The UFO was traveling very fast, and silently. It took only two seconds for it to cross the five degrees field of view, according to the witness.
He described the UFO as having a dull but uniform gray color and a very clearly defined boomerang or V shape. It had no visible lights, which probably explains why the witness was unable to observe the structural details of the UFO.
But he noticed that the arms of the boomerang tapered gradually and that the edges were very clearly defined, yet it did not appear to be entirely flat.
The witness observed the object gliding smoothly from north to south at about 46 degrees elevation without changing direction or altitude.
"It appeared to glide very elegantly and smoothly from north to south at roughly 46 degrees elevation. It did not change direction or altitude."
He tracked the UFO with his binoculars until it passed behind his house. He got up from the chair and moved away from the house to keep the UFO in view but it disappeared abruptly.
The witness was surprised at the sudden disappearance of the UFO. He remarked that he had never seen anything like the UFO in the 50 years of his experience as an amateur astronomer.
And while thinking about the sighting, he recalled that his wife, also a highly experienced amateur astronomer, had reported seeing an identical UFO in 1968 while observing the skies from her parents' backyard on the west side of Chicago.
She reported sighting three identical gray-colored, boomerang or V-shaped UFOs that appeared suddenly as she observed the night sky near Orion's Belt with a telescope.
The UFOs then disappeared as suddenly and as mysteriously as they appeared.
He also recalled that his parents -- also experienced amateur astronomers -- reported sighting an identical UFO in 1947. According to the witness' parents, the UFO zipped silently across the night sky in a matter of seconds -- much faster than known jets at the time.
The witness noted that the January 2 sighting was baffling and appeared to challenge his conviction that most objectively verifiable but unresolved cases of UFO sightings were either secret military aircraft undergoing flight-testing or unknown atmospheric phenomenon.
The sighting appears to confirm a widely held view in the UFO community that boomerang- or V-shaped UFOs could belong to a class of alien surveillance crafts related to "black triangle" UFOs.
Black triangle UFOs are a special class of UFOs that have been sighted since the late 1980s in the U.S., the U.K., and other European countries.
Skeptics believe that the UFOs are linked to highly classified military research and development projects. But UFO enthusiasts often cite the Belgian UFO wave, a series of black triangle UFO sightings that lasted from 29 November 1989 to April 1990, as evidence that some -- if not all -- could be alien surveillance crafts.
During the Belgian UFO wave, Belgian F-16s that scrambled to intercept two black triangle UFOs were outmaneuvered after pilots achieved successful missile lock on two occasions.
The incidents suggested to UFO enthusiasts that black triangle UFOs could be advanced alien stealth crafts deployed to conduct regular Earth surveillance missions.
[Image via NASA/Wikimedia]