Hi, Ares. Noticed you had linked to one of my threads so here's a few ideas that might help.
Because you are viewing a full Moon, you'll get away with using the cheat of luminosity, without any tricky masking work to stop it showing on the dark side.
For that glow, I also cheat. The glow from our real Moon obviously happens in our own atmosphere but in TG that's quite difficult to achieve, probably possible with high GI in atmo' but this way doesn't need any GI at all, much quicker.
Make a new atmosphere node, connect it to the Moon. Drop all bluesky/redsky values to '0'. Make the haze density white and very small(0.01, maybe lower), go to the height control tab and stick an extra couple of zeros to the end of 'haze exp height' for starters. All other height values can be left alone. You don't need to zero the bluesky glows but I usually do to keep it easy to see what I'm using.
Now the haze should be visible around the Moon. Adjust the haze exp' height and density until the 'Moon glow' looks right.
The only values you should need to touch are these, a quick test with the following settings work well on a Moon that's scaled to the right size(larger planet radius like your one might need some different values but the idea is the same, the exp' height just controls the distance the haze reaches round the surface) for me; haze density=0.01, horizon colour=1, haze exp height=300000.
If there's still problems, I'll check back and see if I can help any more.
