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 5477, NGC 5473, M 101, NGC 5457
Getting plate-solving status, please wait...
M 101 LRGB, 





    
        

            Paul Muskee
M 101 LRGB

M 101 LRGB

Technical card

Resolution: 4648x3410

Dates:April 13, 2019April 14, 2019April 19, 2019April 20, 2019

Frames:
Baader B Filter - 50mm: 169x90" (gain: 1.00) -20C bin 1x1
Baader G Filter - 50mm: 85x90" (gain: 1.00) -20C bin 1x1
Baader L Filter - 50mm: 420x60" (gain: 1.00) -20C bin 1x1
Baader R Filter - 50mm: 83x90" (gain: 1.00) -20C bin 1x1

Integration: 15.4 hours

Avg. Moon age: 12.02 days

Avg. Moon phase: 81.45%

Bortle Dark-Sky Scale: 4.00

Astrometry.net job: 2664432

RA center: 210.796 degrees

DEC center: 54.349 degrees

Pixel scale: 1.142 arcsec/pixel

Orientation: 216.912 degrees

Field radius: 0.914 degrees

Locations: Lingemeer (backyard @ home), Lienden, Gelderland, Netherlands

Data source: Backyard

Description

M 101 preview taken during almost full moon.

A preview which has been quickly processed to see how good this data was. Most frames are taking during almost full moon. Nonetheless, it is looking good. However, I have some serious issues with some stars which started back in my previous image. Very annoying and gonna look for the cause of this.

Regarding imaging during full moon, I do not see why it is not possible... I only had some greens to remove but nothing special. Soon I will do a very extensive test: capture a object twice with exactly the same settings but one during (full) moon and one without moon at all. Since we do not have that many clear nights in NL I really want to investigate this...

Also have the Ha data for this object, but first I want to fix the star issue... So this will get updated anytime soon...

Comments

Author

pmuskee
Paul Muskee
License: None (All rights reserved)
1051
Like

Revisions

  • M 101 LRGB, 





    
        

            Paul Muskee
    Original
  • M 101 LRGB, 





    
        

            Paul Muskee
    B
  • Final
    M 101 LRGB, 





    
        

            Paul Muskee
    C

B

re-processed hoping that I could fix the stars... but no... will investigate further on new data sets, maybe something was wrong with this color data... I added Deconvolution to my workflow and used it on this image, the difference is subtle but very good nonetheless!

C

So I found a way to almost completely fix the issue with star colors. For that I used PixelMath with the following formula before applying a Star Mask: R/K: $T[0] G: iif(min($T[0],$T[2])>$T[1],min($T[0],$T[2]),$T[1]) B: $T[2] It is not perfect, but much better nonetheless. There will come a time where I will find the perfect solution :-).

Sky plot

Sky plot

Histogram

M 101 LRGB, 





    
        

            Paul Muskee