The two men who witnessed it say they are usually cynical of sightings but are at a loss to explain the phenomenon. They say they were even more surprised to see reports in a national newspaper this week of a similar unidentified flying object seen by residents of a Yorkshire town.
The object also bears a striking resemblance to a UFO pictured in the skies above Belgium in the early 1990s.
Nick Wheeler, 61, who works at a medical equipment suppliers on Sowton Industrial Estate, first saw the UFO outside his home in Haldon View Terrace on Saturday. It was also seen by his partner Richard Coombe.
"I don't smoke inside and had stepped out for a cigarette," he said.
"It must have been about eight in the evening and I was looking at the sky when I saw this brightly-lit arrow-shaped object. At first I thought it was a helicopter but as it got closer it became apparent it was moving completely silently.
"I called to my partner and he came out and saw it too. It went over the top of the house and we went through to see it at the front but it had vanished. I have been wracking my brains for an explanation, I know people report Chinese lanterns as UFOs but there was no way it was one of them.
"I was stunned when I picked up a newspaper on Monday to see an object had been photographed above Rotherham that looked exactly the same."
The Rotherham UFO, also a triangular and lighted object, was seen Nayab Ahmed, 19, whose friend Anny Cummings, 18, took the picture.
Several residents of the South Yorkshire town saw it creep across the sky one day earlier this month. Eerily it looks just like an object spotted over Belgium 20 years ago which so spooked authorities that F-16 fighter jets were scrambled to intercept it.
Mr Ahmed, 19, said: "It moved really slowly but occasionally it'd shudder. It was completely silent."
Nick Pope, ex-head of the Ministry of Defence's UFO unit, said: "Some might suspect secret prototype aircraft and drones, but we test such craft in restricted military areas, not built-up places."
No one from the RAF was available to comment on the sightings.
October 30th 2010 about 7.15pm I saw 5 red globe shaped things fly silently from South towards the North, going as fast as a light plane, there was no noise at all, after they had dissapeared there was a strong smell of parrafin.