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Contains:  M 13, Great Cluster in Hercules, NGC 6205
Getting plate-solving status, please wait...
M13 during full moon, 


            Doug.,N. Jiang
M13 during full moon

M13 during full moon

Technical card

Resolution: 3300x2615

Dates:April 19, 2019April 20, 2019April 21, 2019April 23, 2019April 24, 2019

Astrodon LRGB 1.25" E series Gen 2 - B: 103x120" bin 1x1
Astrodon LRGB 1.25" E series Gen 2 - G: 227x120" bin 1x1
Astrodon LRGB 1.25" E series Gen 2 - R: 205x120" bin 1x1

Integration: 17.8 hours

Avg. Moon age: 17.30 days

Avg. Moon phase: 89.51% job: 2665761

RA center: 250.559 degrees

DEC center: 36.264 degrees

Pixel scale: 1.267 arcsec/pixel

Orientation: 75.574 degrees

Field radius: 0.741 degrees

Data source: Own remote observatory

Remote source: Lijiang Gemini Observatory


The M13 project is an experiment for DSO under full moon. This is theoretically equivalent to imaging in highly light polluted area. The power of full moon is destructive to deep sky imager, it wipes out the milky way and almost anything faint in the sky. The uneven illumination as the moon at different distance of the target translates into various gradients in the integrated image. These gradients are exceedingly difficult to remove. Despite various attempts of DBE, reshoot flat for calibration, it remains in substantial amount in the image. This inhibits stretching substantially or difficult to reveal the dimmer object while remaining a reasonable even background.

As mentioned in the earlier M63 project, the rain season is approaching, the weather become increasingly unstable. I am lucky to pump out one more image before the serious rainfalls. Since it is a less serious project, I have invested much less time into the imaging stage. It concludes at the 16 hours mark.



Doug.,N. Jiang
License: None (All rights reserved)

Sky plot

Sky plot


M13 during full moon, 


            Doug.,N. Jiang