北冕座R
At its discovery it was described simply as "the variable in the Northern crown". It was later referred to as "Variabilis Coronae", "Variable (star) of Corona (Borealis)". It has also been called a "reverse nova" because of its habit of fading from sight. The variable star designation R Coronae Borealis was introduced, as "Coronae R" by Friedrich Wilhelm Argelander in 1850.