SH2-91

Sh2-91 constitutes the most extended southern filament of the supernova remnant G65.2+5.7, located about 2610 light years from the Solar System in a Galactic region rich in dense molecular clouds, on which lies the Great Rift. G65.2+5.7 is in fact a super bubble extended over about 587 light years and located about 261 light years north of the Galactic plane. Sh2-91 shows a strong polarization, indicating the presence of a strong magnetic field.
The entire SNR is oval in shape, and about the same size as the much better-known Veil Nebula, which is also found in the Cygnus. However, G 65.3 + 5.7 is considerably fainter than the Veil Nebula. Probably for this reason, not that many images of this region are seen……but is now perhaps becoming a more popular challenge for Narrow Band imagers with CMOS cameras.

Imaging telescope:​ Takahashi FSQ130ED
Imaging camera: ASI 2600MM
Mount: JTW Trident P75
​Guiding telescope: Takahashi FS60CB
Guiding camera: QHY 5L II M
Focal Extender / Reducer: 0.73X
Software: Sequence Generator Pro SGP (for capture) PHD 2 (guiding), Astro Pixel Processor, PixInsight.
Filters: Astrodon Ha (3nm), Astrodon OIII (3nm), Astrodon RGB.

Accessories: Robofocus Focuser controlled by Lunatico Armadillo, ATIK EFW 3, RB Focus Gaius, RB Focus Excalibur.

Dates: 18th Apr. – 27th Apr. 2025

Frames: (Total)
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Astrodon Ha 78 x 600″
Astrodon OIII 66 x 600″
Astrodon RGB 3 x 20 x 60″

Total integration = 25 Hours.