Great shot! And welcome to the forum!
If using autofocus, the camera needs a high contrast point to focus on, so you need to position it over the middle focal point. Once it gets focus lock, switch to manual focus so it doesn't change, then compose your shot.
If auto-focus can't lock on, you'll have to judge it manually, which can be really hard if you're trying to look through the viewfinder at night. If you've got time, take some short exposures and look at focus, before taking the longer one. Might be a bit hard with a bird though
If you'd like, send me the fullsize shot via email, i'll see if I can make it sharper. mike at iceinspace.com.au