There is a one in 250,000 chance that asteroid Apophis could hit Earth in 2036.
The asteroid, which is slowly approaching earth tonight will allow experts to examine risk, of how likely it is to hit.
Slooh, a web based sky service, collects images from observatories around the world.
Members of the public can view the event online via their website.
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The book by Cameron comms chief Sir Craig Oliver reveals that Mr Cameron was frustrated with Theresa May's neutrality during referendum.
Cloud and outbreaks of rain will ease away eastwards during the morning, clearing the east coast around midday with sunny spells developing.
Police and emergency services are attending the scene.