NGC 7789 Caroline's Rose Cluster (Jim Raskett)

NGC 7789 Caroline's Rose Cluster

From Various Sources:

NGC 7789 is one of the oldest open star clusters known (about 1.6 billion years old). It sits in Cassiopeia amidst many stars of the Milky Way galaxy, although the compact nature of this open cluster makes it easy to identify.
NGC 7789 was discovered by astronomer and comet-hunter Caroline Herschel in 1783. It has become 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.
Caroline's brother William Herschel included the cluster in his catalog as H VI.30.
The approximately 1000 stars that may belong to the star cluster vary in brightness from 11 to 18 magnitudes. The distance is about 6000 to 6200 light-years, giving this cluster a true diameter of 50 light-years.

All the stars together are about 3000 times brighter than the Sun.

I really enjoy the sheer number of stars in this image.
I ran the final version through the Pixinsight ImageSolver script and it counted 34,622 stars!!!

Thanks for looking and comments welcome!

Jim

Original
B
C
D
Final
E

B

Description: Slight brightness change in both the cluster and the background.

Uploaded: ...

C

Description: Used the Adam Block/Russell Crowman methodology for reducing CA on the bright stars. The star color balance is a bit different, but I feel more natural

Uploaded: ...

D

Description: SCNR removed the very slightest greenish hue on the brightest stars.

Uploaded: ...

E

Description: Another revision trying to correct CA on the brighter blue stars. The previous revision was following Adam Block's method.
https://www.youtube.com/watch?v=4-D_e832lOo.
This method worked well, but definitely changed the star color balance (too much for my tastes).

This revision was done with lots of help from Ahmed Wegdan using a method that he outlined for me.
Outstanding reduction of the blue (CA) halo's without seriously effecting the color balance. Thanks Ahmed!

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	8850633
PixInsight job	S46HZFUZJ0IB9OH1V7FP7JD3FBQZKL72
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h57m24s.32
RA (top/left)	00h09m20s.45
RA (top/right)	23h58m05s.36
RA (bottom/right)	23h45m25s.47
RA (bottom/left)	23h56m46s.64

Dec (center)	+56°42′13″.2
Dec (top/left)	+56°35′10″.6
Dec (top/right)	+58°20′45″.6
Dec (bottom/right)	+56°44′57″.2
Dec (bottom/left)	+55°03′43″.0

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