Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's nebulae  ·  M 81  ·  M 82  ·  NGC 3031  ·  NGC 3034
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M81/M82 - From a Bortle 8, jeff2011
M81/M82 - From a Bortle 8
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M81/M82 - From a Bortle 8

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M81/M82 - From a Bortle 8, jeff2011
M81/M82 - From a Bortle 8
Powered byPixInsight

M81/M82 - From a Bortle 8

Equipment

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Acquisition details

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Description

This was my first data processed in PI back in 2015. Thought I would give it a reprocess redo to see if I could blend in the Ha data better. I followed Warren Keller's book Inside Pixinsight example to do this using the NBRGBCombination script. I also used other processes PI processes that I did not use in my original process such as mure denoise, local normalization, photometric color calibration, HSV Repair, arcsin stretch, and masked stretch. I also rejected more subs in the subframe selection process.

My original process from 2015 can be found here

https://flic.kr/p/rxKmR4

This target was imaged through some of my worst light pollution to my north. Only the east is worse.

For this version my filter break down is as follows

Lum - 303 x 120"

Red - 46 X 300"

Green - 31 X 300"

Blue - 42 x 300"

Ha - 9 x 1800"

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Sky plot

Sky plot

Histogram

M81/M82 - From a Bortle 8, jeff2011