HD 162337

HD 162337
Location of HD 162337 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Apus
Right ascension 18h 05m 26.85525s[1]
Declination −81° 29′ 11.6368″[1]
Apparent magnitude (V) 6.35±0.01[2]
Characteristics
Spectral type K3/4 III[3]
U−B color index +1.75[4]
B−V color index +1.50[4]
Astrometry
Radial velocity (Rv)−3.3±0.4[5] km/s
Proper motion (μ) RA: +28.344 mas/yr[1]
Dec.: −48.347 mas/yr[1]
Parallax (π)3.2987 ± 0.0286 mas[1]
Distance989 ± 9 ly
(303 ± 3 pc)
Absolute magnitude (MV)−0.61[6]
Details
Radius42.0+4.2
−4.1[7] or 67.8±1.6[1] R☉
Luminosity495±13[7] or 1,055+28
−27[1] L☉
Surface gravity (log g)0.71±0.01[8] cgs
Temperature4,186±122[9] K
Metallicity [Fe/H]−0.66[8] dex
Rotational velocity (v sin i)<1.0[10] km/s
Other designations
65 G. Apodis[11], CD−81°673, CPD−81°799, FK5 3990, GC 24431, HD 162337, HIP 88599, HR 6646, SAO 258787[12]
Database references
SIMBADdata

HD 162337, also known as HR 6646 or rarely 65 G. Apodis, is a solitary orange-hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.35,[2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively far at a distance of 989 light-years based on Gaia DR3 parallax measurements,[1] but it is drifting closer with a heliocentric radial velocity of −3.3 km/s.[5] At its current distance, HD 162337's brightness is heavily diminished by 0.45 magnitudes due to interstellar extinction[13] and it has an absolute magnitude of −0.61.[6]

HD 162337 has a stellar classification of K3/4 III,[3] indicating that it is an evolved star with the characteristics of a K3 and K4 giant star. It has expanded to 42 times the radius of the Sun[7] and now radiates 495 times the luminosity of the Sun[7] from its enlarged photosphere at an effective temperature of 4,186 K.[9] However, Gaia DR3 stellar evolution models give a larger radius of 67.8±1.6 R☉[1] and a higher luminosity of 1,055+28
−27 L☉.[1] HD 162337 is metal deficient with an iron abundance 21.9% that of the Sun's ([Fe/H] = −0.66)[8] and it spins too slowly for its projected rotational velocity to measured accurately.[10]

  1. ^ a b c d e f g h i 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 Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Poggio2022 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gould1879 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).