Gliese 667 Cc (also known as GJ 667Cc or HR 6426Cc) is an exoplanet 23.62 light years away. It orbits around Gliese 667 C, which is a member of the Gliese 667 triple star system, in the constellation of Scorpius.
Gliese 667Cc has a semi-major axis of only 0.1251 astronomical units, making its year only 28.155 days long.
Based on GJ 667 C's bolometric luminosity, GJ 667 Cc would receive 90% of the light Earth does; however, much of that electromagnetic radiation would be in the invisible infrared light part of the spectrum. In fact, taking into account solely the star's visual luminosity, the planet actually only receives 20% of the visible light Earth does.
Gliese 667Cc is said to be one of the most physically similar known exoplanets to Earth, with an Earth Similarity Index (ESI) value of 0.85. Gliese 667 Cc is similar in size to Earth[dubious– discuss] with a minimum mass of about 3.8 Earth masses. Based on black body temperature calculation, GJ 667 Cc should absorb similar but slightly more overall electromagnetic radiation than Earth, making it a little bit warmer (277.4 K (4.3 °C; 39.6 °F)) and consequently placing it slightly closer to the "hot" inner edge of the habitable zone than Earth (254.3 K (−18.8 °C; −1.9 °F)).