16  August  2016
 
   Sh2-84 Emission Nebula  
                    
 


 By     Ron Brecher
astrodoc.ca )

  Sh2-84  lies in Sagitta, the Arrow, at a distance of more than 16,000 light years. The nebula may be powered by the
bluish star just above it in this image (known as WR128), but this hasn’t been confirmed. Sh2-84 lies in a rich summer Milky
 Way star field not far from splashier objects like M27 and M71.
 The red colour of Sh2-84 comes from hydrogen atoms releasing energy as red light.
 The varied star colours indicate their temperatures: hot stars are blue and white; the coolest stars are reddish.

SBIG STL-11000M camera, Baader Ha, R, G and B filters, 10″ f/6.8 ASA astrograph, Paramount MX.  Guided with QHY5 guide camera and 80 mm f/6 Stellar-Vue refractor. 
Acquisition, guiding and mount control with TheSkyX. Focusing with FocusMax. Automation with CCDCommander. All preprocessing and post-processing in PixInsight.
Shot from my SkyShed in Guelph, Ontario. Nearly full Moon for Ha and first quarter moon for RGB. Good to excellent transparency and average to very good seeing throughout acquisition.

5x15m R, 5x15mG, 5x15mB and 25x20m Ha unbinned frames (total=12hr05m).  
 

 

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