HD 177693

HD 177693
Location of HD 177693 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 08m 52.32474s[1]
Declination −55° 43′ 13.5297″[1]
Apparent magnitude (V) 6.45±0.01[2]
Characteristics
Spectral type K1 III[3] or K1 IV[4]
B−V color index +1.10[5]
Astrometry
Radial velocity (Rv)−20.9±2.9[6] km/s
Proper motion (μ) RA: +56.586 mas/yr[1]
Dec.: −115.876 mas/yr[1]
Parallax (π)8.6669 ± 0.0269 mas[1]
Distance376 ± 1 ly
(115.4 ± 0.4 pc)
Absolute magnitude (MV)+1.03[7]
Details
Mass1.25[8] M☉
Radius10.6[9] R☉
Luminosity50.2+0.4
−0.3[1] L☉
Surface gravity (log g)2.52[8] cgs
Temperature4,750±122[10] K
Metallicity [Fe/H]−0.10[8] dex
Rotational velocity (v sin i)<1.3[11] km/s
Other designations
48 G. Telescopii[6], CPD−55°9001, GC 26319, HD 177693, HIP 94054, HR 7233, SAO 245937, TIC 230953185[12]
Database references
SIMBADdata

HD 177693 (HR 7233; 48 G. Telescopii) is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.45,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 376 light-years,[1] and it is drifting closer with a heliocentric radial velocity of −20.9 km/s.[6] At its current distance, HD 177693's brightness is diminished by 0.24 magnitudes due to interstellar extinction[13] and it has an absolute magnitude of +1.03.[7]

HD 177693 has a stellar classification of K1 III,[3] indicating that it is an evolved orange giant. David Stanley Evans gave a less evolved class of K1 IV,[4] instead indicating that it is a slightly evolved subgiant. It has 1.25 times the mass of the Sun[8] but it has expanded to 10.6 times the radius of the Sun.[9] It radiates 50.2 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,750 K.[10] HD 177693 is slightly metal deficient with an iron abundance of [Fe/H] = −0.10[8] and it spins with a projected rotational velocity lower than 1.3 km/s.[11]

  1. ^ a b c d e f g Cite error: The named reference GaiaDR3 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 Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Evans1966 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 c Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference Anders2022 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).