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M4 - Globular Cluster in Scorpius

From the author of   Sizing Up The Universe

Click here for Hertzsprung-Russell diagram.


22:18pm EDT Jun 15, 2006.
Starlight Express SXV-H9 on Tak FSQ106 at f/5.
L = 20 min, R = 3 min, G = 6 min, B = 9 min (guided 1-minute subexposures).
Limiting sky mag: L = 14.3.
Log stretch, Unsharp mask.

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