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Contains:  NGC 457, NGC 436, The star φCas
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NGC 436 and NGC 457 - Owl Cluster, 





    
        

            Jonathan W MacCollum
NGC 436 and NGC 457 - Owl Cluster

NGC 436 and NGC 457 - Owl Cluster

Technical card

Resolution: 4918x3267

Dates:July 14, 2019

Frames: 138x30"

Integration: 1.1 hours

Avg. Moon age: 12.49 days

Avg. Moon phase: 94.26%

Astrometry.net job: 2806045

RA center: 19.487 degrees

DEC center: 58.494 degrees

Pixel scale: 0.983 arcsec/pixel

Orientation: 182.694 degrees

Field radius: 0.806 degrees

Data source: Backyard

Description

Spent some time bouncing around a few summer-time open clusters on the only clear night available to me last week.

Enjoy, and feel free to share your thoughts and criticism. I never want to stop learning and improving!

Taken with asi071mc -> idas D1 filter -> Quattro Corrector -> Orion 8in f4.9 Reflector -> CGEM mount

Acquisition and Pre-Processing:

* Best 138 (of 150 total) x30s Lights weighted using the following subframe expression:

```(10*(1-(FWHM-FWHMMin)/(FWHMMax-FWHMMin))+ 15*(1-(Eccentricity-EccentricityMin)/(EccentricityMax-EccentricityMin))+ 25*(SNRWeight-SNRWeightMin)/(SNRWeightMax-SNRWeightMin))+ 50```

* Stacked with Linear Fit Clipping and CFA Drizzle 1x with 0.7 drop shrink

Color Calibration:

* DBE -> Background Neutralization -> Color Calibration -> Photometric Color Calibration

* Assign RGB Working space to 1,1,1

RGB Processing:

* TGV with a low contrast mask and strong edge protection

* MMT noise reduction with a high protective luminance mask

* HSV Repaired Separation Script

* Arcsinh Stretch to non-linear

Luminance Processing:

* Extract Synthetic Luminance

* Masked Stretch and Curves

Final Touches:

* LRGB Combination of L with RGB

* Additional round of DBE with a starless version using starnet++ and re-combining

* ACDNR Noise Reduction targeting the smaller scale noise

* Chrominance noise reduction on the brighter stars to eliminate grid-like structures

Comments

Author

eigenVector
Jonathan W MacCollum
License: None (All rights reserved)
891
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NGC 436 and NGC 457 - Owl Cluster, 





    
        

            Jonathan W MacCollum

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