Hercules Globular Cluster, M13
Copyright © 2011
M13, globular cluster in the constellation Hercules.
Distance: 25,100 light years.
Size: 145 light years across with 400,000 to 1,000,000 stars
Camera: SBIG ST-2000XM
Telescope: Astrophysics Starfire 140 EDT F7.5
Mount: Astro-Physics Mach1 GTO with Advanced Telescope Systems portable pier
Images: Exposure was 18 sub images @ 10 minutes each of 4 clear, 4 red, 6 green, and 4 blue for a
total exposure time of 3 hours.
Date: April 2009
Software: Camera, mount, and guider control - CCD Commander & MaximDL, calibration and stacking - CCDStack, further processing in Photoshop CS4.