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:  Bode's nebulae, M 81, M 82, NGC 3031, NGC 3034
Getting plate-solving status, please wait...
M81 and M82, 


            Chris Sullivan
M81 and M82
Powered byPixInsight

M81 and M82

Technical card

Dates:Jan. 6, 2019Jan. 31, 2019Feb. 1, 2019Feb. 10, 2019March 5, 2019March 7, 2019March 12, 2019March 17, 2019March 18, 2019March 20, 2019March 24, 2019

Blue: 110x150" (gain: 139.00)
Green: 106x150" (gain: 139.00)
ZWO H-alpha 7nm: 147x300" (gain: 139.00)
Baader IR-Cut Moon & Skyglow Neodymium: 271x150" (gain: 139.00)
Red: 97x150" (gain: 139.00)

Integration: 36.6 hours

Avg. Moon age: 13.40 days

Avg. Moon phase: 40.16%

Bortle Dark-Sky Scale: 7.50

Basic astrometry details job: 3244842

RA center: 9h 56' 0"

DEC center: +69° 18' 36"

Pixel scale: 0.912 arcsec/pixel

Orientation: 88.474 degrees

Field radius: 0.705 degrees

Resolution: 4517x3255

Locations: Home Roof (Bortle 7-8 / Est. Sky Quality: 18.53), Springfield, PA, United States

Data source: Backyard


Processing this one was absolutely brutal. I’ve been sitting on these data for over a month because my first two attempts looked absolutely terrible. I just couldn’t get the colors to work at all. I finally gave it another shot last Friday and I’ve been working on it ever since. For the purists: You should know I masked and pasted the crap out of this because once I finally got the stars, background and M82 to look nice, M81 looked downright ugly. So I tried just processing M81 and once I got it looking how I wanted, M82 had been completely destroyed. I definitely feel like this is my most ‘overprocessed’ image, and I still managed to blow out the core of M81. Special thanks to Jeremy Scheere, Cameron Jack, Samara Nagle, Brian Fulda, Jarrett Trezzo and Elie Kheirallah for input on this one!

FYI: Despite the integration time, there was no trace of IFN even in my superlum stack. Bortle 7-8 skies are apparently just too bright to capture it.



Chris Sullivan
License: None (All rights reserved)

Sky plot

Sky plot


M81 and M82, 


            Chris Sullivan