HD 114386 is a star with a pair of orbiting exoplanets in the southern constellation of Centaurus. It has an apparent visual magnitude of 8.73,[2] which means it cannot be viewed with the naked eye but can be seen with a telescope or good binoculars. Based on parallax measurements, the system is located at a distance of 91 light years from the Sun. It is receding with a radial velocity of 33.4 km/s.[3] The star shows a high proper motion, traversing the celestial sphere at an angular rate of 0.318 arcsec yr−1.[7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h 10m 39.824s[1] |
| Declination | −35° 03′ 17.21″[1] |
| Apparent magnitude (V) | 8.73[2] |
| Characteristics | |
| Spectral type | K3 V[2] |
| B−V color index | 0.982[2] |
| Astrometry | |
| Radial velocity (Rv) | 33.350±0.0004[3] km/s |
| Proper motion (μ) | RA: −137.143 mas/yr[1] Dec.: −324.874 mas/yr[1] |
| Parallax (π) | 35.7355 ± 0.0200 mas[1] |
| Distance | 91.27 ± 0.05 ly (27.98 ± 0.02 pc) |
| Absolute magnitude (MV) | 6.49[2] |
| Details | |
| Mass | 0.76±0.01[4] M☉ |
| Radius | 0.73±0.01[4] R☉ |
| Luminosity | 0.28±0.01[4] L☉ |
| Surface gravity (log g) | 4.58±0.02[4] cgs |
| Temperature | 4,926±13[4] K |
| Metallicity [Fe/H] | −0.012[5] dex |
| Rotational velocity (v sin i) | 3.06[5] km/s |
| Age | 8.8±2.8[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The spectrum of HD 114386 yields a stellar classification of K3 V,[2] matching a K-type main-sequence star, or orange dwarf. It has 76% of the mass of the Sun and 73% of the Sun's radius. HD 114386 is a much older star than the Sun with an estimated age of roughly nine billion years.[4] The abundance of iron in the stellar atmosphere, a measure of the star's metallicity, is nearly solar.[5] It is rather dim compared to the Sun, radiating just 28% of the luminosity of the Sun from its photosphere at an effective temperature of 4,926 K.[4]
Planetary system
editIn 2004, the Geneva Extrasolar Planet Search Team announced the discovery of an extrasolar planet orbiting the star.[2] The preliminary data for a second exoplanet was released in 2011.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥0.37 MJ | 1.65[9] | 445 | 0.12 | — | — |
| c | ≥1.19 MJ | – | 1,046 | 0.06 | — | — |
See also
editReferences
edit- ^ 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.
- ^ a b c d e f g h Mayor, M.; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics. 415 (1): 391–402. arXiv:astro-ph/0310316. Bibcode:2004A&A...415..391M. doi:10.1051/0004-6361:20034250. S2CID 5233877.
- ^ a b 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.
- ^ a b c d e f g h Bonfanti, A.; et al. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: 14. arXiv:1511.01744. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297. S2CID 53971692. A5.
- ^ a b c Rice, Malena; Brewer, John M. (August 2020). "Stellar Characterization of Keck HIRES Spectra with The Cannon". The Astrophysical Journal. 898 (2): 119. arXiv:2007.02942. Bibcode:2020ApJ...898..119R. doi:10.3847/1538-4357/ab9f96. 119.
- ^ "HD 114386". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-01-09.
- ^ Luyten, W. J. (June 1995). "NLTT Catalogue (Luyten, 1979)". VizieR Online Data Catalog. Bibcode:1995yCat.1098....0L.
- ^ a b Mayor, M.; et al. (September 2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497 [astro-ph.EP].
- ^ "Confirmed Planets". NASA Exoplanet Archive. California Institute of Technology. Archived from the original on 12 December 2012.