Contains: NGC 884, Double cluster, NGC 869, The star 7Per

Image of the day 12/11/2017

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Double Cluster in Perseus (with Ha) (NGC 884 & NGC 869)

Technical card

Resolution: 3373x2762

Dates: Nov. 18, 2017

Blue: 18x60" bin 1x1
Green: 18x60" bin 1x1
Astrodon Ha 3nm: 40x1800" bin 1x1
Red: 15x60" bin 1x1

Integration: 20.9 hours

Avg. Moon age: 0.01 days

Avg. Moon phase: 0.00%

Mean SQM: 18.50 job: 1854031

RA center: 35.099 degrees

DEC center: 57.139 degrees

Pixel scale: 1.435 arcsec/pixel

Orientation: 0.123 degrees

Field radius: 0.869 degrees

Locations: The Hills Observatory, Manchester, United Kingdom


Initially a very quick image, all 60sec subs taken on one night (26 Aug 2017). Processed in PixInsight using the new PhotometricColorCalibration (PCC) process. Then finished off in PhotoShop.

This is another in my series of star clusters showing Ha regions not normally seen. This is a basic RGB image taken in about an hour. Then another 20 hours of Ha data taken as 40 x 1800s subs bin 1x1. The Ha is then added as a tonemap, (i.e. stars removed)

This Ha nebula is extremely faint requiring lots of integration.

The other cluster images with Ha I have published here on Astrobin are NGC 7789 & M39.



Mike Oates

Sky plot

Sky plot


Double Cluster in Perseus (with Ha) (NGC 884 & NGC 869), 


        Mike Oates