Photo at scenic area displays object in sky, upon digital scanning and zooming object is visible.

On the above date and time I was traveling enroute from Missouri to New Hampshire by private vehicle and stopped at a scenic overlook along Route 7 in southern Vermont at a place known as "Hogback Mountain" to stretch my legs and take photos of the scenery. I walked around there at a scenic overlook deck and took two still photographs using a disposable camera.  Later after the film was developed I noticed an odd speck on a photo taken from the scenic viewing deck looking south and dismissed it as a defect in the photo.  Yesterday while scanning and digitizing some old photos I scanned it and noticed zooming in that the odd speck was actually a white colored egg shaped object, with a completely black shadow on the bottom, and what appeared to be a rectangle red in color, and the appearance of a mirage shimmer along the left hand side of the object.
At the time I was observing and using the film camera I never saw the object, but upon zooming the scanned photo noticed an object in the shot.  I have the print from the photo lab available,but cannot find the negatives. I am uncertain as to the nature of this phenomenon.