NGC 6144 (also ESO 517-SC6, IC 4606 and GCL 42) is a magnitude +9.0 globular cluster located 29000 light years away in the constellation Scorpius. The cluster is positioned 50' to the ENE of Messier 4.
The cluster was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Datchet, Berkshire, on the 22nd May 1784.
Right Ascension 16h 27m 14.1s, Declination -26° 01' 29"