Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5457  ·  NGC 5473  ·  NGC 5474  ·  NGC 5477
M101 - a Pinwheel in 5 subs, 



    
        

            Ewam
M101 - a Pinwheel in 5 subs
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M101 - a Pinwheel in 5 subs

Equipment

Acquisition details

Dates:
July 14, 2015
Frames:
34×120(1h 8′)
Integration:
1h 8′
Avg. Moon age:
28.00 days
Avg. Moon phase:
2.62%

Basic astrometry details

Astrometry.net job: 783377

RA center: 14h03m15s.8

DEC center: +54°1818

Orientation: -85.129 degrees

Field radius: 0.811 degrees

Resolution: 620x388

File size: 161.5 KB

Locations: Le Terme, Peyzac-le-Moustier, Dordogne, France

Description

In april I caught 29 subs of M101 : 120 sec @ 2000 iso under a less than perfect Belgium sky.

In south of France I wanted to improve this work but as it wasn't a priority in my shopping list, I only gave it a try with 1 x 120 + 4 x 150 sec @ 3200 iso. I used 65% of these with 35% of the old session in order to reduce noise especially on the background. I hoped to get at least 25 frames (subs) here in Portugal but it's been cloudy for the past 4 days...

Enjoy patience and clear skies ;-)

B VERSION : reworked the color balance and sharpness... until more subs and Ha...

Comments

Revisions

  • M101 - a Pinwheel in 5 subs, 



    
        

            Ewam
    Original
  • Final
    M101 - a Pinwheel in 5 subs, 



    
        

            Ewam
    B

Sky plot

Sky plot

Histogram

M101 - a Pinwheel in 5 subs, 



    
        

            Ewam