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Imaging telescopes or lenses: Orion 203/1000 f/4.9
Imaging cameras: ZWO ASI183MM-pro
Mounts: Celestron CGEM
Guiding telescopes or lenses: ZWO OAG
Guiding cameras: ZWO ASI120MM
Software: PixInsight PinInsight 1.8.5 · Isbeorn N.I.N.A. · PHD 2
Filters: Astrodon LRGB Tru-Balance I-Series Gen B · Astrodon LRGB Tru-Balance I-Series Gen G · Astrodon LRGB Tru-Balance I-Series Gen R · Astrodon LRGB Tru-Balance I-Series Gen L
Accessory: Skywatcher 2" Coma Corrector f/4 · ZWO EFW 8 EFW 8x1.25" filter wheel
Astrodon LRGB Tru-Balance I-Series Gen B: 73x120" (gain: 111.00) -15C
Astrodon LRGB Tru-Balance I-Series Gen G: 69x120" (gain: 111.00) -15C
Astrodon LRGB Tru-Balance I-Series Gen L: 300x120" (gain: 111.00) -15C
Astrodon LRGB Tru-Balance I-Series Gen L: 26x240" (gain: 111.00) -15C
Astrodon LRGB Tru-Balance I-Series Gen R: 80x120" (gain: 111.00) -15C bin 1x1
Integration: 19.1 hours
Flat darks: ~15
Bortle Dark-Sky Scale: 4.00
Astrometry.net job: 3318340
RA center: 4h 4' 23"
DEC center: +26° 19' 37"
Pixel scale: 0.498 arcsec/pixel
Orientation: 86.204 degrees
Field radius: 0.422 degrees
Data source: Backyard
LBN777 - The Happy lil' Ghost Nebula
I first came across this target when imaging the dusty region between the Taurus Dark Molecular Cloud and the Pleiades with my 135mm camera lens in early 2019. I immediately saw what looked like a hybrid of the "Pacman" character of the late arcade game and one of the ghost within the game. To me it looks like a ghost-like pacman lurching forward mouth-open to consume that bright shiny yellow star. I have yet to process that widefield image to my satisfaction, but set a goal for myself late this season to try and capture it with my 8in Newt. Despite the large amount of integration time, I felt that it still just isn't enough to do it justice. There were after a number of false starts processing this data, but nontheless was a pleasure to work on this data seeing all of the wisps of dust in the lower right corner, and the small yet prominant galaxies throughout the field. The brightest star has what appeared to be some sort of reflection or halo going on, but turns out this is a real structure as it shows up in almost all images I've been able to find of this target. But here it is, I have finally reached a version I am fairly happy with and hope you do too. Constructive Criticism is highly encouraged as I hope to continue to improve my processing abilities. I have also acquired more widefield data of this region, and it's on my processing check-list. Perhaps with the recent decrees to "stay home" as people are reacting to the outbreak of COVID-19 I'll finally get to put a dent into my processing backlog.
Orion 8in F4.9 1000mm Newtonian Reflector
Flocked / Primary mirror replaced due to turned-down-edge
Skywatcher F4 Aplanatic Coma Corrector
Astrodon I Series L, R, G, B broadband filters
ASI183mm Pro cooled to -15C
Celestron CGEM Mount
Self tuned / hacks to get guiding stable include:
Intentional offset polar alignment so dec always pulses in one direction
Balance "west" heavy (rather than the recommended east) so that the ota "falls" onto the gear teeth rather than get "lifted"
Factor Reset hand-controller daily (to prevent cgem from being possessed and forgetting where the meridian is on subsequent night)
Dither in RA only
Images captured using N.I.N.A
Red: 80x2min (+8 rejected)
Green: 69x2min (+17 rejected)
Blue: 73x2min (+11 rejected)
Lum: 300x2min (+57 rejected)
Lum: 26x4min (none rejected)
Total Integration Time: 19 hours 08 minutes
Imaging Dates: Data Captured over 9 Nights in late November and December 2019
2019-11-01 2019-11-02 2019-11-03
2019-11-20 2019-11-24 2019-11-25
2019-12-24 2019-12-25 2019-12-30
The resulting image is a combination of the following steps:
Inspected all 610 subs for bad images with Blink after each session, discarding those with clouds, or trailing stars from poor stars.
Calibrated all subs with their corresponding master flat and master dark
Used subframe selector to weight all remaining subs together using the following formula:
Selected the best sub from subframe and blink to use as a reference frame in stacking
Created a super luminance by integrating all remaining 548 frames together
Integrated all Red frames together, Blue frames together and Green frames together to create masters for each color
Cropped the stacking edges of the integrated masters
Combined the Red, Green and Blue masters to create a color RGB image
Automatic Background Extractor
Function degree 1 with normalization
Independently produce a noise reduced image and a sharpened image
Two rounds of Noise Reduction was done using TGV Denoise with a low contrast mask and an autostretched local support (First round with very strong edge protection, second round with very weak edge protection but very small strength)
Deconvolution was done on a separate copy of the luminance with
wavelet regularization with 5 layers and strong but reducing amounts/thresholds
The noise reduced copy and the sharpened copy were combined using a luminance-based mask where the high-signal areas were filled in from the deconvolution copy and the low-signal areas were filled in from the noise reduction copy:
Masked Stretch was used with no clipping and a background reference created from 4 preview windows and the Preview Aggregator script. Histogram Transformation was used to bring the tail of the blacks in without clipping and perform additional lifting of the nebulosity..
Local Histogram Equalization was used to enhance the larger structures
The overall impact of the stars were reduced and star cores were shaped with two rounds of Morphological Transformation and a contours based mask created by subtracting the resulting image from an expanded starmask.
Automatic Background Extractor
Function degree 1 with normalization
Background Neutralization using 5 preview windows and the Preview Aggregator script as the background reference
Color Calibration using Photometric Color Calibration using the Average Spiral Galaxy as the white reference
Noise Reduction using TGV Denoise with a low contrast mask and an autostretched local support targetting luminance and chrominance
Noise Reduction using MMT with a very protective luminance mask targetting luminance and chrominance
Repair the saturated star cores with the HSV Repaired Separation script
Arcsinh Stretch and Histogram Stretch to bring to non-linear
SCNR Green on the background with a luminance mask
Additional curves transformation to increase overall color saturation
The super luminance and the RGB image were then combined using the Channel Combination tool in CIE L*A*B mode to apply the Super Luminance to the RGB image
Curves Transformation to increase contrast and colors throughout the field
Final round of noise reduction with MLT to target the remaining small scale chrominance noise
ICC Color Profile was added and the image saved as PNG for viewing on the internet
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