The Crescent Nebula (NGC 6888)

Posted by Igor FP
on Saturday, May 02, 2009

by Igor Chekalin

 

   Image was taken during March/April 2009. 13 observing nights. 9 hours in H-alpha (Astrodon 6nm), 10 and 20 min subexpositions. 10 hours in O-III (Baader 8nm), 20min subexpositions. 34x2min unfiltered RGB for color stars field and "pseudo-continuum" substraction.
   Equipment: Canon 350Da(baader filter mod), Newton, 254/1200mm. EQ6PRO SynScan mount, auto-guided.
   Light-polluted, urban sky. About 4.0m visual limit.

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