Telescope: Stock Unitron 155c 4” f/15 refractor
Camera: Canon EOS Ra full frame DSLR
Filter: 2” GSO IR Cut Filter
Guide scope: None
Exposure: 28 (of 32)x15sec, ISO 6400, saved as RAW
Darks: Internal (Long Exposure Noise Reduction)
Flats: 32×1/20s tee shirt flats taken at dusk
Average Light Pollution: Bortle 8, poor transparency, haze, low altitude
Lensed Sky Quality Meter: 18.3 mag/arc-sec^2
Stacking: Mean with a 1-sigma clip
White Balance: Nebulosity Automatic
Software: Backyard EOS, Deepsky Stacker, Nebulosity, Photoshop
This is M13, the Great Cluster in Hercules. If you look carefully you can glimpse the tiny galaxy NGC 6207 (Mv 11.6) in the upper left corner as well as a dust lane to the lower left of the cluster. The dust lane 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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