tau Cet is a star with 0.78 times the mass of the Sun, and NaN times its radius. It is located 11.75 light years away from the solar system.
tau Cet is known to have 4 exoplanets in orbit around it.
tau Cet e was discovered by the Multiple Observatories observatory, in 2017-10, using the radial velocity method. Its semi-major axis is 0.54 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of tau Cet e is 3.934 times the mass of Earth. The radius of tau Cet e is 1.810 that of Earth. At 3.934 Earth masses, tau Cet e 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. tau Cet e orbits within the habitable zone of its parent star and could, potentially, be a habitable planet with stable bodies of liquid water on its surface, like Earth.
tau Cet f was discovered by the Multiple Observatories observatory, in 2017-10, using the radial velocity method. Its semi-major axis is 1.33 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of tau Cet f is 3.934 times the mass of Earth. The radius of tau Cet f is 1.810 that of Earth. At 3.934 Earth masses, tau Cet f 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. With a mass below 5 Earth masses, and a semi-major axis of 1.334 astronomical units, which is outside the habitable zone of tau Cet, tau Cet f is likely an icy world.
tau Cet g was discovered by the Multiple Observatories observatory, in 2017-10, using the radial velocity method. Its semi-major axis is 0.13 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of tau Cet g is 1.752 times the mass of Earth. The radius of tau Cet g is 1.180 that of Earth. At 1.752 Earth masses, tau Cet g 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.
tau Cet h was discovered by the Multiple Observatories observatory, in 2017-10, using the radial velocity method. Its semi-major axis is 0.24 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of tau Cet h is 1.832 times the mass of Earth. The radius of tau Cet h is 1.190 that of Earth. At 1.832 Earth masses, tau Cet h 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.