7 Ceti (450 Light years away (1 = 9.46 trillion kilometres)) has four luminosity variations, one of which was 19.2 days with an Amplitude of .018.
Based upon an annual parallax shift of only 7.3 mas, it is located roughly 450 light years away. The light-year is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometres (9.4610 km) or 5.88 trillion miles (5.8810 mi). Luminosityvariation 19.2 0.018 19.6 0.020 27.1 0.018 41.7 0.017 
