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2005 yu55 is going to make a very close

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approach to the earth on the night of

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november eighth 2011 at that time its

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distance from earth will be just under

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nine tenths of the moon's distance away

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from us 2005 yu55 cannot hit earth at

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least over the interval that we can

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compute the motion reliably which

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extends for several hundred years it's

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going to be moving very rapidly as it

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traverses the sky near the earth on

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november seventh eighth ninth and tenth

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in effect it will be moving straight at

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us from one direction and then they go

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whizzing by and straight away from us in

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the other direction so it's it's motion

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across the sky will be close to 180

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degrees over the course of less than two

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days it made a close approach to earth

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about 18 months ago in April of 2010

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colleagues of ours at eros evo

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Observatory were able to observe this

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asteroid using the radar facility at

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Arecibo and they were able to obtain

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radar images that showed that this

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object is about 400 metres across on

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november eighth ninth tenth will be

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observing it again this time with both

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the air SIBO telescope and with the

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Goldstone telescope here in california

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this is the closest approach by an

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asteroid that large that we've ever

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known about in advance the radar

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telescopes that we use to observe

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asteroids are very large radio dishes if

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the Goldstone telescope is 70 meters

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which is 240 feet across so it's truly

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enormous and Arecibo is even larger

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still the Goldstone telescope has a new

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radar imaging capability which has just

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become available that will enable us to

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see much finer detail than has

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previously been possible and depending

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on how we transmit the signal we can get

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different types of data it shows us how

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big it is it can show us features on the

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asteroid it can tell us information

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about the asteroid rotation period we

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should be able to tell much better with