NGC7635 - The Bubble Nebula - A narrowband image in the Hubble Palette. Also known as Sharpless 162 and Caldwell 11. The Bubble Nebula can be found in the constellation Cassiopeia, not far from the Open Cluster Messier 52. This area is a rich HII region and the bubble itself was created by stellar winds from a massive hot blue Wolf-Rayet star, AO 20575, that shed its material about 300,000 years ago to form the bubble. This star is 44 times larger than our sun. The Bubble itself is found in a massive molecular cloud which contains the expansion of the bubble and is excited by the same star, causing it to glow as well.

This image is the result of 25x5min exposures through Ha, O3 and S2 narrowband filters - for a total integration of about 6.25 hours. This was taken over two nights in the past week when a cold Canadian airmass pushed the smoke plume from the fires out west down south of us. I would like to get more integration but I only have access to it for a few hours as it rises above my tree line and before it sets behind another set of trees.

Here are the details for this image:

25 x 500 seconds, bin 1x1 @ -15C, unity gain, ZWO Gen II Ha Filter

25 x 500 seconds, bin 1x1 @ -15C, unity gain, ZWO Gen II O3 Filter

25 x 500 seconds, bin 1x1 @ -15C,unity gain, ZWO Gen II S2 Filter

50 Bias exposures

25x500 seconds Dark exposures

50 Ha Flats

50 O3 Flats

50 S2 Flats

Scope: Astrophysics 130mm Starfire F/8.35 APO refractor

Guide Scope: Televue 76mm Doublet

Camera: ZWO ASI1600mm-pro with ZWO Filter wheel with ZWO filter set

Guide Camera: ZWO ASI290Mini

Focus Motor: Pegasus Astro Focus Cube 2

Camera Rotator: Pegasus Astro Falcon

Mount: Ioptron CEM60

Polar Alignment: Polemaster camera

Capture Software: PHD2 Guider, Sequence Generator Pro controller

Image Processing: Pixinsight, Photoshop, along with Coffee, extensive processing indecision and second guessing, frequent processor's regret, significant frustration and the occasional swear word...…..