Telescope: Astro-Tech 8” f/8 Ritchey-Chretien, Orion Atlas EQ-G
Camera: Canon EOS Ra, Baader Mk III MPCC, GSO IR Blocking Filter
Guide scope: Astro-Tech 60mm, ZWO ASI120MM mini, PHD2
Exposure: 57x30sec, gain ISO 800 saved as RAW, dithered every 2 images
Darks: Internal
Flats: 32x1sec, Tee shirt flats taken at dusk
Average Light Pollution: Red zone, Bortle 8, fair transparency
Lensed Sky Quality Meter: 18.6
Stacking: Average, 1 sigma clip
White Balance: Nebulosity Automatic
Software: Backyard EOS, Deep Sky Stacker, Nebulosity, Photoshop
This is M13, the Great Cluster in Hercules. Also in the picture is the galaxy NGC 6207 (Mv 11.6) in the upper left along the top edge of this field, and about halfway between NGC 6207 and M13 is the tiny galaxy IC 4617 (Mv 15.2) . If you look carefully at M13 you can see a dust lane to the lower left of the cluster. This is a very unusual feature for globular clusters and it is not clear if this is actually associated with M13 or simply lies in the line of sight with the cluster.
M13 currently rises in the northeast during the early evening.
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