Astrophotography diagnosis of jupiter: Bad seeing

The 93 % waxing gibbous Moon has no impact here: in planetary imaging the target is far brighter than the sky background, and both lunar and urban light pollution are non-issues. The only sky parameter that matters is turbulence, and that is exactly what limits this image. The slightly softened limb and the blurred festoons in the north equatorial belt point to average rather than good seeing. If you can pick your nights, favour evenings with a weak jet stream (Meteoblue seeing charts or Windy at the 250 hPa level) over merely clear ones: in planetary work, a transparent but turbulent night delivers less than a hazy but stable one.

The 0.01 degree field confirms a long focal length configuration consistent with a C8 plus Barlow: Jupiter fills roughly two thirds of the frame height, a good compromise between resolution scale and recentring margin for drift. The C8 is a well suited instrument for Jupiter, capable of reaching sub arcsecond detail on a good night. The image scale looks appropriate: this is not the soft oversampled case where the disc is huge and empty of detail. Just make sure the tube is fully cooled before each session, a closed C8 easily needs an hour to stabilise, and tube currents mimic exactly the seeing you are suffering from here.