Blue Mars

On 27th June 1991 scientists working at the Arecebo radio telescope on Peurto Rico discover a very large Kuiper Belt object has been displaced and is moving into the solar system.

By the 7th July 1991 they have established that it is 145-155km across.

By the 18th August they have established that it will enter the inner solar system in 1997. it will miss the earth and go around the sun, however due to the close pass of the sun the exit trajectory is not known.