The following link describes lens flare phenomena: https://en.wikipedia.org/wiki/Lens_flare
Does the file image at the following link depict lens flare? https://goo.gl/KQsKGV This is a follow-on to the Any Ideas thread initiated by Robin on 2017/06/15. Terry raised the question about the “UFO” in the image being lens flare.. The image was apparently created in 2008/02 by a street level camera. The original links that Robin identified no longer include a file of the image in the web page image noted above. The link is a Google URL shortener IMHO and was not erased from the Google server. It remains to see how long the shortener remains as a link to the original image identified on 20017/06/15 by Robin. Mysterious things happen on the internet. Bob Cook