DY Persei

DY Persei is a variable star in the Perseus constellation, being a prototype star to the very rare type of DY Persei variables, that pulsate like red variables, but also fade from sight like R Coronae Borealis variables. DY Persei itself is an 11th magnitude carbon star that is too dim to see through binoculars. At its faintest it drops below 18th magnitude.