http://dad2059.wordpress.com/2008/04/01/ancient-sumerians-record-meteor-event/This article seems to think the ancient Sumerians astronomers recorded meteor event which may have caused the flood 5000 years ago.
Even if there was a celestial body agitating and increase in meteors hurled at earth on a 5000 year rotation it would be hard to prove. Many impact craters created by asteroids are simply hidden. They happen in areas which leave little or no visible record like the ocean or places where grow over can obscure their existence. Also, it isn't like there is a multitude of cave paintings from 10k years ago found on every spec of land across the globe to act as a human record of these sorts of events. Scientist speculate there were only approximately 8 million humans on the planet 10k years ago. Now factor in Earth's mass total: 510.072 million sq km of which land: 148.94 million sq km and water: 361.132 million sq km, note: 70.8% of the world's surface is water, 29.2% is land. How much of that can 8 million people cover as ancient reporters of celestial events?
An Oregon scientist's theory says incoming space junk wiped out the Clovis people 13,000 years ago, leaving diamonds behind as an intriguing clue. I don't know but is it possible their time line is off and the actual events happened either 10k years ago or 15k years ago. Just not sure on how the scientist achieve their date accuracy. But it is an interesting theory that attempts to explain the disappearance of not only the Clovis people but many of the animals like the mastodons and giant sloths in North America around the same time.
http://crosscut.com/2009/02/11/science-environment/18840/