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PLANET CLASSES
SIZE CLASS
Planet Size Classes are subject to change as new astronomical data is acquired.
/ Stars & Planets / Planet Class / Size Class
Super Jovian Size
318 Earth Masses - 13 Jupiter Masses
10-15 Earth Diameters
Ultra Thick Atmosphere
No Surface
Rock & Metal Core
Extreme Gravity
Not Habitable
Example is Jupiter
Jovian Size
51 Earth Masses - 0.99 Jupiter Masses
4.01 - 9.99 Earth Diameters
Ultra Thick Atmosphere
No Surface
Rock & Metal Core
Moderate to Extreme Gravity
Not Habitable
Example is Saturn
Neptunian Size
10-50 Earth Masses
3-4 Earth Diameters
Very Thick Atmosphere
No Surface
Rock & Ice Core
Moderate to Extreme Gravity
Not Habitable
Example is Uranus, Neptune
Sub Neptunian Size
2.1-9.99 Earth Masses
1.26-2.99 Earth Diameters
Thick Atmosphere
No Surface
Rock & Ice Core
Moderate to Extreme Gravity
Not Habitable
No Planet Example
Super Terran Size
1.26-2.00 Earth Masses
1.03-1.25 Earth Diameters
Significant Atmosphere
Rocky Surface
Iron/Nickel Core, Silicon Crust
Moderate to High Gravity
Could be Habitable
No Planet Example
Terran Size
0.51-1.25 Earth Masses
0.80-1.02 Earth Diameters
Significant Atmosphere
Rocky Surface
Iron/Nickel Core, Silicon Crust
Moderate Gravity
Could be Habitable
Example is Earth, Venus
Sub Terran Size
0.11-0.50 Earth Masses
0.50-0.79 Earth Diameters
Thin Atmosphere
Rocky Surface
Iron/Nickel Core, Silicon Crust
Weak Gravity
Could be Habitable
Example is Mars
Mercurian Size
0.006-0.10 Earth Masses
0.21-0.49 Earth Diameters
Very Thin or No Atmosphere
Rocky Surface
Iron/Nickel Core, Silicon Crust
Weak Gravity
Not Habitable
Example is Mercury
Plutonian Size
0.000166-0.005 Earth Masses
0.081-0.20 Earth Diameters
Very Thin or No Atmosphere
Rocky Surface
Rock/Metal Core, Ice Crust
Weak Gravity
Not Habitable
Example is Pluto
Asteroidan Size
0.00015 or less Earth Masses
0.080 or less Earth Diameters
No Atmosphere
Rocky Surface
Iron/Nickel Rock, Chrondrites
Weak Gravity
Not Habitable
Example is Vesta
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