Note: click on the image to view it at the full resolution of the uploaded image, then click again for actual size.

A total of 6.67 hours exposure (11 x 20 min subs).

Exposure	11@1200 sec
Gain	100
Camera	ATR2600C [6224 x 4168]
Optics	Skywatcher Esprit 120mm Refractor
Filter	Radian Triad Ultra Quad-Band Narrowband Filter
Guiding	Phd2 using a ToupTek GPM462M on an 60x400mm Guide scope
Controller	Kstars on MeLe Quieter 4C running Ubuntu 24.04
Location	Lower Sackville, Nova Scotia.
Date	2025-09-12
PixInsight Processing	WeightedBatchPreprocessing Script BlurXTerminator GraxPert background removal NoiseEXterminator StarXTerminator HistogramTransform Generalized Hyperbolic Stretch

Date: September 13, 2025 ]]> https://sciencedowneast.com/zenphoto/index.php?album=Nebulae/Crescent-Nebula&image=Crescent-soapbubble_v2.jpg Sat, 13 Sep 2025 11:14:35 -0300 https://sciencedowneast.com/zenphoto/index.php?album=Nebulae/Crescent-Nebula&image=masterLight_BIN-1_8256x5504_EXPOSURE-1200.00s_FILTER-LPR_combined_RGB_-3-a-SharpenAI-Focus.jpg

This differs from the original version in the image processing steps only.

A total of 6.67 hours exposure.

Exposure	20@1200 sec
ISO	3200
Camera	Nikon Z7 [8856 x 5504]
Optics	Skywatcher Esprit 120mm Refractor
Filter	Radian Triad Ultra Quad-Band Narrowband Filter
Guiding	Phd2 using a ZWO 224MC on an Orion 60x240mm Guide scope
Controller	Images taken using Kstars on an Odroid-N2 (Raspberry Pi clone)
Field of View	2.08 x 1.37 deg
Location	Lower Sackville, Nova Scotia.
Date	2022-07 - 2022-08-06
PixInsight Processing	WeightedBatchPreprocessing Script HistogramTransform NoiseXTerminator noise reduction StarXTerminator starless image produced CurvesTransformation Enhanced the Red channel in the starless image Recombined stars and starless image with PixelMath
Sharpened in Topaz Sharpen AI

Thanks for the feedback/suggestions Blair!
Date: March 26, 2025 ]]> https://sciencedowneast.com/zenphoto/index.php?album=Nebulae/Crescent-Nebula&image=masterLight_BIN-1_8256x5504_EXPOSURE-1200.00s_FILTER-LPR_combined_RGB_-3-a-SharpenAI-Focus.jpg Mon, 08 Aug 2022 13:29:39 -0300 https://sciencedowneast.com/zenphoto/index.php?album=Nebulae/Crescent-Nebula&image=masterLight_BIN-1_8256x5504_EXPOSURE-1200.00s_FILTER-LPR_combined_RGB_-3-_ST.jpg The Crescent Nebula NGC 6888 is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. he Elephant Trunk Nebula IC 1386 is a concentration of interstellar gas and dust within the much larger ionized gas region in the constellation Cepheus about 2,400 light years away. The bright rim is the surface of the dense cloud that is being illuminated and ionized by a very bright, massive star (HD 206267) that is just above the Trunk in this image.

A total of 6.67 hours exposure.

Exposure	20@1200 sec
ISO	3200
Camera	Nikon Z7 [8856 x 5504]
Optics	Skywatcher Esprit 120mm Refractor
Filter	Radian Triad Ultra Quad-Band Narrowband Filter
Guiding	Phd2 using a ZWO 224MC on an Orion 60x240mm Guide scope
Controller	Images taken using Kstars on an Odroid-N2 (Raspberry Pi clone)
Field of View	2.08 x 1.37 deg
Location	Lower Sackville, Nova Scotia.
Date	2022-07 - 2022-08-06
PixInsight Processing	WeightedBatchPreprocessing Script HistogramTransform CurvesTransformation
Further tweaking (or destruction) for colour in Lightroom

Date: March 26, 2025 ]]> https://sciencedowneast.com/zenphoto/index.php?album=Nebulae/Crescent-Nebula&image=masterLight_BIN-1_8256x5504_EXPOSURE-1200.00s_FILTER-LPR_combined_RGB_-3-_ST.jpg Sun, 07 Aug 2022 13:58:03 -0300