Planet Designer

Generate realistic planetary data derived from the planet's day length and two of: mass, density and radius. Enter the desired values and press calculate or just hit one of the other buttons.

hours (2.5 seems to be the lower limit for asteroids, 10 to 24 is typical, more for tidally locked bodies)
relative to Earths
relative to Earths
relative to Earths
Use Mass and Density? Use Mass and Radius? Use Density and Radius?


g/cm3
g/cm3
g/cm3

km
g/cm3
million square km
km (nearest possible natural satelite)
Gs
km per second
minutes
km per second
-
km, or (from surface of planet)
km/s , or

Maximum surface* temperature to hold onto an atmospheric component for billions of years, for each type of gas:

°C
°C
°C
°C

* More properly it should be Thermosphere temperature (look it up), which for Earth gets as high as 2000 C


Suggestions for improvement? Ideas for new calculators? Problems with this page? E-mail me.

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