(meteorobs) Hypervelocity meteors

Karl Antier ka.antier at wanadoo.fr
Tue Dec 11 12:10:21 EST 2007


Hi George, hi all,

Just a small question about geocentric meteor velocities that I never manage
to fix... As the question is raised...
You say :
> What this boils down to is that the slowest geocentric velocity a meteor can 
> have while in a solar orbit is 11 km/s (7 mps). Visually a meteor at this speed 
> looks as if it’s crawling along. 
Why isn't the slowest meteor velocity in a geocentric coordinate system 0 km/s ?
I imagine 11 km/s has something to due with terrestrial escape speed, but why couldn't
a meteor have a smaller speed in geocentric coordinates ?
Imagine a meteor following the Earth. It would have 0km/ relative speed.
Make it go faster, it'll enter the Earth atmosphere with a slightly bigger speed, but
which could be under 11 km/s. Couldn't it ?

Thank you in advance for your answers !
Clear skies to all for the Geminid display !
Karl



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