From: rstokes1@san.rr.com   
      
   "R. G. 'Stumpy' Marsh"  wrote in message   
   news:8lptj0ln0eqhj8mf3jaesbtmnl86fgn14h@news.xtra.co.nz...   
   > In message ,   
   > abdul.ahad@ntlworld.com (AA Institute) wrote:   
   >   
   > The proper motion of Alpha Centauri would completely swamp your data   
   > if you are considering comets with periods on the order of 27 million   
   > years.  Alpha Centauri has a radial velocity of 22km/s   
   > , so in a million years it   
   > travels 22*60*60*24*365*1000000 = 6.94*10^14km, or the better part of   
   > a light-month, relative to the Sun.  That's about half the current   
   > distance in one orbit of your comets-of-interest.   
   >   
   You've accidently dropped a few powers of 10 - in fact it's73 light-years in   
   a million years!   
   > --   
   > R.G. "Stumpy" Marsh.   
      
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