Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  NGC 457, NGC 436, The star φCas
Getting plate-solving status, please wait...
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% 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


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



Jonathan W MacCollum
License: None (All rights reserved)

Sky plot

Sky plot


NGC 436 and NGC 457 - Owl Cluster, 


            Jonathan W MacCollum

In these public groups

ASI 071 mcc
Cooled Color Cams