Die abschließende Testabstimmung brachte folgendes Ergebnis:
RES 5: 70% Nein
RES 6: 80% Nein
RES 7: 80% Nein
Modified IAU draft for the Resolution 5 , Planet Definition
Prague, August 22nd, 12h30 , Copied from handout at the
Auditorium
IAU Resolution: Definition of a Planet
Contemporary observations are changing our understanding of
planetary systems, and it is important that our nomenclature
for
objects reflects our current understanding. This applies, in
particular to the designation 'planets'. The word 'planet'
originally
described 'wanderers' that were known only as moving lights
in the sky.
Recent discoveries lead us to create a new definition, which
we can
make using currently available scientific information. (Here
we are
not concerned with the upper boundary between 'planet' and
'star',
nor the distinction between stars and brown dwarfs).
RESOLUTION 5 (draft)
The IAU therefore resolves that planets and other bodies in
the planetary
systems be defined in the following way:
(1) A planet is a celestial body that (a) has sufficient
mass for its self-
gravity to overcome rigid body forces so that is assumes a
hydrostatic
equilibrium (nearly round) shape[1], and (b) is in orbit
around a star, and
is neither a star or a satellite of a planet.
(2) In our Solar System we distinguish between the eight
"classical planets",
as the dominant objects in their local population zones, and
"dwarf planets",
which are not.
(3) All natural non-planet objects orbiting the Sun,
currently
includind most of the Solar System asteroids, near-Earth
objects (NEOs),
Mars-, Jupiter-, Neptune-Trojan asteroids, most Centaurs,
most
Trans-Neptunian Objects (TNOs), and comets, shall be referred
to collectively as "Small Solar System Bodies". In the new
nomenclature the term "minor planet" is not used.
[1] This generally applies to objects with mass above 5 x
10^20 kg and diameter
greater than 800 km. An IAU process will be established to
evaluate planet
candidates near this boundary.
RESOLUTION 6 (draft)
The IAU further resolves:
Pluto is a dwarf planet by the above scientific definition,
as are one or
more recently discovered large trans-Neptunian objects. In
contrast to
the classical planets, these objects have orbital periods in
excess of 200
years and typically have highlx inclined orbits with large
eccentricities. We
designate this category of planetary objects, of which Pluto
is the prototype,
as a new class that we call 'XXXXX'. We propose that the MPC
create an new
and separate catalog for these objects and their orbital
characteristics, with
Pluto as the first entry.