HD 164712

HD 164712
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Apus
Right ascension 18h 11m 15.80732s[1]
Declination −75° 53′ 29.4836″[1]
Apparent magnitude (V) 5.86[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K2 III[4]
U−B color index +1.43[5]
B−V color index +1.24[5]
Astrometry
Radial velocity (Rv)14.8±3.2[6] km/s
Proper motion (μ) RA: +16.16 mas/yr[1]
Dec.: -296.819 mas/yr[1]
Parallax (π)14.2681 ± 0.0440 mas[1]
Distance228.6 ± 0.7 ly
(70.1 ± 0.2 pc)
Absolute magnitude (MV)+1.48[2]
Details
Mass1.15[7] M☉
Radius9.09[8] R☉
Luminosity33.1+1.6
−1.5[9] L☉
Surface gravity (log g)2.55[7] cgs
Temperature4,360±90[9] K
Metallicity [Fe/H]+0.24[10] dex
Rotational velocity (v sin i)<1.5[11] km/s
Age4.54+0.46
−0.56[3] Gyr
Other designations
66 G. Apodis[12], CD−75°1016, CPD−75°1410, FK5 678, GC 24680, HD 164712, HIP 89115, HR 6731, SAO 257569, WDS J18113-7553A[13]
Database references
SIMBADdata

HD 164712, also known as HR 6731 is an orange hued star located in the southern constellation of Apus. It has an apparent magnitude of 5.86,[2] making it faintly visible to the naked eye if viewed under ideal conditions. Parallax measurements place the object at a distance of 229 light-years (70 pc),[1] and it is currently receding with a heliocentric radial velocity of 14.8 km/s.[6]

HD 164712 has a stellar classification of K2 III, indicating that it is a red giant. David Stanley Evans gave it a slightly cooler class of K3 III.[14] Gaia Data Release 3 models place it on the bump of red giant branch, a period of temporary contraction.[3] At present it has 1.15 times the mass of the Sun[7] but at an age of 4.54 billion years,[3] it has expanded to 9.09 times its girth.[8] It shines with a luminosity of 33.1 L☉ from its enlarged photosphere at an effective temperature of 4,360 K.[9] HD 164712 is a thick disk star with an iron abundance 73% above solar level.[10] This makes it metal enriched. Like most giants, it spins slowly, with its projected rotational velocity being lower than 1.5 km/s.[11]

HR 6731 has two faint companions. Component B is a 13th magnitude object separated 24.6″ away along a position angle of 299°.[15] Component C is a 14th magnitude star 18.1″ away along a position angle of 109°.[15] The first one is a background object while the other one appears to be physically related.[15] As for HD 164712, it shows indications of an infrared excess, suggesting there may be a dusty disk in orbit around the star.[16][17]

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b 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. ^ a b c Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Charbonnel2020 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Eggen1993 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 Gould1879 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 Evans1966 was invoked but never defined (see the help page).
  15. ^ a b c Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Zuckerman1995 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference plets1997 was invoked but never defined (see the help page).