[meteorite-list] OT: Pluto planet/planetoid

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From: Matson, Robert <ROBERT.D.MATSON_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:50 2004
Message-ID: <AF564D2B9D91D411B9FE00508BF1C86904EE5A82_at_US-Torrance.mail.saic.com>

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My 2 cents on the Pluto planet/planetoid debate:

There is one commonality shared by Mercury, Venus, Earth, Mars, Jupiter,
Saturn, Uranus and Neptune -- and NO other known solar system bodies.
They each represent more than 50% of the total mass of all other bodies
in a similar orbit. Note that Ceres would not be part of this group -- it
is
not more massive than the sum of all other asteroids in a similar orbit.
Pluto, likewise, would not meet this requirement -- like Ceres, it is the
largest body in its type of orbit, but the sum of the masses of all other
bodies in similar orbits exceeds that of Pluto.

The nice thing about this definition is that it is simple and unambiguous.

--Rob

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<DIV>My 2 cents on the
Pluto planet/planetoid debate:</DIV>
<DIV> </DIV>
<DIV>There is one
commonality shared by Mercury, Venus, Earth, Mars,
Jupiter,</DIV>
<DIV>Saturn, Uranus and Neptune
-- and NO other known solar system bodies.</DIV>
<DIV>They
each represent more than 50% of the
total mass of all other bodies</DIV>
<DIV>in a
similar
orbit.  Note that Ceres
would not be part of this group -- it
is</DIV>
<DIV>not
more
massive than the sum of all
other asteroids in a similar
orbit.</DIV>
<DIV>Pluto,
likewise, would not meet this
requirement -- like Ceres, it is
the</DIV>
<DIV>largest body in its
type of orbit, but the sum of the masses of all
other</DIV>
<DIV>bodies
in similar orbits exceeds that of
Pluto.</DIV>
<DIV> </DIV>
<DIV>The nice thing about this
definition is that it is simple and
unambiguous.</DIV>
<DIV> </DIV>
<DIV>--Rob</DIV>
<DIV> </DIV></BODY></HTML>

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Received on Tue 16 Mar 2004 01:26:36 PM PST

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