Sh2-91
in H-Alpha + RGB
Click on either image to see it
at 50% of the original resolution
From
Google's AI Summary: " Sh2-91, also called the Little Veil Nebula, is a
faint but expansive supernova remnant in the constellation Cygnus, near
the star Albireo. It is a small portion of the
supernova remnant
SNR G065.2+05.7, a vast, ancient, and distant structure that is larger,
further away, and older than the famous Veil Nebula. Due to its
faintness and the dense starfield it resides in,
Sh2-91 is a
challenging target for both amateur astronomers and imagers, often
requiring long exposure times and specialized filters to observe and
capture."
Image
Data:
Scope: AP155EDF
Camera: Moravian G4 (16803 ccd) w Astrodon Gen II filters
Mount: Paramount MX
Ha: 40 x 20 min; RGB 12/12/13 x 10min
Lucknow, Ontario, Canada
Aug 2025
Images acquired using TSX and CCD-Commander
Processed in PixInsight and Photoshop as follows:
PixInsight:
RGB:
Gradient Removal, SPCC, BlurX, NoiseX, Curves, HT,
StarReduction. Save
as TIFF
H-Alpha: Gradient Removal, BlurX, NoiseX, StarX, Curves, HT.
Save as TIFF
Photoshop:
RGB split into channels; Starless Ha added to Red at 100% and Blue at
20% using Lighten. Merge Channels. Some tweaks via masked ColourBalance and SelectiveColour layers. Noise reduction.
Save-for-Web
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