Caldwell 33 (North Up, East Left)
Caldwell 33, also known as NGC 6992, is the eastern part of the "Veil Nebula", a supernova remnant in the constellation of Cygnus.  It lies at a distance of ~1,300 light-years. The first image comprises 15 x Luminance (45 seconds each) and 6 x Red, Green and Blue (60, 60 and 48 seconds each), 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 80 degrees on 3 July 2017.  The field of view is 34’ x 23’. The second, third and fourth images comprise 5 x Ha, OIII and SII, all 300 seconds each with the  0.5m f/2.9 ASA  Astrograph with FLI ML3200 camera at an altitude of 80 degrees on 27 June 2017. The fields of view of the images are 34’ x 23’.  The first of these follows the  HST convention, with cloours mapped as follows: SII-Ha-OIII mapped to RGB.  The second shows the same frames presented using the CFHT convention, Ha-OIII-SII mapped to RGB. The final image is a monochrome composite.
Hills Observatory: 1 January 2013 to 14 August 2018
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