HD 164604

HD 164604 / Pincoya
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 18h 03m 06.93314s[1]
Declination –28° 33′ 38.3576″[1]
Apparent magnitude (V) 9.62[2]
Characteristics
Spectral type K3.5V(k)[3]
Apparent magnitude (B) 11.016[2]
Apparent magnitude (J) 7.784±0.024[2]
Apparent magnitude (H) 7.306±0.038[2]
Apparent magnitude (K) 7.169±0.020[2]
B−V color index 1.396±0.491[2]
Astrometry
Radial velocity (Rv)7.30±0.16[4] km/s
Proper motion (μ) RA: −34.658±0.036[4] mas/yr
Dec.: −42.253±0.025[4] mas/yr
Parallax (π)24.9867 ± 0.0351 mas[4]
Distance130.5 ± 0.2 ly
(40.02 ± 0.06 pc)
Absolute magnitude (MV)6.57[2]
Details
Mass0.77±0.04[5] M☉
Radius0.77+0.01
−0.04[1] R☉
Luminosity0.258±0.001[1] L☉
Surface gravity (log g)4.41[3] cgs
Temperature4,684+135
−37[5] K
Metallicity [Fe/H]0.09±0.08[2] dex
Age7.24±4.72[6] Gyr
Other designations
CD–28° 14058, HD 164604, HIP 88414, SAO 186165, PPM 267742[7]
Database references
SIMBADdata
Exoplanet Archivedata

HD 164604 is a single star in the southern constellation of Sagittarius constellation. It has the proper name Pincoya, as selected in the NameExoWorlds campaign by Chile, during the 100th anniversary of the IAU. Pincoya is a female water spirit from southern Chilean mythology who is said to bring drowned sailors to the Caleuche so that they can live in the afterlife.[8][9] A 2015 survey ruled out the existence of any additional stellar companions at projected distances from 13 to 340 astronomical units.[10] It is known to host a single super-Jupiter exoplanet.[11]

This star is invisible to the naked eye with an apparent visual magnitude of 9.62.[2] It is located at a distance of 128.5 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +6 km/s.[12] The stellar classification of HD 164604 is K3.5V(k), which indicates this is a K-type main-sequence star. The chromosphere is considered very inactive.[3] It is roughly seven[6] billion years old with 77% of the mass[5] and radius[1] of the Sun. The star is radiating 26%[1] of the luminosity of the Sun from its photosphere at an effective temperature of 4,684 K.[5]

  1. ^ a b c d e f g Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Gray_et_al_2006 was invoked but never defined (see the help page).
  4. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  5. ^ a b c d Cite error: The named reference Feng_et_al_2019 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Pace2013 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference NameExoWorlds was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference IAU1912 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Mugrauer_Ginski_2015 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Arriagada2010 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gontcharov was invoked but never defined (see the help page).