
IC 1396 - Elephant Trunk Nebula
The Elephant's Trunk Nebula is cloud of gas and dust within a larger ionized gas region (IC 1396) that is located in the constellation Cepheus, about 2,400 light years away from Earth. The bright rim around the Elephant Trunk is being illuminated and ionized by a very bright, massive star just to the east. Infrared imaging has shown the Elephant Trunk Nebula to be a site of star formation, though two older stars have carved out a circular cavity in the head of the globule.
August 7, 2025
I was recently fortunate enough to acquire a Hyperstar for my C9.25. After what feels like several months of uncooperative weather (it's really only been a month... but it was another month prior to that!), I was finally able to get the scope out under the stars. the forecase initially called for some clouds overnight, so I initially set out to do the less fun initial setup items; like getting everything initially in focus, collimated, and overall checking to make sure it all works, but as I worked through those bits, the forecast shifted to being mostly clear, and I decided to let the scope run for the night! I must say, after imaging at f/6.3 for awhile, imaging at f/2 at 540mm was absolutely delightful! I was able to capture so much more subtle detail with the same exposure length. Furthermore, I culled fewer frames due to poor guiding from wind gusts, though I still eliminated about an hour's worth of subframes due to some Saturn shaped stars. That being the case, my next task is the same as it has been the last couple times out: focus on creating a pop-up windbreak that I can set out with the scope, since it seems like a pier and/or observatory isn't a viable solution at this time.
Technical Details
Imaging Telescope: Celestron C9.25 XLT
Imaging Camera: ZWO ASI533MC Pro
Mount: Sky-Watcher EQ6-R Pro
Filter: Antlia Tri-band RGB Ultra Filter - 2” Mounted
Accessories: Starizona Filter Drawer 2", Starizona HyperStar 9.25 v4, ZWO ASIAIR Plus, ZWO EAF
Software: StarNet, PixInsight, BlurXTerminator, NoiseXTerminator, SetiAstro Statistical Stretch, SetiAstro Star Stretch, Siril, ZWO ASIAIR
Guiding Telescope: SVBony SV106 60mm Guide Scope
Guiding Camera: ZWO ASI174MM
Imaging Dates: August 6, 2025
Frames (gain 101.0) f/4.9 -10c: 80x180” (4h)
Integration Time: 4h
Darks/Flats/Dark Flats: 30/30/30
Bortle Dark-Sky Scale: 6.00
August 7, 2025
Completely reprocessed in Pixinsight.
Technical Details
Imaging Telescope: William Optics RedCat 51 II
Imaging Camera: ZWO ASI533MC Pro
Mount: Sky-Watcher EQ6-R Pro
Filter: Antlia Tri-band RGB Ultra Filter - 2” Mounted
Accessories: ZWO ASIAIR Plus, ZWO EAF, ZWO Filter Drawer (Gen 2)
Software: StarNet, PixInsight, BlurXTerminator, NoiseXTerminator, SetiAstro Statistical Stretch, SetiAstro Star Stretch, Siril, ZWO ASIAIR
Guiding Telescope: William Optics UniGuide 32
Guiding Camera: ZWO ASI174MM
Imaging Dates: July 29, 2024
Frames (gain 101.0) f/4.9 -10c: 100x180” (5h)
Integration Time: 5h
Darks/Flats/Dark Flats: 30/25/30
Bortle Dark-Sky Scale: 6.00
July 30, 2024
The galactic plane is returning to a position in the sky where I can once again start imaging larger areas of nebulosity! The Elephant Trunk is a popular object for astrophotographers due to its unique shape and size in the sky. I feel like the color balance is a little green-tinted, but based on other images I’ve seen, that may just be the way this object is!
Technical Details
Imaging Telescope: William Optics RedCat 51 II
Imaging Camera: ZWO ASI533MC Pro
Mount: Sky-Watcher EQ6-R Pro
Filter: Antlia Tri-band RGB Ultra Filter - 2” Mounted
Accessories: ZWO ASIAIR Plus, ZWO EAF, ZWO Filter Drawer (Gen 2)
Software: Siril, Starnet, Photoshop, NoiseXterminator, APF-R
Guiding Telescope: William Optics UniGuide 32
Guiding Camera: ZWO ASI174MM
Imaging Dates: July 29, 2024
Frames (gain 101.0) f/4.9 -10c: 100x180” (5h)
Integration Time: 5h
Darks/Flats/Dark Flats: 30/25/30
Bortle Dark-Sky Scale: 6.00