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HD 156279 - Wikipedia

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HD 156279
Observation data Epoch J2000 Equinox J2000
Constellation	Draco^[1]
Right ascension	17^h 12^m 23.204816^s^[2]
Declination	+63° 21′ 07.531205″^[2]
Apparent magnitude (V)	8.167±0.013^[3]
Characteristics
Evolutionary stage	main-sequence^[4]
Spectral type	K0^[3] or G6^[4]
Apparent magnitude (R)	7.60^[1]
Apparent magnitude (G)	7.8657^[2]
Apparent magnitude (J)	6.677±0.018^[1]
B−V color index	0.801±0.014^[1]
Astrometry

Radial velocity (R_v)	−20.144±0.161^[5] km/s
Proper motion (μ)	RA: −1.879±0.024 mas/yr^[2] Dec.: 160.429±0.027 mas/yr^[2]
Parallax (π)	27.6756 ± 0.0200 mas^[2]
Distance	117.85 ± 0.09 ly (36.13 ± 0.03 pc)
Absolute magnitude (M_V)	5.25^[1]

Details

Mass	0.93±0.02^[6] `M`_☉
Radius	0.94±0.02^[6] `R`_☉
Luminosity	0.70±0.01^[6] `L`_☉
Surface gravity (log g)	4.45±0.03^[6] cgs
Temperature	5,449±31^[6] K
Metallicity [Fe/H]	0.14±0.01^[3] dex
Rotational velocity (v sin i)	2.51±1^[4] km/s
Age	7.4±2.2^[6] Gyr

Other designations
BD+63 1335, Gaia DR2 1631084478574318976, HD 156279, HIP 84171, SAO 17390, PPM 20265, NLTT 44404, TYC 4202-656-1, 2MASS J17122319+6321074^[7]
Database references
SIMBAD	data

HD 156279 is a star with a pair of orbiting exoplanets^[8] located in the northern constellation of Draco.^[1] It has various alternate designations, including HIP 84171 and BD+63 1335. Parallax measurements yield a distance of 118 light years from the Sun,^[2] but it is drifting closer with a radial velocity of −20 km/s.^[5] Despite an absolute magnitude of 5.25,^[1] at that distance the star is too faint to be visible to the naked eye with an apparent visual magnitude of 8.17.^[3] It is presumed to be a single star, as in 2019 all imaging surveys have failed to find any stellar companions.^[3]

The spectrum of HD 156279 has a stellar classification of G6^[4] or K0,^[3] depending on the study. Hence it presents as an ordinary main sequence star^[4] of the late G-type or early K-type. The star has 93% of the mass of the Sun and 94% of the Sun's radius. HD 156279 is roughly seven^[6] billion years old and is spinning with a projected rotational velocity of 2.5 km/s.^[4] Based on the abundance of iron, this star is slightly enriched in heavy elements, having 140% of the solar abundance.^[3] It is radiating 70%^[6] of the luminosity of the Sun from its photosphere at an effective temperature of 5,449 K.^[6]

Planetary system

Orbiting HD 156279 are two superjovian planets, the inner HD 156279 b (discovered in 2011)^[4] and outer HD 156279 c (discovered in 2016).^[8] In 2022, the inclination and true mass of HD 156279 c were measured via astrometry.^[9]

The HD 156279 planetary system^[10]^[9]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥ 9.50+0.31 −0.32 $M$ _J	0.5041+0.0082 −0.0085	133.4031+0.0037 −0.0040	0.64779+0.00068 −0.00066	—	—
c	9.750+1.319 −0.605 $M$ _J	5.486+0.219 −0.240	4818.3+44.5 −43.1	0.261±0.006	74.699+36.999 −10.533°	—

References

^ ^a ^b ^c ^d ^e ^f ^g 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 ^f 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 Biller, B.; et al. (2019), "A high binary fraction for the most massive close-in giant planets and brown dwarf desert members", Monthly Notices of the Royal Astronomical Society, 485 (4): 4967–4996, arXiv:1903.02332, Bibcode:2019MNRAS.485.4967F, doi:10.1093/mnras/stz671, S2CID 84180618.
^ ^a ^b ^c ^d ^e ^f ^g Díaz, Rodrigo F.; et al. (2012), "The SOPHIE search for northern extrasolar planets IV. Massive companions in the planet-brown dwarf boundary", Astronomy & Astrophysics, A113: 538, arXiv:1111.1168, Bibcode:2012A&A...538A.113D, doi:10.1051/0004-6361/201117935, S2CID 55322205.
^ ^a ^b Carrera, R.; et al. (February 2022), "OCCASO. IV. Radial velocities and open cluster kinematics", Astronomy & Astrophysics, 658, arXiv:2110.02110, Bibcode:2022A&A...658A..14C, doi:10.1051/0004-6361/202141832, A14.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ 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.
^ "HD 156279". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 October 2020.
^ ^a ^b Bryan, Marta L.; et al. (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, S2CID 19709252.
^ ^a ^b Feng, Fabo; Butler, R. Paul; et al. (August 2022), "3D Selection of 167 Substellar Companions to Nearby Stars", The Astrophysical Journal Supplement Series, 262 (21): 21, arXiv:2208.12720, Bibcode:2022ApJS..262...21F, doi:10.3847/1538-4365/ac7e57, S2CID 251864022.
^ "HD 156279 Overview", NASA Exoplanet Archive, California Institute of Technology, retrieved 2024-01-10.

Constellation of Draco

Stars

Bayer	α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ¹ (Dziban) ψ² ω
Flamsteed	6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 64 (e) 68
Variable	TW AG BY CL CM CX DO V581
HR	3751 4126 4934 5811 6237 6618 (Alruba) 6817 7137 7783
HD	101364 156279 158259 176693 191939
Other	2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 LP 71-82 Qatar-1 Struve 2398 TOI-1136 WISE 1647+5632

Exoplanets	Orbitar HD 139357 b HD 167042 b Hypatia Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i TOI-1452 b TrES-2b

Star clusters	LAMOST 1

Nebulae	Abell 50 Cat's Eye Nebula

Galaxies

NGC	3147 4121 4125 4236 4319 4345 4513 4589 5678 5777 5866 5866B 5879 5906 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6566 6621 6622 6670 6676 6786 6789
Other	1ES 1959+650 3C 249.1 3C 305 3C 319 3C 356 3C 371 3C 390.3 3C 401 4C +72.26 H1821+643 HFLS3 KKR 25 Markarian 876 PGC 39058 S5 1803+784 S5 2007+777 UGC 9391

Galaxy clusters	Abell 2218 CL1358+62 Draco Supercluster

Astronomical events	Swift J1644+57 SN 2005B SN 2016aps