M13 - The Hercules Globular Cluster
One of the brightest and largest globulars visible to northern hemisphere observers.

  • RA: 16:42
  • Dec: 36:28
  • Size: 16.6'
  • Magnitude: 5.9
  • Distance: 22,800 ly
  • Constellation: Hercules
  • Millennium Star Atlas: Vol. III, p. 1159
  • Scope: 12.5" Ritchey-Chretien at f/9
  • Autoguider: unguided
  • Sky conditions: Superb transparency, only fair seeing.
  • Film: FLI Dream Machine CCD
  • Exposure: 25x30 seconds L, 8x60 seconds R,G,B
  • Date: 6-16-01 (RGB) and 5-21-02 (L)

A night of superior seeing came along in May of 2002 so I used the opportunity to reshoot the luminance data and improve the overall quality of the shot.


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