I thought because of it's odd shape and that it showed up on different nights I may have had something but I received a great explanation, so thought I'd share it with you guys so we can all learn. It has to do with lens being convex, but I'll let someone else explain it better than I can.
If we look at the Orb you'll see the location on the outside of the picture. The lens is convex and the orb is towards the outside of the lens causing the strange shape. You also get a strange shape by your For most cameras the aperture is so near to circular that all your orbs will appear circular. For some cameras, however, the lens aperture might be hexagonal or even diamond-shaped. You will find that all the orbs taken with such a camera will appear the same odd shape. Just how pronounced this diamond or hexagonal shape may vary from shot to shot, depending on how wide the aperture is (the f-stop). The odd shape might even vanish altogether very rarely These odd-shaped orbs demonstrate that orbs are caused by the camera and not the environment.
Other shapes can arise from orbs overlapping but they are always derived from different arrangements of the basic orb shape. This, again, implies a photographic artifact rather than an external object.
The lower part of ths information was from http://www.assap.org/newsite/htmlfiles/Greatorbs.html#Intensity