• CroAstro
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M4 Globular cluster in Scorpion

M4 is one of the nearest globular clusters in the sky; its distance is perhaps only about 7,200 light years. M4 can be detected by the naked eye under very dark skies (1.3 degrees west of Antares, visual brightness 5.6 mag), and is prominent with the slightest optical aid. Refractor William Optics FLT98 (98/618 mm), TeleVue field flattener/reducer 0,8x, Lumicon DeepSky filter, SBIG ST8300 CCD camera, -7C; guided on QHY5 , 8x8 minutes exposure. July 2012.