Gliese 667 Cg

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Gliese 667 Cg
Extrasolar planet List of extrasolar planets
Parent star
Star Gliese 667 C
Constellation Scorpius
Right ascension (α) 17h 18m 57.16483s
Declination (δ) −34° 59′ 23.1416″
Apparent magnitude (mV) 11.03
Mass (m) 0.31 M
Radius (r) 0.42 R
Temperature (T) 3700 K
Metallicity [Fe/H] −0.59 ± 0.10
Age 2–10 Gyr
Physical characteristics
Mass (m) 4.41–~9 M
Stellar flux (F) 0.047
Temperature (T) 113 K
Orbital elements
Semimajor axis (a) 0.538 9 ± 0.000 5 AU
Eccentricity (e) 0.107
Orbital period (P) 251.519 d
Discovery information
Discovery date 2013 (predicted earlier)
Discovery method Radial velocity (European Southern Observatory)
Discovery status Unconfirmed

Gliese 667 Cg is an unconfirmed exoplanet orbiting the star Gliese 667 C, which is a member of the Gliese 667 triple star system. Gliese 667 Cg has a minimum mass of 4.41 Earth masses, and cannot be more than 8.82 Earth masses. It is likely an ice planet, with the possibility of a subsurface ocean. Its existence has yet to be confirmed.[1]

Re-analysis of the data by Feroz and Hobson (2014) indicates that the detection of this planet was actually a result of failing to properly account for correlated noise in the radial-velocity data.[2]


  1. ^ Anglada-Escudé, Guillem, et al (2013-06-07). "A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone". Astronomy & Astrophysics. arXiv:1306.6074. Bibcode:2013A&A...556A.126A. doi:10.1051/0004-6361/201321331. Retrieved 2013-06-25. 
  2. ^ Feroz, F.; Hobson, M. P. (2014). "Bayesian analysis of radial velocity data of GJ667C with correlated noise: evidence for only two planets". Monthly Notices of the Royal Astronomical Society 437 (4): 3540–3549. arXiv:1307.6984. Bibcode:2014MNRAS.437.3540F.