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HD 158259
Observation data; Epoch J2000 Equinox J2000
Constellation	Draco
Right ascension	17h 25m 24.055s
Declination	52° 47′ 26.47″
Apparent magnitude (V)	6.46
Characteristics
HD 158259
Evolutionary stage	Main sequence
Spectral type	G0 (G5VmF9)
Astrometry
Radial velocity (Rv)	13.44±0.14 km/s
Proper motion (μ)	RA: −90.678 mas/yr ; Dec.: −49.702 mas/yr
Parallax (π)	37.0177 ± 0.0199 mas
Distance	88.11 ± 0.05 ly ; (27.01 ± 0.01 pc)
Absolute magnitude (MV)	4.27
Details
Mass	0.985 M☉
Radius	1.3 R☉
Luminosity	1.6 L☉
Surface gravity (log g)	4.28 cgs
Temperature	6,068 K
Metallicity [Fe/H]	−0.20 dex
Rotation	18 days
Rotational velocity (v sin i)	3.0 km/s
Other designations
	HIP 85268, 2MASS J17252406+5247263, TYC 3888-1886-1, TOI-1462, GSC 03888-01886
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 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]

The HD 158259 planetary system^[2]^[10]^[9]
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	—	—

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ 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 Hara, N. C.; Bouchy, F.; Stalport, M.; Boisse, I.; Rodrigues, J.; Delisle, J. B.; Santerne, A.; Henry, G. W.; Arnold, L.; Astudillo-Defru, N.; Borgniet, S.; Bonfils, X.; Bourrier, V.; Brugger, B.; Courcol, B.; Dalal, S.; Deleuil, M.; Delfosse, X.; Demangeon, O.; Díaz, R. F.; Dumusque, X.; Forveille, T.; Hébrard, G.; Hobson, M. J.; Kiefer, F.; Lopez, T.; Mignon, L.; Mousis, O.; Moutou, C.; Pepe, F.; Rey, J.; Santos, N. C.; Ségransan, D.; Udry, S.; Wilson, P. A. (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. arXiv:1911.13296. Bibcode:2020A&A...636L...6H. doi:10.1051/0004-6361/201937254. S2CID 208512859.
^ ^a ^b Abt, Helmut A. (2004). "Spectral Classification of Stars in a Supplement to the Bright Star Catalogue". The Astrophysical Journal Supplement Series. 155 (1): 175. Bibcode:2004ApJS..155..175A. doi:10.1086/423803. S2CID 121834568.
^ "HIP 85268 - Facts about the Star". Universe Guide. 25 January 2015. Retrieved February 19, 2022.
^ ^a ^b ^c Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O.; Jordi, C.; Monguio, M.; Romero-Gomez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (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. Retrieved February 19, 2022.
^ ^a ^b Hara, N. C.; Bouchy, F.; Stalport, M.; Boisse, I.; Rodrigues, J.; Delisle, J.-B.; Santerne, A.; Henry, G. W.; Arnold, L.; Astudillo-Defru, N.; Borgniet, S.; Bonfils, X.; Bourrier, V.; Brugger, B.; Courcol, B. (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" (PDF). Astronomy & Astrophysics. 636: L6. doi:10.1051/0004-6361/201937254. ISSN 0004-6361.
^ ^a ^b 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. arXiv:2105.03652. Bibcode:2021CeMDA.133...30P. doi:10.1007/s10569-021-10027-7. S2CID 234340375.
^ Hardegree-Ullman, K. K.; Christiansen, J. L.; Ciardi, D. R.; Crossfield, I. J. M.; Dressing, C. D.; Livingston, J. H.; Volk, K.; Agol, E.; Barclay, T.; Barentsen, G.; Benneke, B.; Gorjian, V.; Kristiansen, M. H. (2021). "K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System". The Astronomical Journal. 161 (5): 219. arXiv:2102.08978. Bibcode:2021AJ....161..219H. doi:10.3847/1538-3881/abeab0. S2CID 231951815.