T Cephei

T Cephei is a Mira variable star in the constellation Cepheus. Located approximately 600 ly distant, it varies between magnitudes 5.2 and 11.3 over a period of around 388 days.

T Cephei is a red giant of spectral type M6-9e with an effective temperature 2,400 K, a radius of, a mass of , and a luminosity of. If it were in the place of the Sun, its photosphere would at least engulf the orbit of Mars. This star is believed to be in a late stage of its life, blowing off its own atmosphere to form a white dwarf in a distant future.