics | |
| Evolutionary stage | Horizontal branch[3] |
| Spectral type | G8 III[4] |
| B−V color index | +0.9[5] |
| Astrometry | |
| Radial velocity (Rv) | 9.7 ± 2.9[6] km/s |
| Proper motion (μ) | RA: +74.263[1] mas/yr Dec.: +57.015[1] mas/yr |
| Parallax (π) | 8.9671 ± 0.0429 mas[1] |
| Distance | 364 ± 2 ly (111.5 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.6[7] |
| Details | |
| Mass | 1.31[8] M☉ |
| Radius | 10.3[9] R☉ |
| Luminosity | 63.6±0.9[10] L☉ |
| Surface gravity (log g) | 2.46[8] cgs |
| Temperature | 5,093±123[9] K |
| Metallicity [Fe/H] | −0.43 ± 0.16[3] dex |
| Rotational velocity (v sin i) | 2.7±1.5[11] km/s |
| Other designations | |
30 G. Telescopii[12], CPD−45 9479, FK5 3495, HD 173791, HIP 92367, SAO 229306[13] | |
| Database references | |
| SIMBAD | data |
HD 173791 (HR 7065) is a solitary[14] yellow hued star located in the southern constellation Telescopium. It has an apparent magnitude of 5.80,[2] allowing it to be viewed with the naked eye under suitable viewing conditions. Parallax measurements place the object at a distance of 364 light years ,[1] and it is currently receding from the Solar System with a heliocentric radial velocityof9.7 km/s.[6]
This is a red giant with a stellar classification of G8 III.[4] It is currently on the cool end of the horizontal branch, fusing helium at its core.[3] At present it has 1.31 times the mass of the Sun[8] but has expanded to 10.3 times its girth.[9] It radiates at 63.6 L☉[10] from its enlarged photosphere at an effective temperature of 5,093 K.[9] HD 173791 is metal deficient–with a metallicity only 37% that of the Sun;[3] it spins modestly with a projected rotational velocityof2.7 km/s.[3]
