Bubble Nebula with Nova Cassiopeiae 2021 revisited

I first captured the Bubble Nebula (NGC 7635), open cluster (M52), and Nova Cassiopeiae 2021 (V1405 Cas) in April, 2021. My image showed the ability of a dual narrowband filter to cut through Austin light pollution and early morning haze and my ASIAIR Pro controlled SW AZ-EQ 5 Pro GoTo mount to find difficult targets. I've reprocess that data using my new forked workflow for nebulosity and stars and 2X drizzled stacking stacking for a much improved image.

The nova is the blinking star (solely to indicate its position) in the image below. It is linked to a full resolution image.

Twenty 3 minute exposures for a total of 60 minutes exposure with a William Optics RedCat 250/51mm refractor, Optolong L-eNhance dual band Ha and Oiii filter, ZWO ASI533MC color camera cooled to -10 degrees C. Processed with dark, flat, and bias calibration frames in PixInsight. Drizzle stacked in PixInsight for a 2x resolution increase. StarNet 2 separation of nebulosity and star layers. Both PixInsight muli-scale linear and Topaz DeNoise noise reduction. Final crop and exposure in Photoshop.

Content created: 2022-07-10

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