[meteorite-list] Annual Influx Rate and Average Velocity

From: al mitt <almitt_at_meteoritecentral.com>
Date: Tue, 23 Aug 2011 17:31:37 -0400
Message-ID: <5DF7420E1B4E46449A143544D0100BB2_at_StarmanPC>

Hi Robert and all,

I think it is John G. Burke in his book Cosmic Debris that has a chart that
shows influx and a pretty broad scale. The scale shows Impacts that occur. A
1 micron diameter object collides every microseconds, a 1 mm diameter every
30 seconds, a 1 meter diameter every year, a 100 meter diameter every 10,000
years and a 10 km diameter every 100,000,000 years. I know that is pretty
broad for what you want.

There was also a Canadian Study done a few years back. Think they figured
10,000 objects over 100 grams influx. Over 3/4 of those hit water. About
3,000 hit land in a years time in the 100 gram range.

As for speeds, depending if the Earth is traveling into a stream or if the
stream is catching up would give a drastic variation in collisions speeds.
The ones that tend to catch up survive most often.

Perhaps others can chime in on this and help out further.

--AL Mitterling


----- Original Message -----
From: "Robert Beauford" <robertbeauford at rocketmail.com>
To: <meteorite-list at meteoritecentral.com>
Sent: Tuesday, August 23, 2011 4:22 PM
Subject: [meteorite-list] Annual Influx Rate and Average Velocity


I need a decent estimate of average annual meteorite influx rate (total mass
at all scales per year) and I'm not sure who has done the best and most
recent job.
Can anyone suggest a source?
Also, does anyone have any idea whether anyone has worked out a meaningful
average speed (from real data) for inbound objects?
I suspect that everything from pebble size to large masses have one average
velocity and that dust has a different average velocity.
Any insights would be greatly appreciated.
Thanks,
Robert Beauford
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Received on Tue 23 Aug 2011 05:31:37 PM PDT