Visibility II / V
In the constellation of the dragon, right next to the Swan, there is one of the planetary nebulae on the Abell list, Abell 50. The object is also listed on the NGC list under number 6742. The nebula is a little over 30 arcseconds very noticeable from a dark spot with a 20cm tube and an OIII filter. When photographed, both OIII and H-alpha gave an almost similar result.
I collected a HOO version of the picture where H-alpha is placed in red and OIII in blue and green color channels. This small object does not seem to have been photographed very diligently, although it is very noticeable and can be found in the high sky.
The second image shows the OIII stack and the third the H-alpha stack
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