M8 - The Lagoon Nebula

  
 
 
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  • RA: 18:03.8
  • Dec: -24:23
  • Magnitude: 6.0
  • Distance: 5,200 ly
  • Size:  90 x 40 arc min
  • Constellation:  Sagittarius
  • Scope: 8" SCT at f/10
  • Autoguider:  ST-4 in faint mode
  • Sky conditions:  average transparency and good seeing
  • Camera: Hutech modified Canon 300D ISO1600
  • Exposure:  3 x 5 minutes
  • Date:  June 20, 2007
Comments:  The Lagoon Nebula contains the cluster NGC 6530 on its east side (left in the image).  The apparent size of M8 corresponds to about 140 x 160 light years if the distance of 5,200 light years is correct. This was the last object to photograph for the night. I only had time to do three five-minute exposures before the sky was brightening. I also noticed some thin, high streamers coming in to the south and lost the guide star. Overall it was quite a productive night. I will finish M8 next month.