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| Catalogue and alternative designations | M4,
NGC 6121
|
| Type | Globular Cluster |
| Position | 16 23.6, -26 32 |
| Constellation | Scorpius |
| Camera and Telescope | STXL16200 and 36.8 cm Ritchey Chretien |
| Focal Ratio | F9 |
| Exposure Details | LRGB 83:120:80:100 All 1x1 using Astrodon filters |
| Description | This bright globular cluster is one of the nearest to earth and is visible to the naked eye under a very dark sky. The most noticeable feature is the bar of brighter stars running across the centre (top to bottom). This is visible in quite small telescopes. There is some dust very faintly visible in the field. |