Monday, November 24, 2025
Soap Bubble Nebula, Ju 1
This beautiful and symmetric planetary nebula drifts in the constellation Cygnus at a distance of about 4,000 light-years from us.
Ju 1 (PN G075.5+01.7) was discovered in 2007 by amateur astronomer Dave Jurasevich.
With an angular diameter of about 260 arcseconds, the nebula is extremely faint, and its position against a backdrop of diffuse emission made it particularly difficult to detect.
My image of this planetary nebula has a total exposure time of 35 hours — 30 hours in O III and 5 hours in H-alpha — captured over several nights between 20 October and 17 November 2025.
Soap Bubble Nebula
Click for a large image, 1600x1900 pixels
The emission from H-alpha is seen as red, blueish tones are from an emission of ionized oxygen, O-III. This combination is very close to a visual colors of the nebula.
Soap Bubble up close and personal
Click for a large image, 1700x1700 pixels
Soap Bubble in O-III emission only
Click for a large image, 1600x1900 pixels
Technical details
Processing workflow
Image acquisition, MaximDL v6.5
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 27 iterations, added at 50% weight
Color combine in PS
Levels and curves in PS
Imaging optics,
Celestron EDGE 14" with 0.7 Focal reducer
Mount,
MesuMount Mark II
Cameras,
Imaging camera Apogee Alta U9000M and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and SXV-AO Active Optics @ 5hz
filters,
Astrodon 5nm H-alpha and 3nm O-III
Total exposure time 30h
H-alpha, 15 x 1200 s, binned 1x1 = 5 h
O-III, 90 x 1200 s, binned 1x1 = 30 h
O-III, 90 x 1200 s, binned 1x1 = 30 h
Calibrated 1200s Raw-images of H-alpha and O-III
Exposures are calibrated with bias corrected flat frames and unliterary stretched to be visible
Single H-alpha Frame of 20 min exposure.
Single O-III Frame of 20 min exposure
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