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Classification: Galaxies Cluster
Constellation: Hercules (HER)
Object Location: Ra 16h 05m 45s Dec +17° 40’54° (current)
Size & Distance: 137 x 137 Apx 500 million light-years.

Date & Location: 05-03-2011 Joshua Tree National Park.
Exposure: LRGB L= 6 @ 10min (bin 1x1) RGB= 3 ea. @ 10min (bin 2x2)
Optics: Telescope Engineering Company APO160FL @ f/7.2 F/L 1152mm.
Mount: Astro-Physics 900 GTO / ATS 10x36 Pier
Camera: SBIG-ST10XME / Guided by TV60APO / w SBIG ST-402
Filters: Astrodon G2 LRGB
Software: MaxImDL 4.56, Photoshop CS5.

Notes: Sky conditions: Good seeing, calm winds, low 60’s
Image Field of view is 30 x 44 arc-min.

The Hercules Cluster (Abell 2151) is a cluster of about 200 galaxies about 500 million light-years distant in the constellation Hercules. It’s rich in spiral galaxies and shows many interacting galaxies. The cluster is part of the larger Hercules Supercluster, which is itself part of the much larger Great Wall super-structure.

“Great Wall", a sheet of galaxies more than 500 million light-years long and 200 million wide, but only 15 million light-years thick.