M12 - Globular Cluster in Ophiuchus
From the author of Sizing Up The Universe
Click here for Hertzsprung-Russell diagram.
22:35 EDT Jul 11, 2015.
Starlight Express SXV-H9 on 10" RCOS at f/9.
L = 8 min, R = G = B = 6 minutes (unguided 20-second subexposures).
Log stretch, Unsharp mask.
Dimmer
Brighter
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.