Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5447  ·  NGC 5449  ·  NGC 5450  ·  NGC 5451  ·  NGC 5453  ·  NGC 5455  ·  NGC 5457  ·  NGC 5461  ·  NGC 5462  ·  NGC 5471  ·  Pinwheel galaxy
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M101 from the city, 



    
        

            Edoardo Luca Radice (Astroedo)
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M101 from the city

Getting plate-solving status, please wait...
M101 from the city, 



    
        

            Edoardo Luca Radice (Astroedo)
Powered byPixInsight

M101 from the city

Equipment

Imaging Telescopes Or Lenses
C9.25
Imaging Cameras
Moravian Instruments G3-16200 Mark II
Mounts
10 Micron GM1000 HPS
Filters
Baader Planetarium G 2" · Baader Planetarium R 2" · Baader Planetarium B 2"
Software
Seqence Generator Pro · Pixinsight
Guiding Cameras
10Micron HPS System

Acquisition details

Dates:
April 22, 2020
Frames:
Baader Planetarium G 2": 44x300" (3h 40') bin 1x1
Baader Planetarium R 2": 44x300" (3h 40') bin 1x1
Baader Planetarium R 2": 44x300" (3h 40') -25C bin 1x1
Integration:
11h
Avg. Moon age:
28.98 days
Avg. Moon phase:
0.34%
Bortle Dark-Sky Scale:
7.00
Mean SQM:
17.50

RA center: 14h03m11s.373

DEC center: +54°2131.100

Pixel scale: 0.514 arcsec/pixel

Orientation: 90.099 degrees

Field radius: 0.390 degrees

More info:Open 

Resolution: 4368x3294

Locations: Castenedolo, Castenedolo, Italy

Data source: Backyard

Description

As for my previous picture of M99



the imaging session of this M101 was intended to test the latest gradient correction technique by Vicent Peris.

(the link to the original article can be found in the description of my M99 image)

M99 was a small target: the gradient correction is quite easy, so the idea was to test it on a larger target.

Here the reason why I choose M101.

IMHO this technique is going to be a MUST for city imagers

In version B you can see a direct comparison between original and corrected image

In version C you can see the large field image used for gradient modeling.

I took it with a Canon 60D at 800 ISO and an Letiz Elamrit - R 180 mm F 2.8 at F/4

140 x 20 sec subs.

Comments

Revisions

  • Final
    M101 from the city, 



    
        

            Edoardo Luca Radice (Astroedo)
    Original
  • M101 from the city, 



    
        

            Edoardo Luca Radice (Astroedo)
    B
  • M101 from the city, 



    
        

            Edoardo Luca Radice (Astroedo)
    C

C

Description: The reference image from the Canon 60D with the 180 mm lens used as a reference for the gradient modeling.

Uploaded: ...

Sky plot

Sky plot

Histogram

M101 from the city, 



    
        

            Edoardo Luca Radice (Astroedo)