HD 148156 is a star with an orbiting exoplanet in the southern constellation of Norma. It is located at a distance of 186 light years away from the Sun,[2] but is drifting closer with a radial velocity of –1.8 km/s.[4] The star has an apparent visual magnitude of 7.69,[1] which is too dim to be visible to the naked eye. A survey in 2015 ruled out the existence of any stellar companions at projected distances from 49 to 345 astronomical units.[9]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Norma[1] |
| Right ascension | 16h 28m 17.285s[2] |
| Declination | –46° 19′ 03.46″[2] |
| Apparent magnitude (V) | 7.69[1] |
| Characteristics | |
| Spectral type | G0/2V[3] |
| Apparent magnitude (B) | 8.250[1] |
| Apparent magnitude (J) | 6.688±0.018[1] |
| Apparent magnitude (H) | 6.489±0.024[1] |
| Apparent magnitude (K) | 6.397±0.023[1] |
| B−V color index | 0.560±0.009[1] |
| Astrometry | |
| Radial velocity (Rv) | –1.806±0.0015[4] km/s |
| Proper motion (μ) | RA: 45.530 mas/yr[2] Dec.: 27.874 mas/yr[2] |
| Parallax (π) | 17.5072 ± 0.0194 mas[2] |
| Distance | 186.3 ± 0.2 ly (57.12 ± 0.06 pc) |
| Absolute magnitude (MV) | 4.13[1] |
| Details | |
| Mass | 1.22±0.01[5] M☉ |
| Radius | 1.19±0.02 R☉[5] 1.302+0.083 −0.041[6] R☉ |
| Luminosity | 1.84±0.03 L☉[5] 2.278±0.008[6] L☉ |
| Surface gravity (log g) | 4.36±0.01[5] cgs |
| Temperature | 6,156±23[5] K |
| Metallicity [Fe/H] | 0.29±0.02[7] dex |
| Rotational velocity (v sin i) | 5.70±1.0[7] km/s |
| Age | 1.20±0.50[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
The spectrum of this star presents as an ordinary G-type main-sequence star with a stellar classification of G0/2V,[3] although Naef and associates in 2010 listed a similar class of F8V.[7] A solar-type star,[7] it is estimated to be approximately 1.2[5] billion years old and is spinning with a projected rotational velocity of 6 km/s.[7] There is only a very low level of magnetic activity in the star's chromosphere.[7] Its metallicity, as measured by the abundance of iron, is almost twice solar.[7] The star has 1.2 times the mass and 1.2 to 1.3 times the radius of the Sun. It is radiating 1.84 to 2.28 times the luminosity of the Sun from its photosphere at an effective temperature of 6,156 K.[5]
Planetary system
editIn 2009, a gas giant planet was found in an eccentric orbit around the star.[7] It may be orbiting within the habitable zone of this star based on incident flux.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 0.85+0.67 −0.05 MJ |
2.45+0.04 −0.05 |
1,027±28 | 0.52+0.04 −0.09 |
— | — |
See also
editReferences
edit- ^ a b c d e f g h i 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.
- ^ a b c d e 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 Houk, N. (1978). "Michigan Catalogue of two dimensional spectral types for the HD stars". Michigan Spectral Survey. 2. Bibcode:1978mcts.book.....H.
- ^ 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.; Ortolani, S.; Nascimbeni, V. (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 Johns, Daniel; et al. (November 2018). "Revised Exoplanet Radii and Habitability Using Gaia Data Release 2". The Astrophysical Journal Supplement Series. 239 (1): 14. arXiv:1808.04533. Bibcode:2018ApJS..239...14J. doi:10.3847/1538-4365/aae5fb. 14.
- ^ a b c d e f g h i Naef, Dominique; et al. (2010). "The HARPS Search for Southern Extrasolar Planets XXIII. 8 Planetary Companions to Low-activity Solar-type Stars". Astronomy and Astrophysics. 523: A15. arXiv:1008.4600. Bibcode:2010A&A...523A..15N. doi:10.1051/0004-6361/200913616. S2CID 118845989.
- ^ "HD 148156". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-24.
- ^ 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. Bibcode:2015MNRAS.450.3127M. doi:10.1093/mnras/stv771. hdl:1887/49340.