Tau Ceti is a star mentioned in the episode "The Impossible Dram" as the location of a medical facility. It is unsure whether the facility is orbiting the star or located on a planet in the star's system. Tau Ceti's medical facility is where Dram is being transported to when the transport ship is destroyed and his cryopod is set adrift in space.
Tau Ceti is just under 12 light-years away from the Solar System. It can be seen with the naked eye. Potentially two of a possible five planets orbiting the star are in the star's habitable zone. Tau Ceti is a popular target in the search for extraterrestrial life as it is similar to the Sun and close to our solar system.