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Contains:  IC 1795, NGC 896
Getting plate-solving status, please wait...
Fish Head Nebula (NGC 896) in Narrowband, 


            Frank Kane
Fish Head Nebula (NGC 896) in Narrowband
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Fish Head Nebula (NGC 896) in Narrowband

Technical card

Dates:Nov. 20, 2019

Frames: 111x600"

Integration: 18.5 hours

Avg. Moon age: 22.82 days

Avg. Moon phase: 42.92%

Basic astrometry details job: 3068024

RA center: 2h 27' 47"

DEC center: +62° 1' 12"

Pixel scale: 1.114 arcsec/pixel

Orientation: 175.474 degrees

Field radius: 0.532 degrees

Resolution: 2213x2627

Data source: Backyard


One of my longest exposures and toughest processing challenges - replacing the magenta SHO stars in this image with RGB stars was really tricky. I ended up using StarNet to create a star-less version, and then used a complex PixelMath expression to blend the star-less narrowband image with the RGB image using a star mask, selecting the most luminous pixel from the NB or RGB images within the mask - using luminance channels extracted from each. Phew.

This is also my first time using the new WeightedBatchPreProcessing script for PixInsight, which is amazing.



Frank Kane
License: None (All rights reserved)

Sky plot

Sky plot


Fish Head Nebula (NGC 896) in Narrowband, 


            Frank Kane