HD 173791

HD 173791
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 49m 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]
Distance364 ± 2 ly
(111.5 ± 0.5 pc)
Absolute magnitude (MV)+0.6[7]
Details
Mass1.31[8] M☉
Radius10.3[9] R☉
Luminosity63.6±0.9[10] L☉
Surface gravity (log g)2.46[8] cgs
Temperature5,093±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
SIMBADdata

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 velocity of 9.7 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 velocity of 2.7 km/s.[3]

  1. ^ a b c d e f Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Jones2011 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference DeMed2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference gould was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Eggelton2008 was invoked but never defined (see the help page).