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04-October-2006, 03:44 AM
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NGC 6888 The Crescent Nebula in Cygnus
Hi ALL,
Here is my first crack at this object, taken last Sunday Night.....it barely fit in the ST9's 19.2 arc min field of view, especially since I usually dither my field of view a few pixels each image....to help with calibrating the images later, less noise, much cleaner image results. Homemade 16" F4.5 Newt. Fork Mount, ST9CCD, 40 Minutes H-Alpha, 10 Minutes each LRGB, Maxim , CCDstack, Adobe PS, . NGC 6888 The Crescent Nebula in Cygnus, is this really an Emission Nebula or (SNR) Supernova remnant? It sure looks like an SNR,...but some sources I checked have it as a nebula.
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Best Regards, John Chumack The Chumack Observatories MPC 838 Dayton Research Station MPC H66 Yellow Springs Research Station www.galacticimages.com 
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04-October-2006, 06:12 PM
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I like the detail that the Ha provides. I have found that you need lots of exposure time with Ha -- Hours -- to get really good results. Tracking is always an issue.
Nice work in any case.
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