Contains: NGC 7789
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Caroline's Rose open cluster in Cassiopeia ( NGC7789 )

Technical card

Imaging telescope or lens: Celestron CPC 800 XLT

Imaging camera: Canon 600D

Focal reducer: Celestron f/6.3 Focal Reducer

Software: Adobe Photoshop Express for AndroidSequator

Resolution: 3744x2496

Dates: Feb. 12, 2018

Frames: 150x30" ISO1600

Integration: 1.2 hours

Darks: ~16

Flats: ~21

Avg. Moon age: 26.46 days

Avg. Moon phase: 10.28%

Temperature: 3.00 job: 1927657

RA center: 359.306 degrees

DEC center: 56.752 degrees

Pixel scale: 0.687 arcsec/pixel

Orientation: 306.671 degrees

Field radius: 0.429 degrees

Locations: Home Stockport, Stockport, Cheshire, United Kingdom


A couple of hours of clear sky in Stockport last night! I kept experimenting with this setup: celestron cpc800 and celestron focal reducer f/6.3 with canon 600d prime focus. This time I have aimed to the beautiful open cluster ngc7789 in cassiopeia. The image is heavily cropped to get rid of what I think was inaccurate flat correction or the infamous pupil ghost that affects the f/6.3 focal reducers.

150x30s light frames @1600 ISO
16 dark frames
21 flat frames

From Wikipedia (
NGC 7789 is an open cluster in Cassiopeia that was discovered by Caroline Herschel in 1783. Her brother William Herschel included it in his catalog as H VI.30. This cluster is also known as "The White Rose" Cluster or "Caroline's Rose" Cluster because when seen visually, the loops of stars and dark lanes look like the swirling pattern of rose petals as seen from above.



michele vonci



I processed better the subs and managed to crop a larger area. A bit more noisy but more enjoyable!

Sky plot

Sky plot


Caroline's Rose open cluster in Cassiopeia ( NGC7789 ), 


        michele vonci

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UK Astro-Imaging