CoRoT-7d is an unconfirmed exoplanet that orbits around CoRoT-7, an orange-yellow star younger and smaller than the Sun. This exoplanet is approximately 489 light-years away from the solar system in the constellation Monoceros (the Unicorn). A planetary system of two or three planets was detected around this star:
This exoplanet was discovered by A. P. Hatzes and al in 2010 by radial speeds. The nature of CoRoT-7d is not definitively confirmed.
Because of its closeness to its star and its apparent magnitude of +11.7, the exoplanet cannot be seen in a telescope, only its gravitational effect can be detected by Doppler–Fizeau effect on its electromagnetic spectrum (radial speed method).
Because CoRoT-7 is believed to be about 1,500,000,000 years old, we estimate the age of CoRoT-7d at between 500,000,000 and 1,000,000,000 years.