Star in the constellation Cetus
7 Ceti is a single,[ 10] variable star in theequatorial constellation ofCetus . It has thevariable star designation AE Ceti.[ 1] naked eye with a baselineapparent visual magnitude of 4.44.[ 3] parallax shift of only[ 2] light years away. It is moving closer to the Sun with a heliocentricradial velocity of −23 km/s.[ 6] Wolf 630 group of co-moving stars.[ 11]
This is an agingred giant star with astellar classification of M1 III,[ 5] asymptotic giant branch .[ 12] Alan William James Cousins announced the detection of variability in the brightness of 7 Ceti.[ 13] [ 14] slow irregular variable of type LB:, and ranges in magnitude from 4.26 down to 4.46.[ 4] semiregular variable with four known periods ranging infrequency from 19.2 to 41.7 days.[ 1] stellar atmosphere of 7 Ceti has expanded to an estimated 54[ 7] Sun's radius . It is radiating around 1,019[ 8] Sun's luminosity from its enlargedphotosphere at aneffective temperature of 3,800 K.[ 8]
Luminosity variation[ 1] Period Amplitude 19.2 0.018 19.6 0.020 27.1 0.018 41.7 0.017
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