my friend and I were up at Mt Antero, gold parnning when I decided to take some pictures of the area. According to the GPS we were about 12 thousand,tree line. I took 3 or 4 pictures of the Mt Antero and the meadow. We proceeded to head down the trail taking more pictures of a beautiful stream That follows the atv trail. When I got home later That night( Colorado Springs) I reviewed the pictures I had taken' when I noticed the dark dull object in the picture. I asked my friend if he saw or heard any noise, we both looked over the photo and don't remember seeing or hearing it before I took the photo. We can only estimate the object to be above 13 thousand feet. We were 12 thousand. I've lived in Colorado all my life and have never seen anything I couldn't explaine. When we try to blow up the photo,it looks like there is a glow around it and its oblong.