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Ahmad Zaigham photographed the unidentified object from his home in South Harrow, North West London.
Mr Zaigham, 30, said: "I was immersed in the TV programme when just by chance I saw this uncanny light in the sky and I was instantly mesmerised."
The computer engineer was able to take one shot of the object whilst it was stationary for a few seconds. He said: "Then it moved rapidly up and above at incredible speed, a comparable speed to a fighter jet at full power, so fast that panning the camera in the direction was impossible."
Mr Zaigham added the object made a "whistle kind of sound" and seemed to "quickly fade in light" after he took his picture. "The light coming from this thing is something I have never seen the like. I dont think any aircraft has a light like this," he said.