SH2-91: Over the nights of the 14th to the 16th August I shot a 2 pane mosaic of this ancient supernova remnant in the constellation of Cygnus using both RGB and SHO filters. As the majority of this target glows in narrowband, just one hour per panel of RGB data was used to capture the dense star cloud region of the Milky Way in which the supernova remnant lies. Around 6 hours per panel of SHO data was taken to reveal the various shells of gases left over from the death of this long gone star which glow particularly brightly in OIII as vibrant blue tendrils. The various data sets were integrated and processed separately in Pixinsight, but due to insufficient overlap between panels resulting in bad gradients when combined in the linear state, each panel was processed to a non-linear state separately and then stretched to similar levels before producing the final mosaics. A starless version was produced using StarXTerminator and two versions containing stars were made with both SHO and RGB stars respectively. The full RGB/SHO data comprises some 13.7 hours total exposure time. A mosaic from an interim edit of the 15th August was annotated within Pixinsight to show the numerous other fainter galaxies contained in this image that spans some 2.6 x 1.25 degrees of sky. All data were acquired in NINA using an ASI 533MM pro camera and EFW attached to a Sky-Watcher Esprit 80mm triplet refractor fitted with a focal reducer.
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SH2-91 SHO all data
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