HD 187123 b

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HD 187123 b
Exoplanet List of exoplanets
Parent star
Star HD 187123
Constellation Cygnus
Right ascension (α) 19h 46m 58.113s[1]
Declination (δ) +34° 25′ 10.28″[1]
Distance157±4[1] ly
(48±1[1] pc)
Spectral type G5V
Orbital elements
Semi-major axis(a) 0.04213±0.00034[2] AU
Eccentricity (e) 0.0093±0.0046[2]
Orbital period(P) 3.0965886±0.0000043[2] d
Argument of
(ω) 360±200[2]°
Time of periastron (T0) 2454342.87±0.30[2] JD
Semi-amplitude (K) 68.91±0.36[2] m/s
Physical characteristics
Minimum mass(m sin i)0.5074±0.0026[2] MJ
Discovery information
Discovery date 9 September 1998
Discoverer(s) Butler, Marcy,
Vogt, Apps et al.
Discovery method radial velocity
Discovery site California, United States
Discovery status Published

HD 187123 b is a typical "hot Jupiter" located approximately 156 light-years away in the constellation of Cygnus, orbiting the star HD 187123. It has a mass about half that of Jupiter and it orbits in a very tight, round orbit around the star every three days.[3][4]

The star has also been monitored for possible transits by the planet, but none was found.

See also[edit]


  1. ^ a b c d van Leeuwen, F. (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.Vizier catalog entry
  2. ^ a b c d e f g Feng, Y. Katherina; et al. (2015). "The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets". The Astrophysical Journal. 800. 22. arXiv:1501.00633. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22.
  3. ^ Butler, R. Paul; et al. (1998). "A Planet with a 3.1 Day Period around a Solar Twin". Publications of the Astronomical Society of the Pacific. 110 (754): 1389–1393. Bibcode:1998PASP..110.1389B. doi:10.1086/316287.
  4. ^ Wright, J. T.; et al. (2009). "Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems". The Astrophysical Journal. 693 (2): 1084–1099. arXiv:0812.1582. Bibcode:2009ApJ...693.1084W. doi:10.1088/0004-637X/693/2/1084.

External links[edit]

Coordinates: Sky map 19h 46m 58.1130s, +34° 25′ 10.288″