HD 159868

HD 159868 is a yellow dwarf star approximately 182.5 light-years away in the constellation of Scorpius. The star is thought to be 3.05 times more luminous than the Sun, yet the metallicity is identical to the Sun.

HD 159868
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius[1]
Right ascension  17h 38m 59.5264s[2]
Declination −43° 08′ 43.8443″[2]
Apparent magnitude (V) +7.24
Characteristics
Spectral type G5V
Apparent magnitude (J) 5.941±0.021[3]
Apparent magnitude (H) 5.567±0.026[3]
Apparent magnitude (K) 5.535±0.024[3]
Astrometry
Proper motion (μ) RA: −230.510[2] mas/yr
Dec.: −167.766[2] mas/yr
Parallax (π)17.8763 ± 0.0530[2] mas
Distance182.5 ± 0.5 ly
(55.9 ± 0.2 pc)
Absolute magnitude (MV)+3.63[note 1]
Details
Other designations
CD−43°11901, GJ 4014, HIP 86375, SAO 228234[4]
Database references
SIMBADdata

Planetary system
  • In 2007, a planet of the star was announced by astronomer Simon J. O'Toole.[5] The planet (designated HD 159868 b) is likely to be a gas giant. The orbit is extremely eccentric at the average distance of 2 astronomical units (AU), ranging as close as 0.62 AU to as far as 3.38 AU. During its orbital period, the planet spends most of its time in the habitable zone of its star.
  • In 2012, a second planet of the star was announced by astronomer Robert A. Wittenmyer.[6]
The HD 159868 planetary system[5][6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
c >0.73 ± 0.05 MJ 1 ± 0.01 352.3 ± 1.3 0.15 ± 0.05 — —
b >2.1 ± 0.1 MJ 2.25 ± 0.03 1178.4 ± 8.8 0.01 ± 0.03 — —
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See also

References
  1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  2. 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.
  3. Skrutskie, M. F.; et al. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. Vizier catalog entry
  4. "HD 159868". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-10.
  5. O'Toole, Simon J.; et al. (2007). "New Planets around Three G Dwarfs". The Astrophysical Journal. 660 (2): 1636–1641. arXiv:astro-ph/0702213. Bibcode:2007ApJ...660.1636O. doi:10.1086/513563.
  6. Wittenmyer; et al. (2012). "The Anglo-Australian Planet Search. XXII. Two New Multi-planet Systems". The Astrophysical Journal. 753 (2): 169. arXiv:1205.2765. Bibcode:2012ApJ...753..169W. doi:10.1088/0004-637X/753/2/169.

Notes
  1. The calculation for absolute magnitude applied here is , where is the apparent magnitude and is the luminosity distance in parsecs.


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