Gliese 667 Cd is an unconfirmed exoplanet orbiting the star Gliese 667 C, which is a member of the Gliese 667 triple star system. It is slightly more massive than Gliese 667 Cc. It is likely an ice planet, located outside the system's habitable zone, and it has been suggested that Gliese 667 Cd could have a ocean under the ice.
The existence of Gliese 667Cd was theorized in 2012 and was supported by a follow-up study in 2013. Reanalysis of the data by Feroz and Hobson (2014) however indicates that the detection of this planet was actually a result of failing to properly account for correlated noise in the radial-velocity data.
In left column are stellar classes of primary members of star systems. Bold are systems containing at least one component with absolute magnitude of +8.5 or brighter. Italic are systems without known trigonometric parallax.