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: 27 (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
M92 is the ‘other’ globular cluster in Hercules. M92 lies to the northeast of the popular M13 globular cluster in a relatively lonely patch of sky making it a bit harder to locate, but well worth the effort. Interestingly, M92 is listed as being fainter than M13 (Mv 6.4 for M92 vs. 5.8 for M13), but I find the core of M92 to be a tad brighter than M13. The larger apparent size of M13 likely contributes to its slightly higher total integrated brightness.
This is the 3rd and last test image taken with my Unitron 155c in its stock configuration. Next up; moving the 155 over to my Atlas to see what it can do on a modern guided mount.
M91 currently rises in the northeast during the early evening.
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