CD Cet is a star with 0.16 times the mass of the Sun, and 0.17 times its radius. It is located 28.07 light years away from the solar system and is estimated to be 3 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
CD Cet is known to have 1 exoplanets in orbit around it.
CD Cet b was discovered by the Calar Alto Observatory observatory, in 2020-08, using the radial velocity method. Its semi-major axis is 0.02 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of CD Cet b is 3.953 times the mass of Earth. The radius of CD Cet b is 1.820 that of Earth. At 3.953 Earth masses, CD Cet b is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes. No Super Earths are known to exist in our solar system, but if it exists, the so-called Planet Nine could very well be a super Earth, as it is hypothesized to have a mass between five and ten Earth masses.