An unnamed witness who photographed the flying object from a back garden on Monday immediately reported the sighting to official investigators because they were so puzzled by it.
In a brief report to the Mutual UFO Network (MUFON) the homeowner, from New Orleans in America, said: “It blocked out the sun’s rays.”
The person said they “observed the object’s activity in all lines” of their vision.”
In the image it looks like a so-called cigar-shaped UFO, which left trail almost like that of a plane.
But the trail also appears to be lit up by sunlight.
The witness said the object almost had the appearance of a start before fading.
They added: “Watched star-like object doing sharp turns, flying across the sky and fading.”
MUFON investigators have so far been unable to pin down what the object seen at 11.16am local time could be.
They have listed the case as unresolved.
New Orleans has been a hotbed for UFO sightings according to the MUFON database.
It lists 36 sightings – 21 of which were since 2010 – but dating as far back as 1965
On July 18 1993 two men reported seeing a jet at a bout 20,000 feet, with another approaching that “made an erratic movement.”
One of them said: “From the opposite direction we notice what we thought was another jet heading right at it.