Jupiter Tau Ceti is a binary star system in the constellation of Cetus, about 30 light-years away from the Sun.It is considered to be a close binary, with a separation of 4 arcminutes, and an estimated orbital period of 20,000 years.The primary component is a red giant of spectral type M5III that has an effective temperature of 4,990 K. With a mass of about and diameter of , it is the largest star in the Large Magellanic Cloud.The secondary is a K-type supergiant with a spectral type K3III, bright enough to be seen with the naked eye from the Southern Hemisphere.Together they make up one of the most luminous red giants in the Galaxy,