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NGC 7789 – Open Cluster in Cassiopeia – LX65, 600Da

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#1 jgraham

jgraham

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Posted 22 October 2021 - 06:27 PM

Telescope: LXD75 SC8 @ f/6.3, LX65 mount, altaz mode
Camera: Baader modified Canon 600Da, interval timer
Filter: GSO IR Blocking Filter
Guide scope: None
Exposure: 39x10sec, ISO 1600, saved as RAW
Darks: Internal (Long Exposure Noise Reduction On)
Flats: 32x1/25sec, Tee shirt flats taken at dusk
Average Light Pollution: Red zone, Bortle 8, poor transparency, moonlight
Lensed Sky Quality Meter: 18.1
Stacking: Mean with a 1-sigma clip.
White Balance: Nebulosity Automatic
Software: Deep Sky Stacker, Nebulosity, Photoshop

 

NGC 7789 (9-17-2021)-1j.jpg

 

NGC7789 is a large and wonderfully rich open cluster located just west of Cassiopeia. It was discovered by Caroline Herschel in 1782 and is sometimes called Caroline’s Rose. It is a delicate object in small to moderate scopes, but blossoms into a rich field in large telescopes. When viewing this cluster I like to spend some time with the field. At first all I will see are the foreground stars and perhaps a soft glow in the background. As my eye adjusts, the first faint stars appear, and then it slowly blooms into a beautiful patch of stardust.


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