Messier 13 - Great Hercules Cluster

Full resolution (1600x1200 px  300kB)

200% zoom of M13 (1100x830 px  160kB)

200% zoom of full image (3200x2400 px  580kB)

Object data

Object type: globular cluster (V)
Size: 16.6'
Magnitude: 5.9 mag
Constellation: Her
Distance: 22,000 Ly
Notes: 15 galaxies visible (NGC6207 is the brightest one)

Exposure data

Date: 2005-05-12 (RGB) + 2006-06-12 (L)
Location: Schlierbach / Austria (400m)
Telescope: TeleVue NP101 (4" Apo f=540mm)
Camera: ST2000XM with CFW8 and SBIG Filters
  Binning: L 1x1  /  RGB 1x1
  Exposure time: L 55x2m  / R 6x10m / G 6x5m / B 6x5m
Exposure time total: L 110 min  /  RGB 120 min
Notes: Luminance was captured at full moon!