UFO Sighting in Sedona, Arizona on 2017-07-26 00:00:00 - Capturing rainbow and found object in the photo after. no objects in frames before or after

My husband and i were visiting sedona for the week and as we were driving this day, he noticed the rainbow first. i just got my full frame nikon and was really excited to capture it. i took several pics, aperature priority and with continuous shots. we both never saw anything in the sky besides the rainbow. there weren't planes or helicopters at the time. once i got to our office today, i was looking through the photos and noticed this object to the left of the rainbow. i was trying to be a skeptic (although i am admittedly not) and looked at all of the frames and this was the only one with the object.