Re: Sharpless 217
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Ghostly red cloud.
From: DarkSkyNewMexico@groups.io <DarkSkyNewMexico@groups.io> On Behalf Of Dan Crowson
Sent: Saturday, April 4, 2020 7:01 PM
To: 'Dan Crowson' <dcrowson@...>
Subject: [DarkSkyNewMexico] Sharpless 217
Sharpless 217 (LBN 745) is a hydrogen alpha emission region located approximately 14,200 light-years away (https://iopscience.iop.org/article/10.1088/0004-6256/150/5/147/pdf) in Auriga.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged March 5th and 6th, 2018 and December 27th and 29th, 2019 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.
I also captured 12 hours of Ha but it didn’t really add anything to the image.