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M12 - Globular Cluster in Ophiuchus


From the author of   Sizing Up The Universe

Click here for Hertzsprung-Russell diagram.

Brighter
M12

Dimmer
M12

22:01 EDT Jul 14, 2009.
Starlight Express SXV-H9 on 10" RCOS at f/9.
L = R = G = B = 10 minutes (guided 1-minute subexposures).
Log, Log stretch, Unsharp mask.

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