CoRoT-7d
CoRoT-7d is an unconfirmed exoplanet that orbits around CoRoT-7, an orange-yellow star younger and smaller than the Sun. This exoplanet is 490 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.
Characteristics
CoRoT-7d's mass is 0.052 times Jupiter, but its volume mass and diameter are unknown. One year on CoRoT-7d is equivalent to 9.021 days on Earth.
Observation
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).
Age
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.