NGC 7635 - Bubble Nebula (2024)

This is my latest image of NGC 7635 or the Bubble Nebula (a.k.a. Sh2-162). NGC 7635 is being pushed out by the stellar wind of a massive star, SAO 20575, within 'the bubble'. Located approximately 7,100 light-years away in Cassiopeia, NGC 7635 is situated in a giant molecular cloud which is able to contain the expansion of the bubble gas. The glow results from the gas getting ionized by the hot radiation from the central star. The Bubble is about 10 light-years across.

Other Deep Sky Objects (DSOs) found in this field include LBN 548/549 - the bright red area around the Bubble, LDN 1231 - a dark nebula up and left of the Bubble, Sh2-161 - LBN 547 - the large faint red Ha region on the left, PN G112.5-00.1 - a planetary nebula below and right of the Bubble, and one of my favorite area LBN 544 - a bright blue and red Ha region with a fair amount of oxygen on the upper right portion of the image.

Capturing went pretty smoothly except for one night when I thought I was centered on the object but was way off. I finally figured out how to have N.I.N.A. check the centering every so often, courtesy of Pat Prokop (https://www.youtube.com/watch?v=sc-Vtv1XzxQ&t=1876s), in case clouds or space aliens get in the way. Processing also went smoothly. As usual there is a lot of subjective coloring with SHO objects which I struggle with. However, for this object I went with what was most pleasing to me and also what other people liked on Astrobin.

Pat's Channel (www.youtube.com/@HeavenlyBackyardAstronomy)

Dates: 7-7-24, 7-11, 7-13, 7-14, 7-18, 7-19, 7-29

High Quality:
https://www.astrobin.com/g3o7ew/?nc=collection&nce=712

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https://www.astrobin.com/users/kurtzepp/collections/
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NGC 7635 - Bubble Nebula (2024) 
Dates: 7-7-24, 7-11, 7-13, 7-14, 7-18, 7-19, 7-29
Camera: ZWO ASI1600MM-Pro
Telescope: Astro-Tech AT115EDT 115mm Refractor Telescope
Barlow: None
Focal Length: 805mm (644mm w/ FR)
f/7
Focal Reducer: 0.8x AstroTech Field Flatterner/Focal Reducer
Mount: Orion Sirius
Filter Wheel: ZWO
EFW 8 x 1.25"
Filter: Antlia Ha, OIII, SII; ZWO R, G, B
Focuser: ZWO EAF
Autoguiding: ASI120 Mini attached to an Agena 50mm Guide Scope/ZWO 60mm Guidescope
Exposure: Ha 75 x 300, OIII 73 x 300, SII 68 x 300, R 46 x 90, G 47 x 90, B 44 x 90 (Total 21h 25')

Gain: 139
Offset 20
Sensor Temp: 0 C
Processing: NINA, PixInsight, Photoshop, BlurXTerminator, StarXTerminator, NoiseXTerminator, GraXpert, Bill Blanshan Color Masks, Bill Blanshan Stretching.