HD 176051

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HD 176051
Observation data
Epoch J2000      Equinox J2000
Constellation Lyra
Right ascension 18h 57m 01.6105s[1]
Declination +32° 54′ 04.585″[1]
Apparent magnitude (V) 5.22
Spectral type F9V[2] (G0V/K1V)[3]
U−B color index +0.029[4]
B−V color index +0.570[4]
Radial velocity (Rv) −47.2[5] km/s
Proper motion (μ) RA: 202.86[1] mas/yr
Dec.: −143.98[1] mas/yr
Parallax (π) 66.76 ± 0.54[1] mas
Distance 48.9 ± 0.4 ly
(15.0 ± 0.1 pc)
Mass 1.07/0.71[3] M
Surface gravity (log g) 4.60[6] cgs
Temperature 6,000[6] K
Metallicity [Fe/H] −0.11[6] dex
Age 8.1[7] Gyr
Other designations
ADS 11871, HR 7162, BD+32°3267, GJ 738, HD 176051, LTT 15567, SAO 67612, HIP 93017.[2]
Database references

HD 176051 is a spectroscopic binary star system[2] approximately 49 light years away from Earth in the constellation Lyra. The pair orbit with a period of 22,423 days (61.4 years) and an eccentricity of 0.25.[8] Compared to the Sun, they have a somewhat lower proportion of elements more massive than helium.[6] Their individual masses are estimated at 1.07 and 0.71 solar masses (M).[3]

Planetary system[edit]

A planet orbiting one of the stars was discovered through astrometric observations. However, it is not known which stellar component the planet is orbiting around.

The HD 176051 planetary system[9]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 1.5 ± 0.3 MJ 1.76 1016 ± 40 0

The parent star is a binary star. The planet parameters are given for the 0.71 M component B (Muterspaugh et al. 2010). If the planet is orbiting the 1.07 M component A, its mass is 2.26 MJ and a = 2.02 AU.


  1. ^ a b c d e Perryman, M. A. C.; et al. (1997), "The Hipparcos Catalogue", Astronomy & Astrophysics, 323: L49–L52, Bibcode:1997A&A...323L..49P 
  2. ^ a b c "Simbad Query Result: HD 176051 -- Spectroscopic binary". Simbad. Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-07. 
  3. ^ a b c Muterspaugh, Matthew W.; et al. (2006). "Limits to tertiary astrometric companions in binary systems". The Astrophysical Journal. 653 (2): 1469–1479. arXiv:astro-ph/0608640Freely accessible. Bibcode:2006ApJ...653.1469M. doi:10.1086/508743. 
  4. ^ a b Rakos, K. D.; et al. (February 1982). "Photometric and astrometric observations of close visual binaries". Astronomy and Astrophysics Supplement Series. 47: 221–235. Bibcode:1982A&AS...47..221R. 
  5. ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Washington D.C.: Carnegie Institute. Bibcode:1953GCRV..C......0W. 
  6. ^ a b c d Luck, R. E.; Heiter, U. (2006). "Dwarfs in the local region". Astronomical Journal. 131 (6): 3069–3092. Bibcode:2006AJ....131.3069L. doi:10.1086/504080. 
  7. ^ Holmberg, J.; et al. (2007). "The Geneva-Copenhagen survey of the Solar neighbourhood. II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk". Astronomy & Astrophysics. 475: 519–537. arXiv:0707.1891Freely accessible. Bibcode:2007A&A...475..519H. doi:10.1051/0004-6361:20077221. 
  8. ^ Pourbaix, D. '; et al. (2004). SB9: The Ninth Catalogue of Spectroscopic Binary Orbits. Astronomy & Astrophysics. 424. Bibcode:2009yCat....102020P. 
  9. ^ Schneider, J. "Notes for star HD 176051 b". The Extrasolar Planets Encyclopaedia. Retrieved 2010-10-22. 

External links[edit]