M4
NGC 6121
Type: Globular Cluster
Constellation: Scorpio
Magnitude: 5.9
Size: 26.3'
RA-Dec: 16:23:35.41, -26:31:31.9
Difficulty: E E=easy, T=tough, C=challenging
Description:
A globular cluster, 10 billion years old.   Only 7200 light years away, M4 may be the closest globular cluster to our solar system.   The bright red supergiant Antares is only 1.5° west of M4, making it tough to see with the naked eye.   Binoculars reveal M4 as a very bright and round globular.   The cluster's core is loosely concentrated with a string of 10th magnitude and fainter stars running across the center, partially obscured by clouds of interstellar matter.   A remarkable object in any instrument.
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