The "craft" was reportedly photographed by a man, who had to "bend over backwards" to get it in sight above an oil refinery.
The extraordinary image was revealed to the audience at the Outer Limits Magazine 70 Years of the Modern UFO Era conference in Hull by UFO investigator Malcolm Robinson.
Mr Robinson, who has investigated UFOs since the 1980s, said it was the most remarkable UFO picture he has come across.
He told the audience that two men were photographing the BP oil refinery at Grangemouth, central Scotland, at night when they spotted a distant red object.
It then flew directly towards them, he said.
He said: "This red ball of light shot across towards them and was 200 to 300 feet above when he took the picture.
"He literally had to bend over to take it.
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