| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 18 01 31.228 |
| Declination | 00° 06′ 16.40″ |
| Apparent magnitude (V) | 8.10 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G2V + M6.5V |
| B−V color index | 0.665±0.018 |
| J−H color index | 0.28 |
| J−K color index | 0.36 |
| Astrometry | |
| Radial velocity (Rv) | 13.68±0.16 km/s |
| Proper motion (μ) | RA: −7.876 mas/yr Dec.: −20.462 mas/yr |
| Parallax (π) | 18.6155 ± 0.0219 mas |
| Distance | 175.2 ± 0.2 ly (53.72 ± 0.06 pc) |
| Absolute magnitude (MV) | 4.64 |
| Orbit | |
| Primary | HD 164509 A |
| Companion | HD 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 | |
| Mass | 1.103±0.004 M☉ |
| Radius | 1.041±0.003 R☉ |
| Luminosity | 1.150±0.001 L☉ |
| Surface gravity (log g) | 4.44±0.01 cgs |
| Temperature | 5,865±7 K |
| Metallicity | 0.21 dex |
| Rotational velocity (v sin i) | 2.4±0.5 km/s |
| Age | 1.5±0.2 Gyr |
| HD 164509 B | |
| Mass | 0.45±0.01 M☉ |
| Temperature | 2,710 K |
| Other designations | |
| BD+00 3837, Gaia DR2 4275421969292868224, HD 164509, HIP 88268, 2MASS J18013121+0006163, DENIS J084619.3-080136 | |
| Database references | |
| SIMBAD | 164509 data |
HD 164509 is a binary star system in the constellation of Ophiuchus. The primary component has an orbiting exoplanet companion. This system is located at a distance of 175 light years based on parallax measurements, and is drifting further away with a radial velocity of 13.7 km/s. It has an absolute magnitude of 4.64, but at that distance the system has an apparent visual magnitude of 8.10, which is too faint to be seen with the naked eye.
The primary component is a Sun-like G-type main-sequence star with a stellar classification of G2V. It is young and metal rich, having heavy elements abundance 160% of solar. The star has a modest level of magnetic activity in its chromosphere. It has 1.10 times the mass of the Sun and 1.04 times the Sun's radius. This star is radiating 1.15 times the luminosity of the Sun from its photosphere at an effective temperature of 5,865 K.
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. The evidence for this stellar companion being on a bound orbit was further fortified in 2017.
Planetary system
In 2011, a gas giant, HD 164509 Ab, was discovered orbiting the primary of HD 164509 using Doppler spectroscopy. Given the binary nature of this system, the planet HD 164509 Ab could not have formed on the current orbit, which is unstable in long term. Instead, it may be a captured body formed elsewhere.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| Ab | 0.48±0.09 MJ | 0.875±0.008 | 282.4±3.8 | 0.26±0.14 | — | — |
References
- ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ 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.
- ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ Gonzales, Erica J.; et al. (April 2020), "The TRENDS High-contrast Imaging Survey. VIII. Compendium of Benchmark Objects", The Astrophysical Journal, 893 (1): 27, arXiv:2010.11866, Bibcode:2020ApJ...893...27G, doi:10.3847/1538-4357/ab71fb, S2CID 216296289, 27
- ^ Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
- ^ Giguere, Matthew J.; et al. (2012). "A High-Eccentricity Component in the Double-Planet System Around Hd 163607 and a Planet Around Hd 164509". The Astrophysical Journal. 744 (1): 4. arXiv:1109.2955. Bibcode:2012ApJ...744....4G. doi:10.1088/0004-637X/744/1/4. S2CID 119207947.
- ^ Wittrock, Justin M.; et al. (2016). "Stellar Companions to the Exoplanet Host Stars HD 2638 and HD 164509". The Astronomical Journal. 152 (5): 149. arXiv:1609.00016. Bibcode:2016AJ....152..149W. doi:10.3847/0004-6256/152/5/149. S2CID 45942803.
- ^ Bonfanti, A.; Ortolani, S.; Piotto, G.; Nascimbeni, V. (2015). "Revising the ages of planet-hosting stars". Astronomy & Astrophysics. 575: A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
- ^ Bryan, Marta L.; et al. (April 2016). "Statistics of Long Period Gas Giant Planets in Known Planetary Systems". The Astrophysical Journal. 821 (2): 89. arXiv:1601.07595. Bibcode:2016ApJ...821...89B. doi:10.3847/0004-637X/821/2/89. 89.
- "HD 164509". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-27.
- Ngo, Henry; et al. (2017). "No Difference in Orbital Parameters of RV-detected Giant Planets between 0.1 and 5 au in Single versus Multi-stellar Systems". The Astronomical Journal. 153 (6): 242. arXiv:1704.02326. Bibcode:2017AJ....153..242N. doi:10.3847/1538-3881/aa6cac. S2CID 119106164.
- Quarles, Billy; Li, Gongjie; Kostov, Veselin; Haghighipour, Nader (2020). "Orbital Stability of Circumstellar Planets in Binary Systems". The Astronomical Journal. 159 (3): 80. arXiv:1912.11019. Bibcode:2020AJ....159...80Q. doi:10.3847/1538-3881/ab64fa. S2CID 209444271.
- Fragione, Giacomo (2018). "Dynamical origin of S-type planets in close binary stars". Monthly Notices of the Royal Astronomical Society. 483 (3): 3465–3471. arXiv:1812.02754. Bibcode:2019MNRAS.483.3465F. doi:10.1093/mnras/sty3367. S2CID 119457949.
