(meteorobs) Re: Meteor picture from Mars?

Ed Majden epmajden at shaw.ca
Sat Jun 11 21:22:51 EDT 2005


on 6/11/05 16:50, Marco Langbroek at marco.langbroek at wanadoo.nl wrote:

> 
> 
> Pavol Habuda wrote:
>> 1. Entry velocities on Mars are in range from 5 up to 55 km/s.
>> Lower end is caused escape velocity from planet, upper velocity
>> of body on parabolic orbit strikes Mars directly head on
>> (body is coming from apex).
> 
> Interestingly, the lower end of this range (5 km/s) is close to the value for
> the onset of dark flight with meteorites, and clearly below the point
> (velocity 
> <10-12 km/s) where luminosity, if any at all, is mainly due to deceleration
> and 
> not so much to ablation.

Hello Marco:

    That's something I did not consider!  I wonder if there are any
statistics on meteoroids entering at the low end or escape velocity range
for Earth?  I would think that this would not be common place and most
velocities would be higher than this.  I will have to look at Halliday's
MORP statistics published in MAPS to see if any come close to the low end
range.

Ed Majden



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