Hemisphere:  Northern
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Soap Bubble in Cygnus, 


Soap Bubble in Cygnus
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Soap Bubble in Cygnus

Technical card

Imaging telescopes or lenses: Celestron c14 EdgeHD Celestron C14

Imaging cameras: SBIG ST-10XME

Mounts: Astro-Physics 900 GTO

Focal reducers: Celestron Reducer 0.7x

Filters: Astrodon 3nm OIII  ·  Ha 5nm  ·  Astrodon I-series

Dates:Aug. 11, 2019Aug. 15, 2019Aug. 17, 2019

Astrodon 3nm OIII: 75x900" bin 1x1
Astrodon I-series: 61x12" bin 2x2
Ha 5nm: 130x900" bin 1x1

Integration: 51.5 hours

Avg. Moon age: 14.13 days

Avg. Moon phase: 93.95%

Basic astrometry details

Astrometry.net job: 2932464

RA center: 20h 15' 40"

DEC center: +38° 2' 34"

Pixel scale: 0.512 arcsec/pixel

Orientation: 18.428 degrees

Field radius: 0.161 degrees

Resolution: 1859x1284

Data source: Backyard


The Soap Bubble in Cygnus turned out to be a tough customer. Even with the focal reducer bringing my C14 down to about f/7.7, the bubble is barely visible on stretched 15 minute sub-exposures in Ha and OIII. The plus side is that the final image revealed the variability in thickness, color, and fringing of the bubble's outline.

I hope you like it!




Sky plot

Sky plot


Soap Bubble in Cygnus,