HD 164595

HD 164595

Position of star HD 164595 in the constellation Hercules
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules[1]
Right ascension 18h 00m 38.894s[2]
Declination +29° 34′ 18.92″[2]
Apparent magnitude (V) 7.07[1] + 12.538[3]
Characteristics
Spectral type G2 V[4] + M2.5 V[5]
B−V color index 0.635±0.005[1]
Astrometry
Radial velocity (Rv)2.048±0.0007[6] km/s
Proper motion (μ) RA: −138.982 mas/yr[2]
Dec.: 173.502 mas/yr[2]
Parallax (π)35.402 ± 0.0146 mas[2]
Distance92.13 ± 0.04 ly
(28.25 ± 0.01 pc)
Absolute magnitude (MV)+4.81[1]
Details
HD 164595 A (primary)
Mass1.081±0.054[7] M☉
Radius1.057±0.053[7] R☉
Luminosity1.023+0.049
−0.046[8] L☉
Surface gravity (log g)4.44±0.05[9] cgs
Temperature5,790±40[9] K
Metallicity [Fe/H]−0.06[9] dex
Rotational velocity (v sin i)0.1[8] km/s
Age4.5[9] Gyr
HD 164595 B (secondary)
Mass0.455±0.046[3] M☉
Radius0.464±0.018[3] R☉
Temperature3,648±21[3] K
Rotation43.486848 d[10]
Other designations
BD+29 3165, HD 164595, HIP 88194, SAO 85632, PPM 106642, WDS J18006+2934, TYC 2103-1620-1, 2MASS J18003890+2934188[11]
Database references
SIMBADdata

HD 164595 is a wide binary star[12] system in the northern constellation of Hercules.[1] The primary component of this pair hosts an orbiting exoplanet. The system is located at a distance of 92 light years from the Sun based on parallax measurements,[2] and is drifting further away with a radial velocity of 2.0 km/s.[6] Although it has an absolute magnitude of +4.81,[1] at that distance it is too faint to be viewed with the naked eye, having an apparent visual magnitude of 7.07.[1] The brighter star can be found with binoculars or a small telescope less than a degree to the east-northeast of Xi Herculis.[13] HD 164595 has a relatively large proper motion, traversing the celestial sphere at an angular rate of 0.222″ yr−1.[14]

The spectrum of the primary, component A, presents as a G-type main-sequence star with a stellar classification of G2 V.[4] It is considered an excellent solar twin candidate,[15][16] although it has a lower logarithm of metallicity ratio, at −0.06 compared with 0.00, and a slightly younger age, at 4.5 versus 4.6 billion years.[9][17][a] The estimated mass, radius, and luminosity of this star are all similar to the Sun, and the level of magnetic activity in the chromosphere is comparable to solar levels.[15]

The secondary member, component B, is a magnitude 12.5[3] star at a projected separation of 2,509±27 AU from the primary.[12] It is a small red dwarf of spectral class M2.5 V.[5] Periodic variations in the light curve of this star suggest a rotation period of 43.5 days.[10]

  1. ^ a b c d e f g Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Mann_et_al_2015 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference mk was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Alonso-Floriano_et_al_2015 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Kervella_et_al_2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Brewer_et_al_2016 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference aaa563_A52 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Hartman_et_al_2011 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Montes_et_al_2018 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Sinnott_Perryman_1997 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Lepine_Shara_2005 was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference Porto_de_Mello_et_al_2014 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Mahdi2016 was invoked but never defined (see the help page).
  17. ^ a b Cite error: The named reference nssdc was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference NASA_2013 was invoked but never defined (see the help page).


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