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Globular Star Cluster Size Comparison













  Object Globular Star Cluster Size Comparison:
   NGC5139 (Omega Centauri), in Centaurus - 55 arc-seconds
   M13, in Hercules - 20 arc-seconds
   M92, in Hercules - 14 arc-seconds
   NGC1851, in Columba - 12 arc-seconds
  Telescope (Photo) Celestron 8" SCT OTA @ f/6.3 on Losmandy G11 Mount
  Telescope (Guiding) Televue 85mm refractor @ f/5.6 on Losmandy G11 Mount
  Camera (Photo) Canon 20Da DSLR
  Camera (Guiding) Meade DSI Pro II w/PHD Guiding
  Exposure Detail Each cluster:  median combination of 20 images at 60 seconds each, ISO1600; RAW file conversion, full calibration (bias, flat, dark, and flat dark), and initial image processing using ImagesPlus 3.75; final image processing using Photoshop CS3
  Location Private Property at Chiefland Astronomy Village, Florida
(N29.406, W82.860)
  Date 03/25/09 (NGC5139, M13, M92); 03/22/09 (NGC1851)
  Comments All four clusters were taken with identical exposure sequences using identical optical instrumentation, and cropped/processed identically in order to make the comparison precise