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Definition of a Planet
How to categorize every object in
our solar system
Period 4, Group 4
Diameter of Planets and
Dwarf Planets
Diameter of Planets and Dwarf Planets
160000.0
140000.0
Value of Diameter (km)
120000.0
100000.0
80000.0
60000.0
40000.0
20000.0
0.0
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Name of Planet or Dw arf Planet
Ceres
Pluto
Haumea
Makemake
Eris
Smallest Mass Planets
Smallest Mass Planets
1.20000
Value of Mass (Earth=1)
1.00000
0.80000
0.60000
0.40000
0.20000
0.00000
Mercury
Venus
Earth
Planet
Mars
Largest Mass Planets
Largest Mass Planets
350.00000
300.00000
Value of Mass (Earth=1)
250.00000
200.00000
150.00000
100.00000
50.00000
0.00000
Jupiter
Saturn
Uranus
Planet
Neptune
Mass of Dwarf Planets
Mass of Dwarf Planets
0.00300
Value of Mass (Earth=1)
0.00250
0.00200
0.00150
0.00100
0.00050
0.00000
Ceres
Pluto
Haumea
Dwarf Planet
Makemake
Eris
Orbital Eccentricity
Orbital Eccentricity of Planets and Dwarf Planets
0.500
0.450
0.400
0.300
0.250
.
0.200
0.150
0.100
0.050
M
Planets and Dwarf Planets
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M
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V
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0.000
M
Orbital Eccentricity (e)
0.350
Planets with Shortest
Rotation Period
Rotation Period
7.000
6.000
Rotation Period (Earth Days)
5.000
4.000
3.000
2.000
1.000
0.000
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Ceres
Planets and Dwarf Planets
Pluto
Huamea
Makemake
Eris
Planets with Longest
Rotation Period
Rotation Period
300.000
Rotation Period (Earth Days)
250.000
200.000
150.000
100.000
50.000
0.000
Mercury
Venus
Planets
Orbital Period
Planets Orbital Period
600.000
500.000
300.000
200.000
100.000
M
Planets and Dwarf Planets
ris
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H
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P
C
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N
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U
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ur
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S
Ju
pi
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r
ar
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M
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th
E
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V
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0.000
M
Orbital Period
400.000
Inclination of Orbit
Inclination of Orbit
50.000
45.000
40.000
Inclination in Degrees
35.000
30.000
25.000
20.000
15.000
10.000
5.000
0.000
Planets and Dwarf Planets
IAU

The IAU has created definitions that have stated traits
that Planets, Dwarf Planets, and Small Solar System
Bodies should contain.
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These definitions, however, have been proven wrong
on many levels.
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The definitions we created are to eliminate any
confusion on the topic of these objects in space.
IAU Definition
The IAU resolves that planets and other bodies in our Solar System
be defined into three distinct categories in the following way:

1) A planet is a celestial body that (a) is in orbit around the Sun, (b)
has sufficient mass for its self-gravity to overcome rigid body forces
so that it assumes a hydrostatic equilibrium (nearly round) shape, (c)
has cleared the neighborhood around its orbit.

2) A dwarf planet is a celestial body that (a) is in orbit around the
Sun, (b) has sufficient mass for its self-gravity to overcome body
forces so that it assumes a hydrostatic equilibrium (nearly round)
shape, (c) has not cleared the neighborhood around its orbit, and (d)
is not a satellite [of a planet].
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3) All other objects orbiting the Sun shall be referred to collectively
as Small Solar System Bodies.
Definition of a Planet
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- A planet is a celestial body that must have the following
criteria:
Must lie within space
Must orbit the sun
Must clear its own neighborhood
Must be composed of an atmosphere
Diameter must be greater than or equal to 4,000 km
Must have a mass of at least 0.5 (Earth=1)
Must be spherical
Definition of a Planet
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Must rotate in either direction (Right or Left)
The number of moons a planet has is irrelevant
The number of rings/belts a planet has is irrelevant
Orbital period must be under 200 Earth days (Planet will have
to be close to the sun)
Orbital inclination must be under 10º
Must have an orbital eccentricity at or below 0.150 (e)
Mean orbital velocity must be greater than 6.0 km/sec
Mean temperature can have a minimum of -200º C and a
maximum of 500º C
Definition of a
Dwarf Planet
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-A Dwarf Planet is a celestial body that must have the
following criteria:
Must lie within space
Must orbit around the sun
Does not clear its own neighborhood
Must have a diameter below 4,000 km
Must have a mass less than 0.5 (Earth=1)
Must be spherical
Must have an orbital eccentricity below 0.150 (e)
Definition of a
Dwarf Planet
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Must rotate in either direction (Right or Left)
Number of moons is irrelevant
Must not have rings
Orbital period must be greater than 200 Earth days
Orbital inclination must be greater than 10º
Must have an orbital eccentricity above 0.150 (e)
Mean orbital velocity must be less than 9.0 km/s
Mean temperature can have a minimum -300º C and a
maximum of -100º C
Definition of a
Celestial Body
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Must lie within space
Does not have to have an atmosphere
Does not fit into the categories of planets or dwarf planets
Can orbit another object in space
Examples of celestial bodies are: Stars (Sun), comets,
asteroids, meteorites, brown dwarves, etc.
How is Each Space Object Categorized?
Name of Each Object
Category They Fall Into
Mercury
Planet
Venus
Planet
Earth
Planet
Mars
Planet
Jupiter
Planet
Saturn
Planet
Uranus
Planet
Neptune
Celestial body
Ceres
Dwarf planet
Pluto
Dwarf planet
Haumea
Dwarf planet
Makemake
Dwarf planet
Eris
Dwarf planet
Stars (Sun)
Celestial body
Asteroids
Celestial body
Comets
Celestial body
Brown Dwarves
Celestial body
Meteorites
Celestial body
Thank You Very Much!
Definitions By:
Rachel Kester
Courtney Linaker
Hailey Sawchuk
Period 4, Group 4