Star Trails at the Farm

So, this is my first foray into doing star trails with multiple exposures. I set out to do about ~6 hrs worth of 30 sec exposures. I set it up, then walked away and went to bed. Well.... After about 120, the lens fogged/froze and the rest were blurry. I also realized my software cannot handle more than 395 images. I shot about 900. So now I know to pick a warmer night and expose longer for each image. For this I used a program called "Startrails" which stitches them together automatically.