Black flying saucer in the downtown of Caledonia, USA

On May 23, 2016, during sunset, an inhabitant of Caledonia (in California) has photographed a dark flying saucer over houses of a street. Witness says that UFO did not appear on other pictures.

Witness report:

Took pictures of sunset. When returned home noticed object in picture. One picture contained the object but other pictures of same sunset after taking the first picture did not contain the object.