(meteorobs) Earth-grazer definition question

[Chris Peterson]

I'd be cautious defining an Earth-grazer based on its path length 
(apparent or actual). Even a meteor which leaves the atmosphere again 
could have a very path if it is very shallow and just barely passes 
through the upper atmosphere.

Chris

*******************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

On 11/20/2015 1:31 AM, Roberto Gorelli wrote:

> Sorry for the bad English.
>
> It's to remember that there isn't a scientific definition of a
> "earth-grazer" in the same way that there isn't a scientific
> definition of "bolid".
>
> An earth-grazer should to be the meteors/bolids that cross the entire
> sky from an horizon to the other in the opposite side, but this it's
> only the apparent view from a single observer in a single locality.
> In the all day observations we can to said, IHMO, that a meteor/bolid
> was an earth-grazer when crossed over 90° of the sky, in this way each
> observer can to said a number of that events in its observer live.
>
> Only the bolid of 10 August 1972, and perharps some others (not more
> of 5-10 in the past century), that entered and exit from the Earth
> atmophere, was a real earth-grazer, then if only it can to be
> denominated "earth-grazer" probably we never shall see in our live a
> similar phaenomena (earth-grazer).
>
> Then the question is: do we are speaking of a apparent or of a real
> earth-grazer?
> Best greetings.
> Roberto Gorelli