55 Cancri e is an exoplanet in the orbit of its Sun-like host star 55 Cancri A. The mass of the exoplanet is about 8.63 Earth masses and its diameter is about twice that of the Earth, thus classifying it as the first super-Earth discovered around a main sequence star, predating Gliese 876 d by a year.

Where is the diamond planet located?

Scientists at Yale University have discovered a nearby super-Earth that is a “diamond planet” — a planet that has a mantle made of graphite and diamond. The planet, called 55 Cancri e, is just 40 light years from Earth and orbits the binary star 55 Cancri, which is located in the constellation of Cancer.

How many 55 Cancri are there?

The 55 Cancri system was the first known to have four, and later five, planets, and may possibly have more. The innermost planet, e, transits 55 Cancri A as viewed from Earth.