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Interesting grouping. Thanks for sharing them.
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On 7/19/2020 1:30 PM, Dan Crowson
Hickson 81 consists of PGC 57777, 2MASX
J16181406+1247202, 2MASS J16181481+1247361 and 2MASX
J16181367+1248108. These appear to be collectively cataloged
as UGC 10319, too. These are located at an unknown distance in
Luminance – 24x600s – 240 minutes – binned
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged June 10th, 17th
and 18th, 2020 from Dark Sky New Mexico at Rancho
Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an
Astro-Tech AT12RCT at f/8 2432mm.
LRGB - https://www.flickr.com/photos/dcrowson/50130294998/sizes/l/
Dan Crowson dcrowson@...
Dardenne Prairie MO http://www.crowson.com