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Re: (meteorobs) NASA News articles
In a message dated 6/26/99 10:54:25 AM Eastern Daylight Time,
phillips@spacesciences.com writes:
<< Joe, in your 1998 Sky & Telescope article on
the Leonids there is a 2 dimensional scatter plot with "Distance of the
comet's orbit from Earth" on one axis and "Distance between comet's and
Earth's arrival time at node" on the other. It appears to show that there
were seven Leonid apparitions dating back to 934 when the Earth arrived at
the node less than 299 days after the comet. Of those, only 1965 and 1533
were major showers, and none rose to the level of "storm." >>
The scatter-plot was taken directly from Yeomans "classic" 1981 paper on the
Leonids, which was published in the journal Icarus (47, 492-499). In
addition, the data concerning the "Earth at the comet node" and the distance
separating the Earth's orbit from the comet -- as well as the assessment of
whether a particular display was considered a storm or a shower -- was also
taken from a table in that same Yeomans paper. A similar data table can be
found in "Handbook for Visual Meteor Observations" (1989) by the I.M.O.'s
Paul Roggemans.
-- joe rao
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