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NGC 6559
Sagittarius
Peddler Hill, California
FS-128G @ F6 (ag, ST-4)
ST-10XME LLRGB (10 minutes each)

NGC 6559 is just to the north of the Lagoon Nebula.
There appears to be some field rotation, probably due to low altitude at which the image was acquired and a less than perfect polar alignment.

Definitely on the reshoot list for next spring.