HD 155358

HD 155358
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 17h 09m 34.61749s[1]
Declination +33° 21′ 21.0850″[1]
Apparent magnitude (V) 7.275±0.005
Characteristics
Spectral type G0[2]
B−V color index 0.523
Astrometry
Radial velocity (Rv)-9.1 km/s
Proper motion (μ) RA: -222.45[1] mas/yr
Dec.: -215.97[1] mas/yr
Parallax (π)22.67 ± 0.48 mas[1]
Distance144 ± 3 ly
(44.1 ± 0.9 pc)
Absolute magnitude (MV)4.12
Details
Mass0.83+0.03
−0.02[3] M☉
Radius1.39±0.06 R☉
Surface gravity (log g)4.05±0.10[2] cgs
Temperature5921±70[2] K
Metallicity21% solar[4]
Age3.3+1.3
−1.6[3] Gyr
Other designations
BD+33 2840, SAO 65834, Wolf 646, HIP 83949[2]
Database references
SIMBADdata

HD 155358 is a low metallicity yellow dwarf star approximately 43 pc away[5] in the constellation Hercules. This star is known to be orbited by two extrasolar planets.[4]

The star is 11.9 billion years old and has a mass 0.89 times that of the Sun.[3] At the time of the planets' discoveries, it was notable for being the lowest metallicity planet-bearing star known, with an iron-to-hydrogen ratio 21% of the solar value.[4]

  1. ^ a b c d e van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. ^ a b c d "HD 155358". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-09-04.
  3. ^ a b c Nordstrom B.; Mayor M.; Andersen J.; Holmberg J.; Pont F.; Jorgensen B.R.; Olsen E.H.; Udry S.; Mowlavi N. (2004). "The Geneva-Copenhagen Survey of Solar neighbourhood". Centre de Données astronomiques de Strasbourg. Retrieved 2007-09-04.
  4. ^ a b c Cochran, W.; et al. (2007). "A Planetary System Around HD 155358: The Lowest Metallicity Planet Host Star". The Astrophysical Journal. 665 (2): 1407–1412. arXiv:0705.3228. Bibcode:2007ApJ...665.1407C. doi:10.1086/519555. S2CID 14591389.
  5. ^ Bernkopf J., Fuhrmann K. (March 2008). "On the thick-disc exoplanet host subgiant HD 155358". Monthly Notices of the Royal Astronomical Society. 384 (4): 1563–1566. Bibcode:2008MNRAS.384.1563F. doi:10.1111/j.1365-2966.2007.12806.x.