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Contains:  M 101, NGC 5455, NGC 5457, NGC 5461, NGC 5471
Getting plate-solving status, please wait...
M101 from the city, 


            Edoardo Luca Radi...
M101 from the city
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M101 from the city

Technical card

Imaging telescopes or lenses: C9.25

Imaging cameras: Moravian Instruments G3-16200 Mark II

Mounts: 10 Micron GM1000 HPS

Guiding cameras: 10Micron HPS System

Software: Main Sequence Software Seqence Generator Pro  ·  Pixinsight

Filters: Baader Planetarium G 2"  ·  Baader Planetarium R 2"  ·  Baader Planetarium B 2"

Dates:April 22, 2020

Baader Planetarium G 2": 44x300" bin 1x1
Baader Planetarium R 2": 44x300" bin 1x1
Baader Planetarium R 2": 44x300" -25C bin 1x1

Integration: 11.0 hours

Avg. Moon age: 28.98 days

Avg. Moon phase: 0.34%

Bortle Dark-Sky Scale: 7.00

Mean SQM: 17.50

Basic astrometry details job: 3454874

RA center: 14h 3' 11"

DEC center: +54° 21' 32"

Pixel scale: 0.513 arcsec/pixel

Orientation: 269.776 degrees

Field radius: 0.390 degrees

Resolution: 4368x3294

Locations: Castenedolo, Castenedolo, Italy

Data source: Backyard


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.



Edoardo Luca Radi...
License: Attribution-NonCommercial-NoDerivs Creative Commons


  • Final
    M101 from the city, 


            Edoardo Luca Radi...
  • M101 from the city, 


            Edoardo Luca Radi...
  • M101 from the city, 


            Edoardo Luca Radi...


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

Sky plot

Sky plot


M101 from the city, 


            Edoardo Luca Radi...