Celestial hemisphere:  Southern  ·  Constellation: Scorpius (Sco)  ·  Contains:  M 4  ·  NGC 6121
Messier 4 - A reddish globular cluster, deppski
Messier 4 - A reddish globular cluster
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Messier 4 - A reddish globular cluster

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Description

The two closest M4 got a reddish color, because its light passes a lot of interstellar dust.

I did this snapshot without guiding. 130/700mm Newton, 60 x 18s exposures ISO1600.

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Messier 4 - A reddish globular cluster, deppski