Astronomy:HD 158259
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Short description: Star in the constellation Draco
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Draco |
| Right ascension | 17h 25m 24.055s[1] |
| Declination | 52° 47′ 26.47″[1] |
| Apparent magnitude (V) | 6.46[2] |
| Characteristics | |
| HD 158259 | |
| Evolutionary stage | Main sequence |
| Spectral type | G0[2] (G5VmF9[3]) |
| Astrometry | |
| Radial velocity (Rv) | 13.44±0.14[1] km/s |
| Proper motion (μ) | RA: −90.678[1] mas/yr Dec.: −49.702[1] mas/yr |
| Parallax (π) | 37.0177 ± 0.0199[1] mas |
| Distance | 88.11 ± 0.05 ly (27.01 ± 0.01 pc) |
| Absolute magnitude (MV) | 4.27[4] |
| Details | |
| Mass | 0.985[1] M☉ |
| Radius | 1.3[1] R☉ |
| Luminosity | 1.6[1] L☉ |
| Surface gravity (log g) | 4.28[5] cgs |
| Temperature | 6,068[5] K |
| Metallicity [Fe/H] | −0.20[5] dex |
| Rotation | 18 days[2] |
| Rotational velocity (v sin i) | 3.0[6] km/s |
| Other designations | |
HIP 85268, 2MASS J17252406+5247263, TYC 3888-1886-1, TOI-1462, GSC 03888-01886[7] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 158259 is a main sequence star located 88 light-years (27 parsecs) away in the constellation Draco. It hosts a system of at least five planets, discovered by the SOPHIE échelle spectrograph using the radial velocity method.[2]
Characteristics
HD 158259 is a G0 star with a rotation period of 18±5 days. More detailed analysis of the spectral assigns a class of G5V, but with the metal lines of an F9 star.[3]
Planets
Five planets have been confirmed orbiting HD 158259, along with one unconfirmed planet. These planets were discovered by N.C. Hara et.al. by the radial velocity method, published in Astronomy & Astrophysics in April of 2020.[8] The innermost planet, HD 158259 b, was also observed to transit the star by TESS.[2] The planets orbit in a nearly 3:2 orbital resonance, with the period ratios 1.5758, 1.5146, 1.5296, 1.5130, and 1.4480, respectively, starting from the innermost pairing.[9] A dynamical analysis has shown that the system is stable.[2] One of the planets, HD 158259 b, is a super-Earth; the rest, including the unconfirmed HD 158259 g, are mini-Neptunes.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 2.2 M⊕ | 0.034 | 2.177±0.44 | <0.1 | — | ~1.2 R⊕ |
| c | 5.6 M⊕ | 0.046 | 3.432±0.00002 | <0.1 | — | — |
| d | 5.4 M⊕ | 0.060 | 5.198±0.008 | <0.1 | — | — |
| e | 6.1 M⊕ | 0.080 | 7.954±0.0016 | <0.1 | — | — |
| f | 6.1 M⊕ | 0.105 | 12.03±0.0028 | <0.1 | — | — |
| g (unconfirmed) | 6.9 M⊕ | 0.135 | 17.39±0.023 | <0.1 | — | — |
See also
- List of exoplanets discovered in 2020 - HD 158259 b, c, d, e, and f
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Hara, N. C.; Bouchy, F.; Stalport, M.; Boisse, I.; Rodrigues, J.; Delisle, J. B.; Santerne, A.; Henry, G. W. et al. (March 10, 2020). "The SOPHIE search for northern extrasolar planets XVI. HD 158259: A compact planetary system in a near-3:2 mean motion resonance chain". Astronomy & Astrophysics 636 (1): L6. doi:10.1051/0004-6361/201937254. Bibcode: 2020A&A...636L...6H.
- ↑ 3.0 3.1 Abt, Helmut A. (2004). "Spectral Classification of Stars in a Supplement to the Bright Star Catalogue". The Astrophysical Journal Supplement Series 155 (1): 175. doi:10.1086/423803. Bibcode: 2004ApJS..155..175A.
- ↑ "HIP 85268 - Facts about the Star". Universe Guide. 25 January 2015. https://www.universeguide.com/star/85268/hip85268. Retrieved February 19, 2022.
- ↑ 5.0 5.1 5.2 Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O. et al. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode: 2022yCat.1354....0A.
- ↑ Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G 3244. Bibcode: 2005yCat.3244....0G.
- ↑ "HD 158259". SIMBAD. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+158259. Retrieved February 19, 2022.
- ↑ 8.0 8.1 Hara, N. C.; Bouchy, F.; Stalport, M.; Boisse, I.; Rodrigues, J.; Delisle, J.-B.; Santerne, A.; Henry, G. W. et al. (April 2020). "The SOPHIE search for northern extrasolar planets: XVI. HD 158259: A compact planetary system in a near-3:2 mean motion resonance chain". Astronomy & Astrophysics 636: L6. doi:10.1051/0004-6361/201937254. ISSN 0004-6361. https://www.aanda.org/articles/aa/pdf/2020/04/aa37254-19.pdf.
- ↑ 9.0 9.1 Papaloizou, J. C. B. (June 12, 2021). "The orbital evolution of resonant chains of exoplanets incorporating circularisation produced by tidal interaction with the central star with application to the HD 158259 and EPIC 245950175 systems". Celestial Mechanics and Dynamical Astronomy 133 (6): 30. doi:10.1007/s10569-021-10027-7. Bibcode: 2021CeMDA.133...30P.
- ↑ Hardegree-Ullman, K. K.; Christiansen, J. L.; Ciardi, D. R.; Crossfield, I. J. M.; Dressing, C. D.; Livingston, J. H.; Volk, K.; Agol, E. et al. (2021). "K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System". The Astronomical Journal 161 (5): 219. doi:10.3847/1538-3881/abeab0. Bibcode: 2021AJ....161..219H.
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