Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5457  ·  NGC 5477
M101 & NGC 5477 (HaRGB), 


            Mike Oates
M101 & NGC 5477 (HaRGB)
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M101 & NGC 5477 (HaRGB)

M101 & NGC 5477 (HaRGB), 


            Mike Oates
M101 & NGC 5477 (HaRGB)
Powered byPixInsight

M101 & NGC 5477 (HaRGB)

Acquisition details

Feb. 6, 2015
Blue: 44×180(2h 12′) -25°C bin 1×1
Green: 35×180(1h 45′) -25°C bin 1×1
Ha 3nm: 30×1390(11h 35′) -25°C bin 1×1
Red: 31×180(1h 33′) -25°C bin 1×1
17h 5′
Avg. Moon age:
17.02 days
Avg. Moon phase:

Basic astrometry details

Astrometry.net job: 544710

RA center: 14h03m18s.5

DEC center: +54°2306

Orientation: 179.706 degrees

Field radius: 0.455 degrees

Resolution: 2736x2045

File size: 2.1 MB

Locations: The Hills Observatory, Manchester, United Kingdom

Data source: Backyard


Taken over 6 nights from 27 Dec 2014 to 6 Feb 2015. Made using Ha and separate R, G, & B filters. This image is a crop from a [url= http://www.astrobin.com/156674/B/]wider field [/url]. All processing is done in PixInsight.

The Ha exposures were of different lengths, 600, 900, 1200 & 1800s.

NGC 5477 is a small galaxy to the left of the image.

I never thought I would be able to take RGB images from my home in light polluted Manchester UK. I believe this is only possible due to the Astrodon filters I use which has a slight gap between the green and red. The subs I have used here are just 180s but I know I can go up to about 8min which I will be doing from now on.

Note: The first upload was the wrong scale, the second version is the correct size.



  • M101 & NGC 5477 (HaRGB), 


            Mike Oates
  • Final
    M101 & NGC 5477 (HaRGB), 


            Mike Oates

Sky plot

Sky plot


M101 & NGC 5477 (HaRGB), 


            Mike Oates