HD 156279

HD 156279 is a type K0 star, located 36.5 pc away from Earth (119.1 light years). It has various alternate designations, including HIP 84171 and BD+63 1335. It is presumed to be a single star, as in 2019 all imaging surveys have failed to find a stellar companions.[2]

HD 156279
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 17h 12m 23.20514s[1]
Declination +63° 21′ 07.5347″[1]
Apparent magnitude (V) 8.167[2]
Characteristics
Evolutionary stage main-sequence star
Spectral type K0
Apparent magnitude (R) 7.6
Apparent magnitude (G) 7.8657
Apparent magnitude (J) 6.677
B−V color index 0.80[3]
Astrometry
Radial velocity (Rv)-20.6432 km/s
Proper motion (μ) RA: -2.026[4] mas/yr
Dec.: 160.207[4] mas/yr
Parallax (π)27.5995 ± 0.0273[1] mas
Distance118.2 ± 0.1 ly
(36.23 ± 0.04 pc)
Details
Mass0.93[5] M☉
Radius0.95[6] R☉
Luminosity0.81[7] L☉
Temperature5453[6] K
Metallicity [Fe/H]0.14±0.01[2] dex
Age4[5] Gyr
Other designations
BD+63 1335, Gaia DR2 1631084478574318976, HIP 84171, SAO 17390, TYC 4202-656-1, 2MASS J17122319+6321074[6]
Database references
SIMBADdata

Characteristics

HD 156279 has a stellar mass of 0.93 and a stellar radius of 0.95. It has a metallicity of 0.14 and an effective temperature of 5453 Kelvin. HD 156279 is 4 billion years old and based on the spectral type, K0, it is an orange colour.[6] HD 156279 has an apparent magnitude of 8.167[2] and an absolute magnitude of 5.27.[8][9] The star is slightly enriched in heavy elements, having 140% of solar abundance.[2]

Planetary system

Orbiting HD 156279 are two superjovian planets, an inner HD 156279 b (discovered in 2011)[8] and outer HD 156279 c (discovered in 2016).[3]

The HD 156279 planetary system[10][11]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
HD 156279 b ≥9.71±0.66 MJ 0.495±0.017 131.05±0.54 0.708±0.018 — 1.11 RJ
HD 156279 c ≥8.6±0.55 MJ — 4191+270
−310		 0.23±0.02 — 0.9 RJ

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Biller, B.; Mužić, K.; Lopez, E.; Bonavita, M.; Rice, K.; Fontanive, C.; Biller, B. (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
  3. Bryan, Marta L.; Knutson, Heather A.; Howard, Andrew W.; Ngo, Henry; Batygin, Konstantin; Crepp, Justin R.; Fulton, B. J.; Hinkley, Sasha; Isaacson, Howard; Johnson, John A.; Marcy, Geoffry W.; Wright, Jason T. (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
  4. "HD 156276". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 October 2020.
  5. openexoplanetcatalogue.com
  6. NASA archive
  7. universeguide.com
  8. Díaz, R. F.; Santerne, A.; Sahlmann, J.; Hébrard, G.; Eggenberger, A.; Santos, N. C.; Moutou, C.; Arnold, L.; Boisse, I.; Bonfils, X.; Bouchy, F.; Delfosse, X.; Desort, M.; Ehrenreich, D.; Forveille, T.; Lagrange, A. M.; Lovis, C.; Pepe, F.; Perrier, C.; Queloz, D.; Ségransan, D.; Udry, S.; Vidal-Madjar, A. (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
  9. exoplanetkyoto.org
  10. HD 82886 b on exoplanet.eu
  11. HD 82886 c on exoplanet.eu


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