Corinne Federer, of Amsterdam, didn't even see the strange object she managed to capture until she reviewed her photos.
"We heard nothing, it was completely quiet out. The more I flipped through the frames, it was kind of creepy," Federer said.
Federer was shooting in HDR mode, meaning five photos were taken at varying exposures within just one second, and as she flipped through them, a shadow revealed itself.
"I've been shooting for quite some time and I've seen other stuff in the news, but I've never seen anything [like this] with my own eye," she said. "It was a tubular-shaped object that had an S-shaped fin on it. If it had been any type of missile, it would've had multiple fins, but facing the same direction."
She explained that the images were shot at a relatively fast shutter speed -- 1/250 -- but the object was blurred and only appeared in the middle frames of the five, not the first or last.
Using some photo-manipulation software, Federer said enhanced the grayscale and contrast to clarify the image, but according to Ben Hansen, a former FBI agent with photo analysis expertise, the image is the real deal.
"Having reviewed the raw files, there's no overt indication that the photos have been manipulated with post editing software," Hansen said.
"The object's appearance is internally consistent with the rest of the photo," Hansen explained. "For instance, look at the darker area of the underside of the object compared with the clouds. The shadowing is similar on the underside as well as the lighting on the top of the object and the clouds where the sun is brightest. Having the sun in the frame is helpful because it indicates where shadows should appear. This further supports that the object was photographed 'in-camera' and not added later."
Hansen guessed the photo had actually captured a flying insect, not an alien ship. He did, however, spot a another object in one of the frames, higher and without any protrusions.