Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5457  ·  NGC 5473  ·  NGC 5477
M 101 : the Pinwheel properly exposed !, 



    
        

            Ewam
M 101 : the Pinwheel properly exposed !
Powered byPixInsight

M 101 : the Pinwheel properly exposed !

Acquisition details

Dates:
March 23, 2015
Frames:
37×160(1h 38′ 40″)
Integration:
1h 38′ 40″
Avg. Moon age:
3.51 days
Avg. Moon phase:
13.31%

Basic astrometry details

Astrometry.net job: 582096

RA center: 14h03m27s.6

DEC center: +54°2801

Orientation: -80.178 degrees

Field radius: 0.615 degrees

Resolution: 620x430

File size: 181.3 KB

Locations: La Gueule du Loup (Malonne), Namur, Namur, Belgium

Description

> VERSION E : minor corrections on the star colors (purple halo removed, little saturation) and under processed on the galaxy : more "natural" ? Hmm

> VERSION D : I wasn't happy with color balance (to much search into selective colors...) and excess contrast in StarTools, so I went back into PixInsight... This framing renders a "visual like" view of the galaxy. More (well chosen) subs should enhance the definition.

----TECH SPEC : 29 x 122sec @ 2000iso + 8 UHC x 300sec @ 3200iso

OK, I still feel I need to progress on both acquisition - more subs on one target (I did Rosette AND M101 the same night, out under the sky, without any automated process, Brrr), than on the all important editing trial & error routine. But this is quite pleasant to see some improvements here and there.

So at last, I found a proper exposure and iso setting for this galaxy above my belgium sky :

> VERSION A is a plain (broadband) 29x 122 second subs stacked and processed ;

> VERSION B is a version with added UHC subs : an extra 8x 300". The framing moved in the process of screwing on the UHC filter, so You can see a lighter frame all around...

> VERSION C : revisiting StarTools with some nice surprises - "live", gradient reduction, HDR core extraction, a user-friendly noise reduction, ... bunch of nice detailed gained in this one !

> Next shall come Ha subs...

Comments

Revisions

  • M 101 : the Pinwheel properly exposed !, 



    
        

            Ewam
    Original
  • M 101 : the Pinwheel properly exposed !, 



    
        

            Ewam
    B
  • M 101 : the Pinwheel properly exposed !, 



    
        

            Ewam
    C
  • M 101 : the Pinwheel properly exposed !, 



    
        

            Ewam
    D
  • Final
    M 101 : the Pinwheel properly exposed !, 



    
        

            Ewam
    E

Sky plot

Sky plot

Histogram

M 101 : the Pinwheel properly exposed !, 



    
        

            Ewam