(meteorobs) Expect some debris over the next few years...

[Leo S]

I think it was about 7.5 km/s.

According to this simulation posted on spaceweather.com, their relative 
speed was 11.6 km/s:
http://www.spaceweather.com/swpod2009/12feb09/IridiumCosmosMovie2.wmv?PHPSESSID=1lnk3enfasnkg5cthq5qgj0ik7
http://tinyurl.com/aoac5n

Leo

Matt Mundorf wrote:
> Does anyone know how fast these two satellites were orbiting at ?  It
> makes me wonder if they just shattered into small pieces upon impact or
> if there are large parts of them spread out now.
>
>
> Thanks,
> Matt
>
> -----Original Message-----
> From: meteorobs-bounces at meteorobs.org
> [mailto:meteorobs-bounces at meteorobs.org] On Behalf Of Chris Peterson
> Sent: Thursday, February 12, 2009 12:43 PM
> To: Global Meteor Observing Forum
> Subject: Re: (meteorobs) Expect some debris over the next few years...
>
> Hi Marco-
>
> While the moderate altitude means that debris will persist for decades,
> it 
> doesn't mean we can't expect decays. The STK analysis of the FENGYUN 
> incident, if applied to this collision, would suggest that we can expect
>
> around 10kg of material per year for the next decade or so, falling off 
> somewhat after that. Presumably most of the debris is small, but 
> sub-kilogram material reentering at low velocity (<8 km/s) is perfectly 
> capable of producing nice fireballs. And the rate can be expected to 
> increase somewhat as we approach solar max, and the effects of drag
> become 
> greater.
>
> Chris
>
> *****************************************
> Chris L Peterson
> Cloudbait Observatory
> http://www.cloudbait.com
>
>
> ----- Original Message ----- 
> From: "Marco Langbroek" <marco.langbroek at wanadoo.nl>
> To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
> Sent: Wednesday, February 11, 2009 5:08 PM
> Subject: Re: (meteorobs) Expect some debris over the next few years...
>
>
>   
>> As this happened at 788 km (490 mile) altitude, the debris will remain
>>     
> in 
>   
>> orbit
>> for a very long time. No decays to be expected from this collision 
>> therefore.
>>
>> The collision was between Iridium 33 and Kosmos 2251 and happened at
>>     
> 16:56 
>   
>> UTC
>> (11 Feb), near 98.156 E, 72.462 N, 788.58 km altitude.
>>
>> - Marco
>>     
>
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