HD 187123 c

HD 187123 c
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) 4.417±0.054[2] AU
Eccentricity (e) 0.280±0.022[2]
Orbital period(P) 3324±46[2] d
Argument of
periastron		 (ω) 258.5±3.9[2]°
Time of periastron (T0) 2453625±40[2] JD
Semi-amplitude (K) 25.10±0.44[2] m/s
Physical characteristics
Minimum mass(m sin i)1.818±0.035[2] MJ
Discovery information
Discovery date November 2006
Discoverer(s) Wright et al.
Discovery method radial velocity
Discovery site California, USA
Discovery status Published

HD 187123 c is an extrasolar planet located approximately 156 light-years away in the constellation of Cygnus, orbiting the star HD 187123. This planet was published in 2006. The radius of the planet's orbit is 4.80 AU, 113 times more distant from the star than first companion. This takes 10 years to orbit. As it is typical for very long-period planets, the orbit is eccentric, referring to as "eccentric Jupiter". At periastron, the orbital distance is 3.60 AU and at apastron, the distance is 6.00 AU. The planet's mass is nearly 2 times that of Jupiter, but is likely to be smaller in size than the inner planet.[3][4]

See also

References

  1. 1 2 3 4 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. 1 2 3 4 5 6 7 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. ↑ Wright, J. T.; et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal. 657 (1): 533–545. arXiv:astro-ph/0611658. Bibcode:2007ApJ...657..533W. doi:10.1086/510553.
  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.
  • "Notes for planet HD 187123 c". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-25.
  • "HD 187123". Exoplanets. Retrieved 2008-08-25.

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


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