NGC 7789 - LRGB (rhedden)

NGC 7789 - LRGB

NGC 7789, or Caroline's Rose, is an open cluster in Cassiopeia that was always one of my favorite targets for visual astronomy. It's amazing that it took me so many years to produce an image of it. I actually had to image it twice, as the first attempt produced questionable star colors and a few problematic halos, having been captured through 10 year old, lower-priced filters. The second attempt, shown here, was captured with brand new Chroma filters, which produced pleasing star colors.

The faint halo around the bright, orange star is not the fault of the filters, nor is it a nebula. It's due to very thin fog that hung over my area on every clear night from July through the end of September due to excessive rainfall. I'm sure that some lingering forest fire smoke had something to do with it as well. I like the image a better with the slight crop in the "final" revision. The full field of view is shown in the other revision just in case there is something of interest I've overlooked.

After many years, I still haven't figured out a reliable method to process "naked" open clusters that lack nebulosity. They simply look better through an eyepiece. It seems the best way to dress them up is to image with a telescope that produces strong diffraction spikes, but one ends up wondering why the artifacts make the image look better. I wonder if an animated GIF that captures the twinkling of the stars due to the effects of seeing could produce an eyepiece-like image?

Astrobin had a hard time plate-solving this image, as did one other program I use. I think the abundance of stars makes it difficult to determine the image scale, as the plate-solving worked once I entered the image scale manually.

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Title: full sensor - not cropped

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Status	Basic success
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Astrometry.net job	8978646
PixInsight job	n/a
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NGC 7789 - LRGB

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