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Well done Dan. The mark of a good globular is the core. Al lot of people oversaturate them. Yours is perfect.
From: DarkSkyNewMexico@... [mailto:DarkSkyNewMexico@...]
Sent: Saturday, March 25, 2017 5:38 PM
To: 'Dan Crowson'
Subject: [DarkSkyNewMexico] M12
M12 (NGC 6218) is a Shapley-Sawyer class IX (http://en.wikipedia.org/wiki/Shapley%E2%80%93Sawyer_Concentration_Class) globular cluster located approximately 15,700 light-years away in Ophiuchus.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 17:18:17x300s – 85:90:85 minutes each – binned 2x2
500 minutes total exposure – 8 hours 20 minutes
Imaged over five nights in March, 2017 from Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.