Sky at Night Magazine - - BOOKS -

The hub of our Galaxy is rich in glob­u­lars, a great ex­am­ple be­ing M4 (RA 16h 23.6m, dec. –26° 31m; pic­tured). Lo­cated 1.3° west of mag. +1.1 Antares (Al­pha (a) Scor­pii), this mag. +5.6 clus­ter has a bright cen­tral core sur­rounded by an im­pres­sive halo around 12 ar­cmin­utes across. It shows clumps of stars with nu­mer­ous dou­bles and chains in a spec­tac­u­lar star field.

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