Frank, that is one excellent shot. I presume you will now want to go to the SX50 and get us 1000mm???
As for hand held vs tripod shots - the EXIF says it all. The reason a tripod seems useful is because it can be difficult to keep stable when pointing the camera straight up. Just being to lean against something is usually enough.
Here is one of mine taken in daylight, handheld, no support. Not exactly no suport, I tend to use my forehead to get some support for high angle shots. 300mm, f8, 1/125, iso 100.
https://lh4.googleusercontent.com/-T...11104_9814.jpg.
Full moon shots can be very nice particularly if complemented with a nice landscape. All by itself, it is too bright to bring out the crater shadows etc. Of course if someone with a super lens or a telescope may get some really great shots.