(meteorobs) Two questions for meteorobs members

[GeoZay at aol.com]

>>QUESTION 2: 
Are the V(infinity) speeds  of meteors  corrected for the Earth’s gravity? 
The speed would be, by the time we see  the shooting  star have a downward 
component of 11km/s due to falling  by  gravity. This is in addition to the 
vector  combination of  the orbital motions of the meteor and Earth. 
How is the gravity   vector treated. Its direction varies with location of 
the observer   on Earth. Is it by convention the  vector for the radiant in 
the  zenith, parallel to the meteor-Earth  vectors? <<
 
I don't know how to word this, but I believe this question is tied to  
Zenithal Attraction. As a meteoroid approaches the earth, it will feel the  
gravitational tug. This tends to accelerate the meteor towards the center of the 
 earth. Meteor speeds will increase about 1 km/sec for very fast meteors 
and up  to about 5 km/sec for the very slow meteors. After entering the 
atmosphere, the  meteor will give the appearance of radiating from a region 
slightly shifted  towards the zenith. Now I don't know if this gravitational tug 
is added to a  shower members entry speed in literature or not, but I would 
think so. 
George Zay