Large Round Object Near Two Crossing Passenger Planes,

I was watching two passenger planes passing each other, forming a contrail cross in the sky when all of a sudden I spotted a large round object that appeared near one of the passenger planes. I watched as the object changed colour blending in perfectly with the sky making it invisible to the naked eye. The object was still visible with a full spectrum video camera, so I quickly took a photograph and watched it through the viewfinder of the camera for a while before it flew off heading east where unfortunately I lost sight of it. The photograph was taken at ‏‎1:04 PM on the 27th of January ‎2018, at Newton Abbot Devon England.