Nasa officials said on Saturday the defunct satellite which is due to come crashing down to earth would land in the next few hours.
The satellite was expected to pass over Canada, Africa or Australia and large stretches of the Atlantic, Pacific and Indian ocean.
Scientists said the risk to public safety was “remote”.
A French amateur astronomer took unique images of the spinning satellite which is the size of a bus.
About 500 kilos of debris was expected to burn up during re-entry. Officials said what’s left was expected to spread over an area of approximately 800 kilometres.
The satellite was launched in 1991 from the space shuttle Discovery. Its job was to study the atmosphere and the ozone layer.