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Technical card

Resolution: 6382x5166

Dates: March 13, 2016

Frames:
Blue: 52x453" bin 1x1
Green: 54x369" bin 1x1
Astrodon L-NIR: 46x1865" bin 1x1
Red: 57x363" bin 1x1

Integration: 41.7 hours

Avg. Moon age: 4.48 days

Avg. Moon phase: 21.04%

Mean SQM: 18.60

Astrometry.net job: 1545443

RA center: 194.966 degrees

DEC center: 27.892 degrees

Pixel scale: 0.718 arcsec/pixel

Orientation: 179.988 degrees

Field radius: 0.819 degrees

Locations: The Hills Observatory, Manchester, United Kingdom

Description

ACO 1656 in the Coma Cluster is a great place to see how many galaxies you can capture in one image. I have counted over 3000 in this image which is incredible when you consider where it was taken from. Note: I counted by dividing the image up into 100 segments and counting galaxies I could see in 10 of those segments at random and multiplying by 10.

Most of the exposures were taken with an Astrodon NIR filter (Near Infra Red), this allows me to take quite long subs, (30min) and is a great way of going deep when imaging galaxies as you can reach those that have red shifted a bit as well. NIR tolerates light polluted skies, but I tend to not image in NIR during periods of bright Moon light.

Mixed exposures were used and are shown as the average sub length for each filter. Taken between Jan 2015 and March 2016 on 20 nights.

For those people who saw this image during a lecture I gave to the Manchester Astronomical Society in Feb this year, this is a completely re-processed image right back to calibration as I was not happy with the first result.

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Author

Mike Oates
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ACO 1656 in the Coma Cluster , Mike Oates