18h03m06.95s, −28° 33′ 38.3″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h03m 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] |
| Distance | 130.5 ± 0.2 ly (40.02 ± 0.06 pc) |
| Absolute magnitude (MV) | 6.57[2] |
| Details | |
| Mass | 0.77±0.04[5] M☉ |
| Radius | 0.77+0.01 −0.04[1] R☉ |
| Luminosity | 0.258±0.001[1] L☉ |
| Surface gravity (log g) | 4.41[3] cgs |
| Temperature | 4,684+135 −37[5] K |
| Metallicity [Fe/H] | 0.09±0.08[2] dex |
| Age | 7.24±4.72[6] Gyr |
| Other designations | |
CD–28° 14058, HD 164604, HIP 88414, SAO 186165, PPM 267742[7] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 164604 is a single star in the southern constellationofSagittarius 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]
A single super-Jupiter exoplanet was detected by the Magellan Planet Search Program in 2010 based on radial velocity variations of the host star.[11] The orbit of this body does not preclude a hypothetical Earth-mass exoplanet from occupying a dynamically stable orbit within the habitable zone of this star.[13]Anastrometric measurement of the planet's inclination and true mass was published in 2022 as part of Gaia DR3.[14]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Caleuche | 14.3±5.5 MJ | 1.331 ± 0.0029 | 641.47 ± 10.13 | 0.35 ± 0.1 | 29±19° | — |
