Wow what a great shot; love the colour.
I'm guessing you were at 300mm when you took this. 1/500 is sort of the borderline shutter speed for getting sharp photos at that focal length. The longer the length, the faster your shutter speed needs to be to avoid camera shake, etc. I forget the exact ratio of shutter speed to focal length, but I have a 300mm prime and always notice a reduction in sharpness under 1/500.
If you're taking a moon shot with nothing in the foreground, I would open up your aperture as far as it will go. That will bump up the shutter speed without affecting the ISO, etc.
Also, I took a similar shot like this and adjusted the sharpness in photoshop and made a HUGE difference...really brought out the craters and such.
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