Northolt Branch Observatories said: “This suggests that it is what is known as an empty trash bag object.
“A piece of light material (probably metallic foil), left over from a rocket launch.
“It is not clear yet when A10bMLz has been launched.”
They added: “It is orbiting the Earth in an unusual, retrograde orbit, at an average distance of 262,000 km.
READ MORE: Mars MYSTERY: NASA probes strange impact crater on red planet