M12 - Globular Cluster

  
 
 
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  • RA: 16:47.2
  • Dec: -01:57
  • Magnitude: 6.7
  • Distance: 16,000 ly
  • Size:  14.5 arc min
  • Constellation:  Ophiuchus
  • Scope: 8" SCT at f/10
  • Autoguider:  ST-4 in faint mode
  • Sky conditions:  quite good transparency and seeing
  • Camera: Hutech modified Canon 300D
  • Exposure:  15 x 2 minutes ISO800
  • Date:  July 5, 2008
 
 
Comments:  My first night at the Ransom Rd site. It was in the upper 50s and quite humid.  M12 is nearly a twin of its apparent neighbor M10.  The linear diameter of M10 is about 68 light years.  It is approaching us at 16 km/sec.