Astronomy:HD 164604
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[4] mas |
| 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 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
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]
Planetary system
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] An astrometric 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° | — |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 Gray, R. O. et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 4.2 4.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 5.0 5.1 5.2 5.3 5.4 Feng, Fabo et al. (June 2019). "Search for Nearby Earth Analogs. I. 15 Planet Candidates Found in PFS Data". The Astrophysical Journal Supplement Series 242 (2): 31. doi:10.3847/1538-4365/ab1b16. 25. Bibcode: 2019ApJS..242...25F.
- ↑ 6.0 6.1 Pace, G. (March 2013), "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram", Astronomy & Astrophysics 551: 4, doi:10.1051/0004-6361/201220364, L8, Bibcode: 2013A&A...551L...8P.
- ↑ "HD 164604". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+164604.
- ↑ "Approved names" (in en). http://www.nameexoworlds.iau.org/final-results.
- ↑ "Name Exo Worlds". International Astronomical Union | IAU. https://www.iau.org/news/pressreleases/detail/iau1912/.
- ↑ Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society 450 (3): 3127–3136. doi:10.1093/mnras/stv771. Bibcode: 2015MNRAS.450.3127M. https://academic.oup.com/mnras/article/450/3/3127/1063872. Retrieved 19 June 2020.
- ↑ 11.0 11.1 Arriagada, Pamela et al. (2010). "Five Long-period Extrasolar Planets in Eccentric orbits from the Magellan Planet Search Program". The Astrophysical Journal 711 (2): 1229–35. doi:10.1088/0004-637X/711/2/1229. Bibcode: 2010ApJ...711.1229A.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ Agnew, Matthew T. et al. (November 2017). "Stable habitable zones of single Jovian planet systems". Monthly Notices of the Royal Astronomical Society 471 (4): 4494–4507. doi:10.1093/mnras/stx1449. Bibcode: 2017MNRAS.471.4494A.
- ↑ 14.0 14.1 Gaia Collaboration et al. (2023). "Gaia Data Release 3". Astronomy & Astrophysics 674: A34. doi:10.1051/0004-6361/202243782.
Coordinates: 
18h 03m 06.95s, −28° 33′ 38.3″
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