Sharpless 91 (Sh2-91) is a portion of the large supernova remnant (SNR), SNR 065.2+05.7. Along with Sh2-94 and Sh2-96 they are all filaments of the SNR with a diameter of about 230 light-years (70 parsecs) and an age approximately 30,000 years. It is located in Cygnus very close to the Veil Nebula but further away at 2500 light-years (Ly) as opposed to 1500 Ly for the Veil and it is four times older. Also located in this image is the small Planetary Nebula Min 1-92 (Minkowski's Footprint). In my image it looks like a tiny blue elongated star roughly in the center left of the large blue star and just below the nebula (there is a white star next to it so they almost look like they could be a double star system). I really like the blue and red intertwining filamentary structure. I also like the colorful starfield that this nebula resides in, however, it is a double edge sword as those same stars really had to be reduced in order to bring out the nebula.
So this image represents my first attempt at doing a mosaic and it was by accident (?). What happened is I thought I had my camera oriented 90 degrees from and I did not realize it until after I started - this object is much dimmer than the Veil. After I got started I decided to go with the mosaic as even if I had the camera oriented differently I still would not have captured the whole thing. The mosaic is 3-planes oriented vertically and it was really easy to set up a plan for the other two planes in N.I.N.A. as all I had to do was adjust the right ascension. I did the mosaic processing in PixInsight following YouTube instructions from Windy City Astrophotgraphy (Nick). It worked well or so I thought when I first looked, however, when I removed the stars the merging was quite apparent. The good news is it was not so bad and I was able to do a little processing gymnastics to fix it. There is another program, Microsoft Image Composite Editor, that has been getting good reports so the next time I do a mosaic I might try it instead.
So this image represents my first attempt at doing a mosaic and it was by accident (?). What happened is I thought I had my camera oriented 90 degrees from and I did not realize it until after I started - this object is much dimmer than the Veil. After I got started I decided to go with the mosaic as even if I had the camera oriented differently I still would not have captured the whole thing. The mosaic is 3-planes oriented vertically and it was really easy to set up a plan for the other two planes in N.I.N.A. as all I had to do was adjust the right ascension. I did the mosaic processing in PixInsight following YouTube instructions from Windy City Astrophotgraphy (Nick). It worked well or so I thought when I first looked, however, when I removed the stars the merging was quite apparent. The good news is it was not so bad and I was able to do a little processing gymnastics to fix it. There is another program, Microsoft Image Composite Editor, that has been getting good reports so the next time I do a mosaic I might try it instead.
Dates: 8-1-22, 8-2, 8-3, 8-5, 8-6, 8-8, 8-12, 8-14, 8-18, 8-20, 8-23, 8-26, 8-27, 8-29, 8-31, 9-1, 9-2, 9-9
Exposure:
Plane1 - Ha 51 x 300, OIII 61 x 300, R 55 x 60, G 51 x 60, B 50 x 60
Plane2 - Ha 53 x 300, OIII 46 x 300, R 39 x 60, G 41 x 60, B 40 x 60
Plane3 - Ha 49 x 300, OIII 68 x 300, R 32 x 60, G 37 x 60, B 37 x 60
Dates: 8-1-22, 8-2, 8-3, 8-5, 8-6, 8-8, 8-12, 8-14, 8-18, 8-20, 8-23, 8-26, 8-27, 8-29, 8-31, 9-1, 9-2, 9-9
Camera: ZWO ASI1600MM-Pro
Telescope: Astro-Tech AT115EDT 115mm Refractor Telescope
Barlow: None
Focal Length: 805mm (644mm w/ FR)
f/7
Focal Reducer: 0.8x AstroTech Field Flatterner/Focal Reducer
Mount: Orion Sirius
Filter Wheel: ZWO EFW 8 x 1.25"
Filter: ZWO Ha, OIII, R, G, B
Focuser: ZWO EAF
Autoguiding: ASI120 Mini attached to an Agena 50mm Guide Scope/ZWO 60mm Guidescope
Exposure:
Plane1 - Ha 51 x 300, OIII 61 x 300, R 55 x 60, G 51 x 60, B 50 x 60
Plane2 - Ha 53 x 300, OIII 46 x 300, R 39 x 60, G 41 x 60, B 40 x 60
Plane3 - Ha 49 x 300, OIII 68 x 300, R 32 x 60, G 37 x 60, B 37 x 60
Gain: 139
Offset 20
Sensor Temp: 0 C
Processing: NINA, PixInsight, Photoshop, Topaz DeNoiseAI, StarXTerminator.
https://www.instagram.com/astroquest1/
http://astroquest1.blogspot.com/
https://www.astrobin.com/users/kurtzepp/collections/
http://youtube.com/c/AstroQuest1
Offset 20
Sensor Temp: 0 C
Processing: NINA, PixInsight, Photoshop, Topaz DeNoiseAI, StarXTerminator.
https://www.instagram.com/astroquest1/
http://astroquest1.blogspot.com/
https://www.astrobin.com/users/kurtzepp/collections/
http://youtube.com/c/AstroQuest1
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