The Globular Cluster in Ophiuchus ... Messier 12



Globular Cluster in Ophiuchus (Messier 12)
M12 is located at a distance of 18,000 light-years and is estimated to be 12.6 billion years old. It contains about 70,000 stars. I took this one hour image June 26, 2019 between 1 and 2 am. This cluster is high in the sky around midnight in late June.

Techy Stuff:
Telescope: 11" Celestron Edge HD at f/7
Reducer: Celestron 0.7X Focal Reducer
Camera: Altair #Hypercam294c Pro TEC
Sensor Temperature: -5C (23F)
Filter: City Light Pollution Suppression
Capture software: #SharpCap Pro V 3.2
Guiding: PHD 2 (RMS error: 0.45 ... i.e. tracking a bit off)
Mount: CGX
Mount controls: Celestron PWI V2.1.25
Polar Alignment: QHY Pole Master
Light Frames used: 57 at 60 seconds / Gain: 25,000
Binning: 2x2
Dark Frames: 30
Bias Frames: 30
Flat Frames: None
Stacked in Deep Sky Stacker
Post Processed in PixInsight and Photoshop CC
Seeing Conditions: 8 (0-10, where 0 is total cloud cover)
Moon: No Lunar Interference
Bortle Light-Pollution zone: 4.5 (can barely see the Milkyway)
Air Temperature: 77F
Date: June 26, 2019 from 1:00 am - 2:00 am
Location: Backyard, Savannah GA


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