HD 156279
Observation data
Epoch J2000      Equinox J2000
Constellation Draco[1]
Right ascension 17h 12m 23.204816s[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 (Rv)−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]
Distance117.85 ± 0.09 ly
(36.13 ± 0.03 pc)
Absolute magnitude (MV)5.25[1]
Details
Mass0.93±0.02[6] M☉
Radius0.94±0.02[6] R☉
Luminosity0.70±0.01[6] L☉
Surface gravity (log g)4.45±0.03[6] cgs
Temperature5,449±31[6] K
Metallicity [Fe/H]0.14±0.01[3] dex
Rotational velocity (v sin i)2.51±1[4] km/s
Age7.4±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
SIMBADdata

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 MJ		 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 MJ		 5.486+0.219
−0.240		 4818.3+44.5
−43.1		 0.261±0.006 74.699+36.999
−10.533°		 —

References

  1. 1 2 3 4 5 6 7 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.
  2. 1 2 3 4 5 6 7 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.
  3. 1 2 3 4 5 6 7 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.
  4. 1 2 3 4 5 6 7 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.
  5. 1 2 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.
  6. 1 2 3 4 5 6 7 8 9 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.
  7. ↑ "HD 156279". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 October 2020.
  8. 1 2 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.
  9. 1 2 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.
  10. ↑ "HD 156279 Overview", NASA Exoplanet Archive, California Institute of Technology, retrieved 2024-01-10.
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