[5] The primary, CoRoT-7A is a G-type main sequence star, slightly smaller, cooler, and younger than the Sun.
This star is approximately 520 light-years away from the Solar System[2] in the constellation Monoceros (the Unicorn).
[1] The rotation period of the star, inferred by the light curve obtained by CoRoT, is around 23 days.
This star was reported to have stellar activity, making the confirmation process for CoRoT-7b more difficult.
In fact, mass estimates are affected by large uncertainty due to stellar activity that perturbs the radial velocity measurements needed to "weigh" the planets.
[12] The existence of CoRoT-7d was disputed by a 2014 study, which concluded that the radial velocity signal was more likely to be an artifact of the stellar rotation.