Contains: NGC 7789
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NGC 7789 Open Star Cluster in Cassiopeia (with Ha)

Technical card

Resolution: 3364x2828

Dates: Aug. 31, 2017

Blue: 26x60" bin 1x1
Green: 20x60" bin 1x1
Ha 5nm: 24x1800" bin 1x1
Red: 23x60" bin 1x1

Integration: 13.2 hours

Avg. Moon age: 9.31 days

Avg. Moon phase: 69.89%

Mean SQM: 18.50 job: 1832975

RA center: 359.354 degrees

DEC center: 56.694 degrees

Pixel scale: 1.435 arcsec/pixel

Orientation: 0.130 degrees

Field radius: 0.876 degrees

Locations: The Hills Observatory, Manchester, United Kingdom


A view of this cluster like you have never seen before. This is a basic RGB image taken in about an hour. Then another 12 hours of Ha data taken as 24 x 1800s subs bin 1x1. The Ha is then added as a tonemap, (i.e. stars removed)

This Ha nebula is Very faint and still needs lots of processing to bring it out.

This is second such open cluster I have finished that shows faint Ha in the frame, the first one being M39.

Version C has better contrast and more saturation. After uploading the previous version, I was aware that it looked rather flat compared to the version on my PC



Mike Oates

Sky plot

Sky plot


NGC 7789 Open Star Cluster in Cassiopeia (with Ha), 


        Mike Oates