Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Telescopium [1] |
Right ascension | 18h 49m 27.3433s [2] |
Declination | –45° 48′ 36.3601″ [2] |
Apparent magnitude (V) | 5.80 ± 0.01 [3] |
Characteristics | |
Evolutionary stage | Horizontal branch [4] |
Spectral type | G8 III [5] |
B−V color index | +0.9 [6] |
Astrometry | |
Radial velocity (Rv) | 9.7 ± 2.9 [7] km/s |
Proper motion (μ) | RA: +74.263 [2] mas/yr Dec.: +57.015 [2] mas/yr |
Parallax (π) | 8.9671±0.0429 mas [2] |
Distance | 364 ± 2 ly (111.5 ± 0.5 pc) |
Absolute magnitude (MV) | +0.6 [1] |
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 [4] 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, [3] 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 , [2] and it is currently receding from the Solar System with a heliocentric radial velocity of 9.7 km/s . [7]
This is a red giant with a stellar classification of G8 III. [5] It is currently on the cool end of the horizontal branch, fusing helium at its core. [4] 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; [4] it spins modestly with a projected rotational velocity of 2.7 km/s . [4]