Planet Designer

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

Day Length:	hours (2.5 seems to be the lower limit for asteroids, 10 to 24 is typical, more for tidally locked bodies)
Mass:	relative to Earths
Density:	g/cm3 (0.6 to 6 is the normal range, solid iron is 7.8)

Diameter =	km
Surface Area =	million square km
Roche Limit =	km (nearest possible natural satelite)
Surface Gravity =	Gs
To Orbit Velocity =	km per second
Thrust to orbit time at 3G =	minutes
Escape Velocity =	km per second
-
Geosynchronous orbital distance =	km, or miles (from surface of planet)
Geosynchronous orbital velocity =	km/s , or miles per second

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

Carbon Dioxide?	°C
Oxygen?	°C
Helium?	°C
Hydrogen?	°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.

Home