Bubble Nebula SHO – CDK12.5 f/5.3

Bubble Nebula SHO – CDK12.5 f/5.3

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Imaging Telescopes Or Lenses : Planewave CDK12.5
Imaging Cameras : QHYCCD QHY268 M
Mounts : Astro-Physics 1100GTO
Filters : Chroma H-alpha 3nm Bandpass 50 mm · Chroma OIII 3nm Bandpass 50 mm · Chroma SII 3nm Bandpass 50 mm · baader OIII 50.4mm
Accessories : Planewave Reducer 0.66x CDK12.5-14-17
Software : Pleiades Astrophoto PixInsight · Stefan Berg Nighttime Imaging ‘N’ Astronomy (N.I.N.A. / NINA) · PHD2

Acquisition details

Dates : Sept. 2 – 4, 2021
Frames : Chroma H-alpha 3nm Bandpass 50 mm: 119×300″(9h 55′) (gain: 56.00) bin 1×1
Chroma SII 3nm Bandpass 50 mm: 74×300″(6h 10′) (gain: 56.00) bin 1×1
baader OIII 50.4mm: 78×300″(6h 30′) (gain: 56.00) bin 1×1

Integration : 22h 35′
Avg. Moon age : 25.99 days
Avg. Moon phase : 14.05%
Bortle Dark-Sky Scale : 6.00


The Bubble Nebula is an emission nebula. The “bubble” is created by the stellar wind from a massive hot young central star, The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow.

First tri-color narrowband with these 36mm 3nm Chromas. Presented here in a modified SHO palette.

Also the first fully unguided image with the AP1100GTO CP4 mount using a PE curve and no-encoders.

Average sub Eccentricity was 0.45 which I was very happy with, the stacked image was 0.39.

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