BD+ 20° 594b (also known as K2-56b[1]) is a massive exoplanet discovered by the Kepler spacecraft in collaboration with the HARPS spectrometer at La Silla in Chile.
[4] Taking the estimates of its radius and mass at face value, the composition of the planet would be rocky, hence making it classified as a mega-Earth.
The planet was discovered on January 28, 2016 by astrophysicist Néstor Espinoza and his team from the Catholic University of Chile, using data from the two-wheeled Kepler mission (K2).
It orbits a K-type star 496.08 light years away in the constellation Taurus.
[5] It is believed that planets with a radius greater than 1.6 times the Earth's are not usually rocky,[6] making BD+20594b an exception to this rule.