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M101 & NGC 5477 (HaRGB)

Technical card

Resolution: 2736x2045

Dates: Feb. 6, 2015

Frames:
Blue: 44x180" -25C bin 1x1
Green: 35x180" -25C bin 1x1
Astrodon Ha 3nm: 30x1390" -25C bin 1x1
Red: 31x180" -25C bin 1x1

Integration: 17.1 hours

Flats: ~30

Bias: ~200

Avg. Moon age: 16.58 days

Avg. Moon phase: 96.34%

Astrometry.net job: 544710

RA center: 210.827 degrees

DEC center: 54.385 degrees

Orientation: 179.706 degrees

Field radius: 0.455 degrees

Locations: The Hills Observatory, Manchester, United Kingdom

Description

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 wider field . 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.

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Author

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