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Contains:  M 101, NGC 5457
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Messier 101 (the Pinwheel Galaxy) in Ursa Major

Technical card

Dates:March 12, 2019

Astrodon Tru-Balance LRGB E-Series Gen 2 Blue: 30x600" bin 1x1
Astrodon Tru-Balance LRGB E-Series Gen 2 Green: 30x600" bin 1x1
Ha 3nm: 20x1200" bin 1x1
Astrodon Tru-Balance LRGB E-Series Gen 2 Luminance: 65x600" bin 1x1
Astrodon Tru-Balance LRGB E-Series Gen 2 Red: 30x600" bin 1x1

Integration: 32.5 hours

Avg. Moon age: 5.44 days

Avg. Moon phase: 29.94%

Basic astrometry details job: 2584469

RA center: 14h 3' 10"

DEC center: +54° 22' 8"

Pixel scale: 0.744 arcsec/pixel

Orientation: 89.534 degrees

Field radius: 0.439 degrees

Resolution: 3316x2661

Locations: E-EyE, Fregenal de la Sierra, Extremadura, Spain

Data source: Unknown


Messier 101 (NGC 5457) is a face on spiral galaxy 21.8 million light years distant in the constellation of Ursa Major. It is 184,000 light years in diameter with an apparent size of 28.8' x 26.9'.

The galaxy was discovered by Pierre Méchain on 27 March 1781, who described it a "Nebula without star, very obscure and pretty large, 6' to 7' in diameter".

[Information from: Atlas of the Messier Objects; Stoyan et al; Cambridge University Press 2008 (English edition)]

M101 was photographed between 13 February and 12 March 2019 from an imaging rig in Spain that is privately-owned and remotely-operated by Barry Wilson and me.

Capture details are as follows:

Telescope: TEC140
Camera: QSI 690
Filters: Astrodon
Mount: 10 Micron GM2000HPS

Ha: 20 x 1200s
Lum: 65 x 600s
Red: 30 x 600s
Green: 30 x 600s
Blue: 30 x 600s

A total of 32 hours and 30 minutes exposure.

Data: Steve Milne & Barry Wilson
Processing: Steve Milne



Steve Milne
License: None (All rights reserved)



Description: Minor tweaks to colour and saturation.


Description: A very slight 'lift' to the faint stuff.


Description: Attempt to be more subtle with core detail and final colours.

Sky plot

Sky plot


Messier 101 (the Pinwheel Galaxy) in Ursa Major, 


            Steve Milne