HD 164509

HD 164509
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus[1]
Right ascension 18h 01m 31.228s[2]
Declination 00° 06′ 16.40″[2]
Apparent magnitude (V) 8.10[1]
Characteristics
Evolutionary stage main sequence
Spectral type G2V[3] + M6.5V[4]
B−V color index 0.665±0.018[2]
J−H color index 0.28[2]
J−K color index 0.36[2]
Astrometry
Radial velocity (Rv)13.68±0.16[5] km/s
Proper motion (μ) RA: −7.876 mas/yr[2]
Dec.: −20.462 mas/yr[2]
Parallax (π)18.6155 ± 0.0219 mas[2]
Distance175.2 ± 0.2 ly
(53.72 ± 0.06 pc)
Absolute magnitude (MV)4.64[6]
Orbit[7]
PrimaryHD 164509 A
CompanionHD 164509 B
Period (P)∼180 yr
Semi-major axis (a)36.5 ±1.9 au
Eccentricity (e)0.87 ±0.21
Details
HD 164509 A
Mass1.103±0.004[8] M☉
Radius1.041±0.003[8] R☉
Luminosity1.150±0.001[8] L☉
Surface gravity (log g)4.44±0.01[8] cgs
Temperature5,865±7[8] K
Metallicity [Fe/H]0.21[9] dex
Rotational velocity (v sin i)2.4±0.5[6] km/s
Age1.5±0.2[8] Gyr
HD 164509 B
Mass0.45±0.01[4] M☉
Temperature2,710[4] K
Other designations
BD+00 3837, Gaia DR2 4275421969292868224, HD 164509, HIP 88268, 2MASS J18013121+0006163, DENIS J084619.3-080136[10]
Database references
SIMBAD164509 data

HD 164509 is a binary star system in the constellation of Ophiuchus.[1] The primary component has an orbiting exoplanet companion.[6] This system is located at a distance of 175 light years based on parallax measurements,[2] and is drifting further away with a radial velocity of 13.7 km/s.[5] It has an absolute magnitude of 4.64,[6] but at that distance the system has an apparent visual magnitude of 8.10,[1] which is too faint to be seen with the naked eye.

The primary component is a Sun-like G-type main-sequence star[6] with a stellar classification of G2V.[3] It is young and metal rich, having heavy elements abundance 160% of solar.[9] The star has a modest level of magnetic activity in its chromosphere.[6] It has 1.10 times the mass of the Sun and 1.04 times the Sun's radius.[8] This star is radiating 1.15[8] times the luminosity of the Sun from its photosphere at an effective temperature of 5,865 K.[8]

Initially it was thought the system consisted of a single star, but in 2016 it was discovered the primary is accompanied by the M-class red dwarf star at a projected separation of 36.5±1.9 AU.[7] The evidence for this stellar companion being on a bound orbit was further fortified in 2017.[11][4]

  1. ^ a b c d Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk_Swift_1999 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Gonzales_et_al_2020 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference Giguere2011 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Wittrock_et_al_2016 was invoked but never defined (see the help page).
  8. ^ a b c d e f g h i Cite error: The named reference Bonfanti_et_al_2015 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Bryan_et_al_2016 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Ngo_et_al_2017 was invoked but never defined (see the help page).