(meteorobs) Bolide size question

[Leo S.]

Hi Roberto,

Thanks for your answer, it seems I did under estimate the size in these 
type of events.

Best regards,
Leo


Roberto G. wrote:

> In general a bolid as full Moon (-12.6a) have 100 Kg of mass,
> a bolid of 17.6 should have, we have not valid statistic on this class
> of objects, a mass 100 biggest mass (10 Tn), an object of -20a
> should have 5-10 more mass (then 50-100 Tn).
> This usually, but there are tto many factors that can change this
> mass but the number that I wrote before (50-100 Tn) show
> the class where should be the object that fell the 25 July,
> we must remember too that usually a meteoroid when fell
> on our atmosphere has around 60 time more cinetic energy in mass that 
> the same weight in TNT then this bolid should
> display around 50-100 Tn x 60 = 3,000-6,000 Tn of TNT
> = 3-6 Kilotons of power, Hiroshima was 20 Kilotons.
> The 19 January 1993 fell in Northern Italy a bolid that
> esplosed at 30 Km in height, it was biggest of this, it
> was rekorded by 5 sismsic stations, 4 infrasound stations,
> it was saw from 400 Km of distance (in Cecoslovacchia),
> and by chance fell a night when all sk was clouded,
> because if it fell with good weather or in dautime it
> could do car accidents or other fatality, it esploxed
> a 30 Km and it should too destroy the ozone layer
> for a certain time.
>
>> From this bolid now I remember that we prepare
>
> for possible following bolid of the same class, it's
> an idea of Korado Korlevic: in the day following
> the dust of this bolid was dispersed in near half Europe,
> the it's very important that many trap with adesive
> surface are place in site with no industrial dusts,
> the in the next day/wekk the dust of this bolid (25 July) shall be 
> captured by this adesive surface.
>
>> Secondly, assuming a stony or iron composition, and an entry angle of 
>> 45 degrees for sake of argument, what would be the approximate 
>> cut-off point in terms of diameter for meteoroids to retain cosmic 
>> velocity all the way down to the ground?
>
>
> It's not a diameter but the mass, it's around 100 Tn, in this case
> a residual cosmic speed of 2-3 Km/sec can to be conserved.
>
>>
>> Best regards,
>> Leo
>
>
> Best greetings.
> Roberto Gorelli