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Vs: Greenland Meteorite

Hello Mike and list,

Sad that they didnīt find any meteorites. I hope they have some luck with that
dust.

Mike is right. There is several meteor showers which meteors speed are more
than 35 miles (about 56km/s) per second;

alpha-Centaurids	56 km/s = 34.8 miles/s
gamma-Normids		56 km/s = -"-
eta-Aquarids		66 km/s = 41 miles/s
Pegasids		70 km/s = 43.5 miles/s
Perseids		59 km/s = 36.7 miles/s
alpha-Aurigids	66 km/s = 41 miles/s
delta-Aurigids	64 km/s = 39.8 miles/s
epsilon-Geminids	70 km/s = 43.5 miles/s
Orionids		66 km/s = 41 miles/s
Leonids		71 km/s = 44.1 miles/s
alpha-Monocerotids	65 km/s = 40.4 miles/s
sigma-Hydrids		58 km/s = 36 miles/s
Coma-Berenicids	65 km/s = 40.4 miles/s

I think that speed of Greenland meteorite is not very strong evidence for its
outside solar system origin. Greenland meteorite may have been a member of
sigma-Hydrids shower. Sigma-Hydrids is a small meteor shower (ZHR only 5)
which maximum date is December 12 and meteor speed 36 miles/second. This
shower was detected 1960s by photography... Radiant for that shower is
alpha=127 degree and delta=+2 degree (about 10 degree east of Procyon). It
would be a good idea to check if it is possible that Greenland event was
sigma-Hydrids originated. That would be a great news if there is dust from
meteor of known meteor shower... 

I found these meteors speeds from IMO Meteor Shower Calendar '99
<http://www.imo.net/calendar/cal99.html>

Jarmo

********************************
Jarmo Moilanen
Vattukuja 14 as 14
FIN-90460 Oulunsalo
FINLAND
e-mail: jarmom@netppl.fi
homepage: http://www.netppl.fi/~jarmom/index.htm
********************************

Mike wrote:

>     Reuters is reporting that the Danish Greenlan Meteorite expedition
> has ended without their finding any fragments from the fall last December.
> However, they returned with over 200 dust samples.  The scientists estimate
> that the meteoroid hit Earth's atmosphere at over 35 miles per second, 50
> percent fster that the speed of any known meteorite.  This led them to
speculate
> that the meteorite originated outside our solar system.
> 
>     I find this pretty thin evidence, as I believe several meteor showers
> have meteor speeds estimated well in excess of 35 miles per second,
> but I could be wrong.  They plan on analyzing the age of the dust particles
> to see if they are older than the solar system.  Because of its speed, they
> speculate the meteorite disintegrated upon entry and any large pieces
> may never be found.
> 
>     Of course, this is only speculation on their part, since they have yet
to
> positively identify the dust as meteoritic in origin. A ststus page can be
found
> 
> at     http://www.astro.ku.dk/tycho/tbe98/english/status/
> 
> Mike
> --
> "The avalanche has already started.
>      It is too late for the pebbles to vote."  Ambassador Kosh (Ver 1.0)
> --Believers--
> 
> Mike DiMuzio    mdimuzio@cisnet.com
> 
> 

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