The Pacman Nebula
The Pacman Nebula, or NGC 281, is a star cluster of high-mass stars that is located about 6,500 light years from Earth.
November 7, 2024
Like my revision to the Wizard Nebula, I wanted to enhance the blues a little bit, and attempt to draw out a bit more color and detail in the little globules in the Pacman Nebula. I utilized the new DBExtract process rather than the RGB channel separation process I had used before and this resulted in a better Foraxx image in the intermediate processing phase. I also adjusted my HDRMST approach slightly, and also adjusted my approach to curves. Finally, I reduced the stars slightly compared to the last version. Like my Wizard revision, I lost a little bit of the faint nebulosity around the object compared to the first version, but it's still there. Overall, I'm pleased with the result given the improvements to the process.
Technical Details
Imaging Telescope: Orion Optics UK Ideal 8
Imaging Camera: ZWO ASI533MC Pro
Mount: Sky-Watcher EQ6-R Pro
Filter: Antlia Tri-band RGB Ultra Filter - 2” Mounted, Antlia ALP-T Dual Band 5nm 2”
Accessories: ZWO ASIAIR Plus, ZWO EAF, ZWO Filter Drawer (Gen 2)
Software: PixInsight, Starnet, BlurXterminator, NoiseXterminator
Guiding Telescope: SVBony SV106 60mm Guide Scope
Guiding Camera: ZWO ASI174MM
Imaging Dates: October 21-22, 2024
Frames (gain 101.0) f/4.9 -10c: 60×180″(3h) Triband, 280x180” (14h) ALP-T
Integration Time: 17h
Darks/Flats/Dark Flats: 60/60/60
Bortle Dark-Sky Scale: 6.00
October 24, 2024
New year, new Pacman. This time with a new scope with more resolving power, an additional new filter, and new processing tools. I bought the ALP-T filter to be able to continue capturing data even under a full moon and to help eliminate gradients from LP, as these gradients and the moonlight impact the quality of the signal I could capture with the Tri-band filter. The new ALP-T Dual Narrowband Filter gave me incredible results with 14 hours of data in skies with nearly a full moon, and i took 3 hours of data with the Triband Filter before the moon came out, primarily for star color and to capture some of the blue/green that the ALP-T eliminates. The goal was to try to experiment with combining data from the two. It took me longer than I’d care to admit to figure out the best process for doing so, but the short version is that I generally followed the method from Paulyman Astro’s video on OSC NB processing. I took the Foraxx result from that processing and used some pixelmath to combine the Foraxx image with the RGB image from the Triband data. I feel like this method gave me the best result in terms of enhancing the red and blue channels with the Ha and Oiii data from the ALP-T filter, while still keeping some of the blues and greens from the Triband filter (and of course, nicely sized and colored stars from the Triband as well!). I’m very happy with these new tools and I’m going to continue experimenting with processing in the future as I work on developing the best approach.
Technical Details
Imaging Telescope: Orion Optics UK Ideal 8
Imaging Camera: ZWO ASI533MC Pro
Mount: Sky-Watcher EQ6-R Pro
Filter: Antlia Tri-band RGB Ultra Filter - 2” Mounted, Antlia ALP-T Dual Band 5nm 2”
Accessories: ZWO ASIAIR Plus, ZWO EAF, ZWO Filter Drawer (Gen 2)
Software: PixInsight, Starnet, BlurXterminator, NoiseXterminator
Guiding Telescope: SVBony SV106 60mm Guide Scope
Guiding Camera: ZWO ASI174MM
Imaging Dates: October 21-22, 2024
Frames (gain 101.0) f/4.9 -10c: 60×180″(3h) Triband, 280x180” (14h)
Integration Time: 17h
Darks/Flats/Dark Flats: 60/60/60
Bortle Dark-Sky Scale: 6.00
January 3, 2024
Added another 3 hours of data to the pacman nebula. 1.5 hours with UV/IR Cut and 1.5 hours of Antlia Triband, in addition to my original almost 3 hours with UV/IR Cut. Also included below is a video that shows the comparison images highlighting the difference with 1.5 hours UV/IR vs 1.5 hours Antlia Triband from a Bortle 5 zone. I can certainly see there is more depth to the nebula itself, and some additional bits of nebulosity around it also appeared with the additional data.
Technical Details
Imaging Telescope: William Optics RedCat 51 II
Imaging Camera: ZWO ASI533MC Pro
Mount: Sky-Watcher EQ6-R Pro
Filter: SVBony UV/IR Cut 2”; Antlia Tri-band RGB Ultra Filter - 2” Mounted
Accessories: ZWO ASIAIR Plus, ZWO EAF, ZWO Filter Drawer (Gen 2)
Software: Siril, Photoshop, NoiseXterminator, Starnet
Guiding Telescope: William Optics UniGuide 32
Guiding Camera: ZWO ASI174MM
Imaging Dates: Nov. 10, 2023
Frames (gain 101.0) f/4.9 -10c: 88×120″(2h56m) 60x180” (3h)
Integration Time: 5h56m
Darks/Flats/Dark Flats: 90/90/90
Bortle Dark-Sky Scale: 6.00
November 30, 2023
Revisiting the data I have for the Pacman Nebula with my new technique primarily using Siril! Once again, the fainter nebulosity is better, the stars are controlled better, and I think the depth of color is also much better!
Technical Details
Imaging Telescope: William Optics RedCat 51 II
Imaging Camera: ZWO ASI533MC Pro
Mount: Sky-Watcher EQ6-R Pro
Filter: SVBony UV/IR Cut 2”
Accessories: ZWO ASIAIR Plus, ZWO EAF, ZWO Filter Drawer (Gen 2)
Software: Siril, Photoshop, NoiseXterminator, Starnet
Guiding Telescope: William Optics UniGuide 32
Guiding Camera: ZWO ASI174MM
Imaging Dates: Nov. 10, 2023
Frames: 88×120″(2h56m) (gain 101.0) f/4.9 -10c
Integration Time: 2h56m
Darks/Flats/Dark Flats: 30/30/30
Bortle Dark-Sky Scale: 6.00
November 14, 2023
My first image of the Pacman Nebula, also known as NGC 281. This time of year, the nebula is located in the eastern sky just after nightfall, and it’s not too far from the Andromeda and Triangulum galaxies. As usual since I’m just getting started, there’s a short amount of integration time (2 hours 56 mins), but I’m happy with how this image turned out so far. I would like to add some more integration time to help add details in the future.
Technical Details
Imaging Telescope: William Optics RedCat 51 II
Imaging Camera: ZWO ASI533MC Pro
Mount: Sky-Watcher EQ6-R Pro
Filter: SVBony UV/IR Cut 2”
Accessories: ZWO ASIAIR Plus, ZWO EAF, ZWO Filter Drawer (Gen 2)
Software: DSS, Siril, Photoshop, AstroFlat Pro, NoiseXterminator, StarXterminator, Astronomy Tools Actions Set
Guiding Telescope: William Optics UniGuide 32
Guiding Camera: ZWO ASI174MM
Imaging Dates: Nov. 10, 2023
Frames: 88×120″(2h56m) (gain 101.0) f/4.9 -10c
Integration Time: 2h56m
Darks/Flats/Dark Flats: 30/30/30
Bortle Dark-Sky Scale: 6.00