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Wow Dan. I really like this one. I have never seen an open cluster with so many stars in the background. Usually the background is black.
From: DarkSkyNewMexico@groups.io On Behalf Of Dan Crowson
Sent: Thursday, October 3, 2019 3:31 PM
To: 'Dan Crowson' <dcrowson@...>
Subject: [DarkSkyNewMexico] M23
M23 (NGC 6494 and others) is a trumpler (https://en.wikipedia.org/wiki/Trumpler_classification) class I 2 r open cluster located approximately 2150 light-years away in Sagittarius.
I also caught asteroid 74 Galatea while capturing the luminance. The trail can be found under a star on the left side of the image just below center.
Luminance – 12x600s – 120 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
240 minutes total exposure – 4 hours
Imaged September 26th and 27th, 2019 at Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG ST-8300M on an Astro-Tech AT90DT at f/6.7 603mm.