PSR B1620−26
PSR B1620−26 is a binary star system located at a distance of 3 , 800 parsecs ( 12 , 400 light-years ) in the globular cluster of Messier 4 ( M4 , NGC 6121 ) in the constellation of Scorpius . 
<triplet> PSR B1620−26 <subj> binary star <obj> instance of <subj> Scorpius <obj> constellation <triplet> Messier 4 <subj> globular cluster <obj> instance of <subj> Scorpius <obj> constellation <triplet> Scorpius <subj> constellation <obj> instance of