RR Coronae Borealis
RR Coronae Borealis ( RR CrB , HD 140297 , HIP 76844 ) is a M3-type semiregular variable star located in the constellation Corona Borealis with a parallax of 2 . 93mas being a distance of . 
<triplet> RR Coronae Borealis <subj> star <obj> instance of <subj> Corona Borealis <obj> constellation <triplet> variable <subj> star <obj> subclass of