[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 ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list at meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list Received on Tue 23 Aug 2011 05:31:37 PM PDT |
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