ufo probe fan of softball

While going through some photos I took during a softball game I noticed that this object was in 3 photos in almost the same area for at least 2 innings. As I will not show the whole images yet due to the fact that some people in the photos do not want their image on line...fair enough, I'll just pix them out and post them later. That would show that at least a half an hour had passed between pictures. The round object in the photo above is the baseball. The odd object could not be a bug due to the length of time between shots. It appears to be about 500ft. up and maybe a quarter mile or so away. The odds of a bug being in almost the same spot and distance away in 3 photos must be rather high. It isn't an airplane or helicopter as it was not noticed during the game. Is it a UFO?? Don't know, but it is rather odd.