I was working at a gas plant facility. it was approx. 12:45 and i took a pano picture of the whole facility. the picture took approx. 10 seconds to take. when i looked at the picture on the camera, i noticed a black dot on in the sky. i look up immediately from the picture but the object was not in sight any longer. when i zoomed in on the object it looks black and cylinder type shape to it and it was just hovering over the plant.