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M12, Globular star cluster in the constellation Ophiuchus, NGC 6218
Distance: 16,000 light years.
Camera: SBIG ST-2000XM
Telescope: Astrophysics Starfire 140 EDT F7.5
Mount: Astro-Physics Mach1 GTO with Advanced Telescope Systems portable pier
Images: 5 sub images @ 5 minutes each of clear, red, green, and blue for a total
exposure time of 1 hour 40 minutes.
Date: May 7, 2008
Software: Camera, mount, and guider control - CCD Commander & MaximDL, calibration and stacking - CCDStack, further processing in Photoshop CS2.