Man Working On The Moon?

With the comet back on its way out, when was the dust ejected that makes up the comet dust trail: During the comet's prior return of around 83 BC, give or take a century, 2000 years ago at the beginning of our year count. The dust has since made one revolution, some particles making a wider orbit than others and returning later. There is a continuous stream of dust particles passing by Earth orbit, but only when the planets steer that dust trail in Earth's path do we see a meteor outburst.

Important because:

* Only known case in our lifetime: crossing of the dust trail of a known long period comet.
* Long-period comets, such as were Hale-Bopp, Hyakutake, and McNaught, tend to sneak up on us. They are a potential impact danger. What can the dust trail tell us about their physical nature?
* Their dust is a danger to satellites in orbit and man working on the Moon.
* Dust stream could contain material from original cosmic-ray produced crust of comet.