Delta Ceti is a star located in the constellation of Cetus. It is classified as a red giant, which means it has expanded and cooled after exhausting the hydrogen in its core. Delta Ceti is approximately 30 light-years away from Earth and has a brightness about 200 times that of the Sun. This star is notable for its variability; it is categorized as a semiregular variable star. This means its brightness changes over time due to pulsations in its outer layers. Delta Ceti is an interesting object for astronomers studying stellar evolution and the life cycles of stars.